Segui questo link per vedere altri tipi di pubblicazioni sul tema: Global positon system.
Tesi sul tema "Global positon system"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Vedi i top-50 saggi (tesi di laurea o di dottorato) per l'attività di ricerca sul tema "Global positon system".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Vedi le tesi di molte aree scientifiche e compila una bibliografia corretta.
1
Chan, Francis Chun Ngai Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Statistical methods on detecting superpositional signals in a wireless channel." Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/30596.
Testo completoAbstract (sommario):
The objective of the thesis is concerned on the problem of detecting superpositional signals in a wireless channel. In many wireless systems, an observed signal is commonly represented as a linear combination of the transmitted signal with the interfering signals dispersed in space and time. These systems are generally known as the interference-limited systems. The mathematical model of these systems is generally referred as a superpositional model. A distinguished characteristic of signal transmission in a time-varying wireless channel is that the channel process is not known a priori. Reliable signal reception inherently requires exploiting the structure of the interfering signals under channel uncertainty. Our goal is to design computational efficient receivers for various interference-limited systems by using advanced statistical signal processing techniques. The thesis consists of four main parts. Firstly, we have proposed a novel Multi-Input Multi-Output (MIMO) signal detector, known as the neighbourhood exploring detector (NED). According to the maximum likelihood principle, the space time MIMO detection problem is equivalent to a NP-hard combinatorial optimization problem. The proposed detector is a sub-optimal maximum likelihood detector which eliminates exhaustive multidimensional searches. Secondly, we address the problem of signal synchronization for Global Positioning System (GPS) in a multipath environment. The problem of multipath mitigation constitutes a joint estimation of the unknown amplitudes, phases and time delays of the linearly combined signals. The complexity of the nonlinear joint estimation problem increases exponentially with the number of signals. We have proposed two robust GPS code acquisition systems with low complexities. Thirdly, we deal with the problem of multipath mitigation in the spatial domain. A GPS receiver integrated with the Inertial Navigation System (INS) and a multiple antenna array is considered. We have designed a software based GPS receiver which effectively estimates the directions of arrival and the time of arrival of the linearly combined signals. Finally, the problem of communications with unknown channel state information is investigated. Conventionally, the information theoretical communication problem and the channel estimation problem are decoupled. However the training sequence, which facilitates the estimation of the channel, reduces the throughput of the channel. We have analytically derived the optimal length of the training sequence which maximizes the mutual information in a block fading channel.
2
Scott-Young, Stephen. "Integrated position and attitude determination for augmented reality systems /." Connect, 2004. http://eprints.unimelb.edu.au/archive/00000827.
Testo completo
3
Deckert, Christopher J. "Canopy, terrain, and distance effects on Global Positioning System position accuracy." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09052009-040816/.
Testo completo
4
Langdorf, Kim Alldredge. "A position-location system utilizing geosynchronous communication satellites." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40226.
Testo completoAbstract (sommario):
This dissertation describes a novel method of providing position-location from geosynchronous communication satellites. The Global Positioning System (GPS) has become the standard for position-location and navigation in the world. It provides extremely accurate coordinates to military users and slightly less accurate coordinates to "non-authorized" users. Disadvantages of GPS are complexity and high cost. The U.S. Department of Defense (DoD) has spent billions of dollars in developing and fielding the system. Maintenance and GPS satellite replenishment costs will continue to climb.
A simpler, lower cost alternative to the GPS system is explored. This study describes a position-location system using transponders on-board geosynchronous communication satellites. The system uses three geosynchronous communication satellites at a time to relay synchronized television signals. The signals provide a timing system to measure the ranges from the satellites to the receiver. The least squares method is used to calculate the location of the receiver.
A software model is developed to demonstrate the ability of the system to "track" three geosynchronous satellites and calculate receiver position. A test is conducted to demonstrate the use of television signals to provide timing for the system. The basic model is further refined by adding perturbation forces which act on the satellites. The Intelsat Eleven-Parameter algorithm is incorporated into the systenl model and provided the most precise location of the satellites. The accuracy of the proposed system in determining the position-location of the receiver is estimated based on the results of the simulation and the test. Further research is proposed to build on the concepts discussed in this dissertation.<br>Ph. D.
5
Öhresten, Daniel. "ECO-Tracks: Ökad Information med Globalt Positions System (GPS)." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185267.
Testo completoAbstract (sommario):
In this project a prototype that uses GPS for information gathering is created, the prototype gathers positional information and logs this on an SD-card. The gathered information can later be used with the help of “Google maps” and their API to show where the GPS module has been during its usage, the prototype is battery driven and has a battery life that is slightly longer than one month. To use the gathered information a Python script has been created that generates an HTML file to easily show where the prototype has been and gives an approximate value of the traveled distance. Everything that is necessary for the Python script to work is stored on the SD-card. In this project a design for a protective casing for the prototype has been produced, a theoretically good material that can be used to create the protective casing has also been presented. The biggest obstacle for this prototype is the signal loss produced with sub optimal environments like cities with a lot of tall buildings and forests with tall trees that limits the view to the sky.<br>I detta arbete har en prototyp som använder GPS för att hämta information skapats, prototypen hämtar platsinformation och lagrar detta på ett SD-kort. Den inhämtade informationen kan sedan användas tillsammans med ”Google maps” och deras API för att visa vart prototypen har varit under dess användning, prototypen är batteridriven och har en batteritid på lite längre än en månad. För att använda den inhämtade informationenså har ett Python skript skapats som genererar en HTML fil för att enkelt visa vart prototypen har varitsamt att det ger en ungefärlig distans som prototypen har färdats. Allt som behövs för Python skriptet är lagrat på SD-kortet.Under arbetet har även en design av en skyddslåda för prototypen tagits fram, dessutomhar ett teoretiskt bra materialatt skapa denna skyddslåda presenterats.Det största hindret för prototypen är den möjliga signalförlusten då omgivningen inte är optimal, vilket är i städer med höga byggnader och skog med mycket träd som skymmer sikten till himlen.
6
Biskaduros, Zachary Jon. "Collaborative Localization Enhancement to the Global Positioning System using Inter-Receiver Range Measurements." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23152.
Testo completoAbstract (sommario):
The localization of wireless devices, e.g. mobile phones, laptops, and handheld GPS receivers, has gained much interest due to the benefits it provides, including quicker emergency personnel dispatch, location-aided routing, as well as commercial revenue opportunities through location based services. GPS is the dominant position location system in operation, with 31 operational satellites producing eight line of sight satellites available to users at all times making it very favorable for system implementation in all wireless networks. Unfortunately when a GPS receiver is in a challenging environment, such as an urban or indoor scenario, the signal quality often degrades causing poor accuracy in the position estimate or failure to localize altogether due to satellite availability. <br /> <br />Our goal is to introduce a new solution that has the ability to overcome this limitation by improving the accuracy and availability of a GPS receiver when in a challenging environment. To test this theory we created a simulated GPS receiver using a MATLAB simulation to mimic a standard GPS receiver with all 31 operational satellites. Here we are able to alter the environment of the user and examine the errors that occur due to noise and limited satellite availability. Then we introduce additional user(s) to the GPS solution with the knowledge (or estimate) of the distances between the users. The new solutions use inter-receiver distances along with pseudoranges to cooperatively determine all receiver location estimates simultaneously, resulting in improvement in both the accuracy of the position estimate and availability.<br>Master of Science
7
Aab, Steven D. "Performance Analysis of the Local Area Augmentation System as the Position Sensor for the Runway Incursion Prevention System." Ohio University / OhioLINK, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1121182284.
Testo completo
8
Meyer, Steven J. "TIME, SPACE, POSITION INFORMATION UNIT MESSAGE STRUCTURE OVERVIEW." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/607515.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California<br>The Joint Advanced Missile Instrumentation (JAMI) program is developing a Time, Space, and Position Information (TSPI) unit for high dynamic missile platforms by employing the use of Global Position System (GPS) and inertial sensors. The GPS data is uncoupled from the inertial data. The output of the JAMI TSPI unit follows the packet telemetry protocol and is called the TSPI unit message structure (TUMS). The packet format allows the data stream to stand on its own, be integrated into a packet telemetry system or be an asynchronous data channel in a PCM data stream. On the ground, the JAMI data processor (JDP) Kalman filters the GPS and inertial data to provide a real time TSPI solution to the ranges for display. This paper gives an overview of the message format, the timing relationships between the GPS data and inertial data, and how TUMS is to be handled by the telemetry receiving site to hand it off to the JDP.
9
Xingyu, Luo, and Zhang Qishan. "A PARALLEL -SEQUENTIAL SEARCH ALGORITHM IN A HIGH DYNAMIC GPS RECEIVER." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/607533.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California<br>It is need to design acquisition and tracking for code loop and carrier loop to detect the high dynamic Global Position System (GPS) signal. Acquiring signal quickly and shortening acquisition time in the cold case are key technology of a high dynamic GPS receiver. Moreover, fast acquisition of C/A code is the base of code tracking and carrier acquisition and tracking. This paper describes elements and implementation of a new parallel-sequential search Algorithm to acquire C/A code of the high dynamic GPS signal. And combined with a 12-channel correlator named GP2021 produced by GEC Co., the arithmetic implementation to acquire C/A code of the high dynamic GPS signal used sequential search based on DSP technology is also given.
10
Vickery, John Lawrence. "AN INTELLIGENT DIFFERENCING GLOBAL POSITIONING SYSTEM UTILIZING DIFFERENTIAL DOPPLER TO DETERMINE POSITION AND SPEED ACCURATELY." MSSTATE, 2002. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03012002-121541/.
Testo completoAbstract (sommario):
It is not where in the world you are that matters. It is where you are with respect to a reference point whether on land or at sea. That is the basis behind Differencing GPS. Utilizing the carrier wave and Gold Code (GC) signal transmitted by GPS satellites, this project uses two GPS receivers and a system integration manager utilizing neural networks and expert systems to determine a user position and speed relative to a fixed point on earth. Two methods of determining the user position are employed: classic triangulation and measuring the difference in the Doppler shift of the carrier wave between the user and the reference receiver. The idea is for the user to know where they are in relationship to a designated fixed point and navigate with respect to that fixed point. The user could range from a farmer or an aircraft out at sea attempting to land on the deck of a carrier.
11
Kassan, Mark W. "Distributed Interactive Simulation: The Answer to Interoperable Test and Training Instrumentation." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611445.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California<br>This paper discusses Global Positioning System (GPS) Range Applications Joint Program Office (RAJPO) efforts to foster interoperability between airborne instrumentation, virtual simulators, and constructive simulations using Distributed Interactive Simulation (DIS). In the past, the testing and training communities developed separate airborne instrumentation systems primarily because available technology couldn't encompass both communities' requirements. As budgets get smaller, as requirements merge, and as technology advances, the separate systems can be used interoperably and possibly merged to meet common requirements. Using DIS to bridge the gap between the RAJPO test instrumentation system and the Air Combat Maneuvering Instrumentation (ACMI) training systems provides a defacto system-level interoperable interface while giving both communities the added benefits of interaction with the modeling and simulation world. The RAJPO leads the test community in using DIS. RAJPO instrumentation has already supported training exercises such as Roving Sands 95, Warfighter 95, and Combat Synthetic Test, Training, and Assessment Range (STTAR) and major tests such as the Joint Advanced Distributed Simulation (JADS) Joint Test and Evaluation (JT&E) program. Future efforts may include support of Warrior Flag 97 and upgrading the Nellis No-Drop Bomb Scoring Ranges. These exercises, combining the use of DIS and RAJPO instrumentation to date, demonstrate how a single airborne system can be used successfully to support both test and training requirements. The Air Combat Training System (ACTS) Program plans to build interoperability through DIS into existing and future ACMI systems. The RAJPO is committed to fostering interoperable airborne instrumentation systems as well as interfaces to virtual and constructive systems in the modeling and simulation world. This interoperability will provide a highly realistic combat training and test synthetic environment enhancing the military's ability to train its warfighters and test its advanced weapon systems.
12
Abdelmajid, Nabih T. "Innovative Location Based Scheme for Internet Security Protocol. A proposed Location Based Scheme N-Kerberos Security Protocol Using Intelligent Logic of Believes, Particularly by Modified BAN Logic." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5270.
Testo completoAbstract (sommario):
The importance of the data authentication has resulted in the science of the data protection. Interest in this knowledge has been growing due to the increase in privacy of the user's identity, especially after the widespread use of online transactions. Many security techniques are available to maintain the privacy of the user's identity. These include password, smart card or token and face recognition or finger print. But unfortunately, the possibility to duplicate the identity of a user is still possible. Recently, specialists used the user's physical location as a new factor in order to increase the strength of the verification of the user's identity. This thesis focused on the authentication-based user's location. It is based on the idea of using the Global Position System in order to verify the user identity. Improving Kerberos protocol using GPS signal is proposed in order to eliminate the effect of replay attack. This proposal does not expect a high performance from the user during the implementation of the security system. Moreover, to give users more confidence to use security protocol, it has to be evaluated before accepting it. Thus, a measurement tool used to validate protocols called BAN logic was described. In this thesis, a new form of BAN logic which aims to raise the efficiency checking process of the protocol protection strength using the GPS signal is proposed. The proposed form of Kerberos protocol has been analysed using the new form of BAN logic. The new scheme has been tested and compared with the existing techniques to demonstrate its merits and capabilities.
13
Bochuan, Zhang, Kou Yanhong, Zhang Qishan, and Chang Qing. "DESIGN OF A HIGH DYNAMIC GPS RECEIVER." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605033.
Testo completoAbstract (sommario):
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>High dynamic and multi-channel digital GPS receiver can handle the signals with high dynamic range, low S/N ratio and refresh data quickly. A hardware design of high dynamic GPS digital receiver is given. Based on analysis of the effect that high dynamic movement makes on the receiving signals, a scheme of fast-acquisition high dynamic GPS receiver is presented. Exact reckoning of the orbit parameters and the satellite clock parameters are integrated with appropriate algorithms. A DDLL is used to precisely estimate the C/A code delay, a CPAFC loop and a Costas loop to precisely estimate the carrier frequency and phase. The DDLL is assisted with carrier phase. The experimental results show that the receiver meets the design request.
14
Kuratomi, Alejandro. "GNSS Position Error Estimated by Machine Learning Techniques with Environmental Information Input." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262692.
Testo completoAbstract (sommario):
In Intelligent Transport Systems (ITS), specifically in autonomous driving operations, accurate vehicle localization is essential for safe operations. The localization accuracy depends on both position and positioning error estimates. Technologies aiming to improve positioning error estimation are required and are currently being researched. This project has investigated machine learning algorithms applied to positioning error estimation by assessing relevant information obtained from a GNSS receiver and adding environmental information coming from a camera mounted on a radio controlled vehicle testing platform. The research was done in two stages. The first stage consists of the machine learning algorithms training and testing on existing GNSS data coming from Waysure´s data base from tests ran in 2016, which did not consider the environment surrounding the GNSS receiver used during the tests. The second stage consists of the machine learning algorithms training and testing on GNSS data coming from new test runs carried on May 2019, which include the environment surrounding the GNSS receiver used. The results of both stages are compared. The relevant features are obtained as a result of the machine learning decision trees algorithm and are presented. This report concludes that there is no statistical evidence indicating that the tested environmental input from the camera could improve positioning error estimation accuracy with the built machine learning models.<br>Inom Intelligenta transportsystem (ITS), specifikt för självkörande fordon, så är en exakt fordonspositionering en nödvändighet för ökad trafiksäkerhet. Positionsnoggrannheten beror på estimering av både positionen samt positionsfelet. Olika tekniker och tillämpningar som siktar på att förbättra positionsfeluppskattningen behövs, vilket det nu forskas kring. Denna uppsats undersöker olika maskininlärningsalgoritmer inriktade på estimering av positionsfel. Algoritmerna utvärderar relevant information från en GNSS-mottagare, samt information från en kamera om den kringliggande miljön. En GNSS-mottagare och kamera monterades på en radiostyrd mobil testplattform för insamling av data. Examensarbetet består av två delar. Första delen innehåller träning och testning av valda maskininlärningsalgoritmer med GNSS-data tillhandahållen av Waysure från tester gjorda under 2016. Denna data inkluderar ingen information från den omkringliggande miljön runt GNSS-mottagaren. Andra delen består av träning och testning av valda maskininlärningsalgoritmer på GNSS-data som kommer från nya tester gjorda under maj 2019, vilka inkluderar miljöinformation runt GNSS-mottagaren. Resultaten från båda delar analyseras. De viktigaste egenskaper som erhålls från en trädbaserad modell, algoritmens beslutsträd, presenteras. Slutsatsen från denna rapport är att det inte går att statistiskt säkerställa att inkludering av information från den omkringliggande miljön från en kamera förbättrar noggrannheten vid estimering av positionsfelet med de valda maskininlärningsmodellerna.
15
Hoefener, Carl E. "GPS: THE LOGICAL TOOL FOR PRECISION TRACKING IN SPACE." International Foundation for Telemetering, 1991. http://hdl.handle.net/10150/613092.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>As we develop more space vehicles, a pressing requirement emerges to provide precision tracking information. This need for exact time and space-position information (TSPI) persists whether developing and testing space weapons or locating the precise position of intelligence-gathering satellites. Because this is a worldwide tracking requirement, the use of conventional tracking techniques such as radar is precluded. Fortunately the Global Positioning System (GPS) is now in place and can provide the tracking information required. GPS offers two techniques for tracking space vehicles. A GPS receiver can be installed on the vehicle to determine the position that is then relayed to a ground terminal, or a GPS frequency translator can be used to compute the vehicle position at the master groundsite. Since both techniques have been proven satisfactory, the specific tracking requirement determines the method selected.
For the flight tests of the Exoatmospheric Reentry-Vehicle Interceptor Subsystem (ERIS), the GPS frequency translator technique is used. A GPS frequency translator is installed on the target (a reentry-vehicle launched on a Minuteman from Vandenberg), and a translator is also installed on the ERIS, which is launched from Meck Island in the Kwajalein Atoll. The GPS frequency translator approach was chosen for these tests for a variety of reasons, the most important of which were the limited instrumentation space on the target and interceptor, the extreme dynamics of the interceptor, the tracking accuracy required, and the range at which the operation must be tracked.
For the tracking of orbiting satellites, a GPS receiver can be flown on the satellite with its derived position information continuously stored. This data can then be dumped as the satellite passes over a selected groundsite.
16
Oliveira, Marcos Almir de. "Compatibilização de dados, em diferentes referenciais, para atualização cartográfica: estudo de caso na SABESP." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-11072007-193350/.
Testo completoAbstract (sommario):
Um dos propósitos deste trabalho foi apresentar a metodologia envolvida na estimação de parâmetros de transformação entre dois Sistemas Geodésicos, em função da implantação do Sistema de Informações Geográficas no Saneamento (SIGNOS) pela SABESP. Este estudo foi desenvolvido no Município de São Paulo, onde foram calculados parâmetros de transformação entre os Sistemas SAD-69 (South American Datum 1969) e Córrego Alegre. Os parâmetros obtidos neste estudo foram comparados com os parâmetros disponíveis atualmente. Outro estudo, deste trabalho, é a proposta para compatibilização do sistema altimétrico da SABESP. O sistema atual é formado por diversas redes altimétricas (IBGE, SABESP, EMPLASA e IGG) que são divergentes entre si. O objetivo final é verificar as diferenças regionais e estabelecer a unificação do sistema altimétrico da SABESP na Região Metropolitana de São Paulo (RMSP).<br>One of the purposes of this work was introduce the methodology involved in the estimate of the transformation parameters between two Geodetic Systems, in function of the implantation of the Geographical Information System by SABESP. This work has been developed in São Paulo City, where transformation parameters were calculated between systems SAD-69 (South American Datum 1969) and Córrego Alegre. The estimated parameters at this work had been compared with the available parameters nowadays. Another study, of this work, is the proposal for compatibility of the altimetric system of SABESP. The current system is formed by diverse altimetric nets (IBGE, SABESP, EMPLASA and IGG) that are divergent between themselves. The final objective is to verify the regional differences and to establish the unification of the altimetric system in São Paulo Metropolitan Region (RMSP).
17
Kujiraoka, Scott R., and Russell G. Fielder. "Using GPS for TSPI and Flight Termination Capabilities of a Missile Telemetry Section." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605058.
Testo completoAbstract (sommario):
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>The Joint Advanced Missile Instrumentation (JAMI) Program involves the integration of Global Positioning System (GPS) tracking technology into the Test Ranges. GPS Technology will be used for Time, Space, and Position Information (TSPI) as well as Flight Termination purposes. JAMI is currently developing the JAMI TSPI Unit (JTU) and the Flight Termination Safe & Arm (FTS&A) devices. This paper will discuss the current efforts to integrate these JAMI components, off the shelf items (Flight Termination Receivers (FTR), Telemetry Transmitters, Encryptor and Thermal Batteries) and in-house developed devices (PCM Encoder, Tri-band Antenna with integrated Limiter, Filter, and Amplifier) into a five-inch diameter Missile Telemetry (TM) Section. The discussion of the transmission of the data and how the Test Ranges process it is beyond the scope of this paper and is covered in [1].
18
Meyer, Steven J. "INTEGRATING THE JOINT ADVANCED MISSILE INSTRUMENTATION (JAMI) TIME SPACE POSITION INFORMATION (TSPI) UNIT (JTU) INTO A TELEMETRY SYSTEM." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/605057.
Testo completoAbstract (sommario):
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>The Joint Advance Missile Instrumentation (JAMI) program has developed a Time Space Position Information (TSPI) unit (JTU). The JTU employs a novel use of Global Positioning System (GPS) technology, and inertial measurement units (IMU) to provide a real time trajectory for high dynamic missile systems. The GPS system can function during high g maneuvers that an air-to-air missile might encounter. The IMU is decoupled from the GPS sensor. The IMU data is a secondary navigation source for the JTU and will provide platform attitude. The GPS data and IMU data are sent to the ground in telemetry packet called TSPI Unit Message Structure (TUMS). The TUMS packet is sent to a computer that hosts the JAMI Data Processing (JDP) software, which performs a Kalmam filter on the GPS and IMU data to provide a real time TSPI solution to the range displays. The packetized TUMS data is available in three different output formats: RS-232 serial data, 16-bit parallel and PCM. This paper focuses on how to integrate the JTU into a telemetry system, use it as a standalone system, and provides examples of possible uses.
19
Meyer, Steven J. "TELEMETRY GROUND STATION CONFIGURATION FOR THE JOINT ADVANCED MISSILE INSTRUMENTATION (JAMI) TIME SPACE POSITION INFORMATION (TSPI) UNIT (JTU)." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604888.
Testo completoAbstract (sommario):
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>The Joint Advance Missile Instrumentation (JAMI) program has developed a Time Space Position Information (TSPI) unit (JTU). The JTU employs a novel use of GPS technology and inertial measurement units (IMU) to provide a real time trajectory for high dynamic missile systems. The GPS system can function during high g maneuvers that an air-to-air missile might encounter. The IMU is decoupled from the GPS sensor. The IMU data is a secondary navigation source for the JTU and will provide platform attitude. The GPS data and IMU data are sent to the ground in a telemetry packet called TUMS (TSPI Unit Message Structure). The TUMS packet is sent to a computer that hosts the JAMI Data Processing (JDP) software, which performs a Kalmam filter on the GPS and IMU data to provide a real-time TSPI solution to the range displays. This paper focuses on the equipment and software needed at a telemetry ground station to display the real time TPSI solution on the range displays. It includes an overview of the system data flow. This overview should help a potential user of the system understand what is involved in running the JAMI system. The post mission tools to provide an accurate trajectory and end-game scoring will not be discussed in this paper.
20
Pagan, Jesus Manuel. "Cable-Suspended Robot System with Real Time Kinematics GPS Position Correction for Algae Harvesting." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1539256829665799.
Testo completo
21
Kujiraoka, Scott R., and Russell G. Fielder. "Current Status of Integrating GPS and Flight Termination Capabilities into a Missile Telemetry Section." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604267.
Testo completoAbstract (sommario):
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California<br>Last year (2005), a paper discussed the efforts of integrating Joint Advanced Missile
Instrumentation (JAMI) Program components (JAMI TSPI Unit - JTU, and the Flight
Termination Safe & Arm device - FTS&A), commercial off the shelf parts (Flight Termination
Receivers, Telemetry Transmitter, Encryptor and Thermal Batteries) and in-house developed
devices (PCM Encoder and Tri-band Antenna with integrated Limiter, Filter, & Amplifier) into a
five-inch diameter Missile Telemetry (TM) Section. This retrofitted missile would be captive-carried
on a F/A-18 jet. This paper is a continuation of that one presented at the 2005
International Telemetry Conference (ITC) Symposium. It annotates the latest status of the
JAMI Effort, as well as the Follow-On Effort to qualify the Missile TM Section for an actual
missile firing. This would include the developmental and flight qualification efforts for the
Explosive Train (Detonation Cord-to-Cutter Ring Assembly) and Thermal Batteries.
22
Kujiraoka, Scott R., Russell G. Fielder, and Alvia D. Sandberg. "Adding Flight Termination Capability to a Missile Telemetry Section." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606126.
Testo completoAbstract (sommario):
ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Past presented papers [1,2] have discussed the integration efforts of incorporating Central Test & Evaluation Investment Program (CTEIP) sponsored Joint Advanced Missile Instrumentation (JAMI) components (namely the JAMI TSPI Unit-JTU), Commercial off the Shelf (COTS) parts (e.g. ARTM Tier I SO-QPSK Transmitter, Encryptor and Thermal Battery), and in-house developed devices (such as PCM Encoder and Dual Band Antenna) into a five-inch diameter Missile Telemetry (TM) Section. A prototype of this TM Section has been built up and integrated into an All Up Round (AUR) Missile and twice flown as a Captive Carried Test Missile (CTM) on an F/A-18 jet with great success. This TM Section has passed all flight qualification testing (including environmental and electro-magnetic interference-EMI tests). This paper will detail the current efforts to incorporate Flight Termination System (FTS) capabilities into this TM section. In addition, the effort to upgrade some Navy and Air Force Test Ranges (with JAMI Ground Stations and Decommutators/Demodulators) to track and gather data from this Missile containing the new TM section will be discussed.
23
Kujiroaoka, Scott R., Russell G. Fielder, and Alvia D. Sandberg. "Current Status of Adding GPS Tracking Capability to a Missile Telemetry Section." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606153.
Testo completoAbstract (sommario):
ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>Past presented papers have discussed the integration efforts of incorporating Central Test & Evaluation Investment Program (CTEIP) sponsored Joint Advanced Missile Instrumentation (JAMI) components (namely the JAMI TSPI Unit-JTU), Commercial off the Shelf (COTS) parts (e.g. ARTM Tier I SO-QPSK Transmitter, Encryptor and Thermal Battery), and in-house developed devices (such as PCM Encoder and Dual Band Antenna) into a five-inch diameter Missile Telemetry (TM) Section. A prototype of this TM Section has been built up and integrated into an All Up Round (AUR) Missile and twice flown as a Captive Carried Test Missile (CTM) on an F/A-18 jet with great success. This TM Section is in the process of undergoing flight qualification testing (including environmental and electro-magnetic interference-EMI tests). After which it will be ready for mass production. This paper will detail these current efforts. In addition, the effort to upgrade some Navy and Air Force Test Ranges (with JAMI Ground Stations and Decommutators/Demodulators) to track and gather data from this Missile containing the new TM section will be discussed. Future plans to incorporate Flight Termination System (FTS) capabilities into the TM section will be covered as well.
24
Meyer, Steven J. "GPS Receiver Testing on the Supersonic Naval Ordnance Research Track (SNORT)." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/609808.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>There is an interest in using Global Positioning System (GPS) receivers to find: Time Space Position Information (TSPI), miss distances between a missile and target, and using the data real time as an independent tracking aid for range safety. Ashtech, Inc. has several standalone GPS receivers they believe can work at high g levels. This paper investigates how the Ashtech GPS receivers work under high g loading in one axis. The telemetry system used to collect data from the receivers and the reconstruction of the data will also be discussed. The test was done at SNORT (Supersonic Naval Ordnance Research Track) located at NAWS, China Lake, CA. The g level obtained was about +23 g’s with a deceleration of -15 g’s. The velocity reached was about Mach 2.0. A summary of the errors is included.
25
Sama, Michael P. "PRECISE EVALUATION OF GNSS POSITION AND LATENCY ERRORS IN DYNAMIC AGRICULTURAL APPLICATIONS." UKnowledge, 2013. http://uknowledge.uky.edu/bae_etds/14.
Testo completoAbstract (sommario):
A method for precisely synchronizing an external serial data stream to the pulse-per-second (PPS) output signal from a global navigation satellite-based system (GNSS) receiver was investigated. A signal timing device was designed that used a digital signal processor (DSP) with serial inputs and input captures to generate time stamps for asynchronous serial data based on an 58593.75 Hz internal timer. All temporal measurements were made directly in hardware to eliminate software latency. The resolution of the system was 17.1 µs, which translated to less than one millimeter of horizontal position error at travel speeds typical of most agricultural operations.
The dynamic error of a TTS was determined using a rotary test fixture. Tests were performed at angular velocities ranging from 0 to 3.72 rad/s and a radius of 0.635 m. Average latency from the TTS was shown to be consistently near 0.252 s for all angular velocities and less variable when using a reflector based machine target versus a prism target. Sight distance from the target to the TTS was shown to have very little effect on accuracy between 4 and 30 m. The TTS was determined to be a limited as a position reference for dynamic GNSS and vehicle auto-guidance testing based on angular velocity.
The dynamic error of a GNSS receiver was determined using the rotary test fixture and modeled as discrete probability density functions for varying angular velocities and filter levels. GNSS position and fixture data were recorded for angular velocities of 0.824, 1.423, 2.018, 2.618, and 3.222 rad/s at a 1 m radius. Filter levels were adjusted to four available settings including; no filter, normal filter, high filter, and max filter. Each data set contained 4 hours of continuous operation and was replicated three times. Results showed that higher angular velocities increased the variability of the distribution of error while not having a significant effect on average error. The distribution of error tended to change from normal distributions at lower angular velocities to uniform distributions at higher angular velocities. Internal filtering was shown to consistently increase dynamic error for all angular velocities.
26
Meyer, Steven J. "SIDEWINDER MISSILE GPS RECEIVER TESTS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/607341.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The use of Global Positioning System (GPS) receivers as a source to provide Time Space
and Position Information (TSPI), and Miss Distance Indication (MDI) data in Test and
Evaluation (T&E) applications is being considered. Specifically, GPS receivers are being
evaluated to determine their usefulness as a sensor in a Sidewinder missile telemetry
system (AN/DKT-80). Initial testing has indicated that position information generated from
a GPS receiver can provide significantly better position data than a radar tracking system
when using Double Differential error correction techniques. This concept requires a GPS
reference station to be located in the general proximity of the Telemetry data-receiving
site. Software has been developed that will compare GPS data from the airborne telemetry
system to the GPS reference station and display a real-time TSPI solution. This software
will also provide MDI information from two different airborne sources that are equipped
with GPS receivers (missile and drone). To prove out this concept, a Commercial Off the
Shelf (COTS) Commercially/Available (C/A) code GPS receiver was integrated into the
AN/DKT-80 Sidewinder telemetry system (TM). A MQM-107 drone was instrumented
with the same GPS receiver, as was a ground based reference station. A simple TM was
developed for the drone that telemeters only the GPS data. The modified AN/DKT-80
system incorporated an Inertial Measurement Unit (IMU) into the design. Post processing
software was developed that will integrate the IMU information with the GPS data so
accurate position can be generated if the GPS data was momentarily lost. A missile firing
is scheduled for the spring of 1999 to prove this concept.
27
Shengxi, Ding, Zhang Qishan, and Li Xianliang. "STUDY ON OEM-BASED DIFFERENTIAL GPS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608441.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Two kinds of differential GPS (DGPS) technology on position differential GPS and pseudo-range differential GPS are studied and compared in this paper. Positioning tests by single GPS receiver, position DGPS and pseudo-range DGPS systems based on GPSOEM board are done. Experiment result indicates that position error is about 30 - 100 meters on single GPS receiver and position error is reduced to 3 - 10 meters on DGPS. Furthermore, Developed DGPS system which is based on GPS-OEM has the advantages of low cost, utility and flexibility, etc.
28
Hurd, William J., Joseph I. Statman, and Victor A. Vilnrotter. "GPS HIGH DYNAMIC RECEIVER TRACKING DEMONSTRATION RESULTS." International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615742.
Testo completoAbstract (sommario):
International Telemetering Conference Proceedings / October 28-31, 1985 / Riviera Hotel, Las Vegas, Nevada<br>Demonstration results are presented for a high dynamic GPS receiver. The receiver tested is a breadboard unit capable of tracking one simulated satellite signal in pseudorange and range rate. The receiver makes approximate maximum likelihood estimates of pseudorange and range rate each 20 ms, and tracks these observables using a third order filter with a time constant of 0.14 s. Carrier phase is not tracked, which eliminates the typical failure mode of loss of carrier lock associated with PLLs at high dynamics. The receiver tracks with pseudorange lag errors of under 0.06 m when subjected to simulated 50 g turns with 40 g/s peak jerk. Pseudorange errors due to receiver noise alone are approximately 0.6 m rms at a carrier power to noise spectral density ratio of 34 dB-Hz. The tracking threshold SNR is approximately 28 dB-Hz, which provides 12 dB margin relative to the 40 dB-Hz that occurs with minimum specified satellite signal strength, 3.5 dB system noise figure, and 0 dBi antenna gain.
29
Wood, Christopher. "What lies above : using poetic methods to interrogate user positions across GNSS infrastructures." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/53587.
Testo completoAbstract (sommario):
This thesis argues for the use of what I term `poetic methods' in approaching the study of Global Navigation Satellite Systems (GNSS) infrastructures. Poetic methods frame research experiments with techniques drawn from art practice and build understandings of an infrastructure's actions, or the \texture" [1] of those actions by leveraging symbol and metaphor. This work is situated in an interdisciplinary space across Human Computer Interaction (HCI), art, design and the study of Science, Technology and Society (STS). The theoretical grounding of the work draws on Actor Network Theory (ANT) and Karen Barad's intra-activity [2] to emphasise sociotechnical practices and objects as emergent across combinations of material agency. From Bowker and Star's concept of infrastructural inversion [1], I argue that infrastructures become visible through points of breakdown. To probe GNSS infrastructure, I stage an experiment where its smooth operation is disrupted. Re-framing the infrastructure in this way draws participant's attention to its influence in forming practices. I then use a second method of short form speculative design [3] workshops to have participants think about scenarios where the user is pushed further into the background and user and infrastructure are understood as nodes in `more-than-human-networks'. Alongside this participant-facing research work, I give an account of artworks that developed from my own practice in response to the research questions. These are understood as deep responses to the design workshops' prompt to re-think how we understand the actions, influence and ontology of GNSS infrastructures. At the end of this art and research process I have a finished artwork and several sets of rich qualitative data. I use these to understand how effective my techniques are in achieving infrastructural inversion, diagnostically understanding the actions of GNSS infrastructure and the texture of how those actions are felt by participants, and interrogating ontological questions around concepts of `user' and `infrastructure'. I argue that the poetic methods offer an innovative set of techniques that can be added to a wider research project to help interrogate blackboxing, practically achieve infrastructural inversion and begin to move towards ontological critique. These offer a new methodological tool to STS researchers and contribute to HCI debates around non- user-centered design practices. I offer some suggestions for further refinements to these techniques and point towards some possible future work.
30
Young, Nolan B. "Using the Global Positioning System (GPS) to fulfill the position/location requirements of the National Training Center (NTC) and other U.S. Army instrumented testing and training ranges." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28632.
Testo completo
31
Kujiraoka, Scott R., and Russell G. Fielder. "USING COOPERATIVE RESEARCH AND DEVELOPMENT AGREEMENTS (CRADA) TO REDUCE THE TRANSITION TO PRODUCTION RISK OF A MISSILE TELEMETRY SECTION." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604581.
Testo completoAbstract (sommario):
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>The Joint Advanced Missile Instrumentation (JAMI) Program’s main thrust has
been the integration of Global Positioning System (GPS) tracking technology into the
Department of Defense (DoD) Missile Test Ranges. This technology could be used for
Time, Space, Position, and Information (TSPI), Flight Termination (FTS), or End Game
Scoring purposes. However the Program’s main goal is to develop Proof-of-Concept
components only. Transitioning Missile technology developed by the Government to
Private Industry, so that it can be economically mass produced, has been quite a
challenge. Traditionally, private industry has had to bid on proposals without much
detailed information on how these components have been designed and fabricated.
These unknown risks, Non-Recurring Engineering (NRE) and Missile Flight Qualification
costs, routinely have significantly increased the price of these procurement contracts.
In order so that the Fleet can economically utilize these components in the field,
Cooperative Research and Development Agreements (CRADA) between the
Government and Private Industry have been used to successfully transition Government
developed technology to mass production. They can eliminate the NRE and flight
qualification costs to provide for an economical and low risk method of providing the
Fleet with the latest advances in GPS Tracking Technology. This paper will discuss
how this is currently being accomplished in the development of a conformal wraparound
instrumentation antenna for a five-inch diameter Missile Telemetry (TM) Section.
32
Lee, Shane-Woei. "A carrier phase only processing technique for differential satellite-based positioning systems." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1181175000.
Testo completo
33
Oliveira, Tiago Carletti Antunes de. "Estudos sobre desempenho de sistemas de piloto automático em tratores." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11148/tde-10112009-150847/.
Testo completoAbstract (sommario):
Para o cenário da sustentabilidade da cana um dos problemas é o tráfego indiscriminado de rodados sobre as soqueiras, especialmente na colheita mecanizada, devido a desalinhamentos das fileiras de cana e dificuldade de manutenção dos veículos e composições devidamente afastados destas. Assim, as tecnologias de direcionamento automático estão ganhando espaço no setor sucroalcooleiro. No cenário da citricultura a implantação de um pomar é uma etapa de extrema importância econômica, uma vez que estão envolvidas diversas operações mecanizadas. O alinhamento das fileiras é feito manualmente, etapa que demanda a utilização de uma equipe composta por um topógrafo e cerca de 8 a 10 funcionários. A utilização de sistema de direcionamento automático (piloto automático) elimina esta operação consequentemente reduzindo o número de funcionários. A partir disso o objetivo desse trabalho foi avaliar o desempenho da utilização de alguns modelos de piloto automático em cana-de-açúcar e citros. Na cultura da cana-de-açúcar o objetivo foi avaliar a acurácia de sistemas de piloto automático na operação de abertura de sulcos. Na cultura de citros o objetivo foi avaliar a acurácia do sistema de piloto automático na abertura de sulcos para transplantio e analisar o desempenho operacional e econômico do sistema de piloto automático confrontado como a prática usual, de alinhamento ótico e manual. No primeiro foram realizados ensaios combinando dois tipos de piloto automático (universal e integrado), na abertura de sulcos para plantio de cana, em diferentes tratores, com dois tipos de sinal de GPS (SF1 e RTK) na operação de abertura de sulcos em canade- açúcar para avaliar o erro de paralelismo dos equipamentos. Os ensaios foram realizados com três repetições em percursos retos e curvos. Para o cálculo dos erros de paralelismo utilisou-se um GPS com sinal RTK coletando os dados de cada percurso sendo possível determinar o posicionamento em relação à linha referencia A-B. A segunda parte do trabalho, com citros, foi dividida em duas etapas. A primeira consistiu em georreferenciar as plantas com sulcos feitos com e sem a utilização de piloto automático. Na segunda etapa do trabalho foi conduzida a avaliação da capacidade operacional da abertura de sulcos, com e sem a utilização de piloto automático coletando dados de tempos e de movimentos com um receptor de GPS. Para os ensaios em operação de abertura de sulcos no plantio de cana-de-açúcar com utilização do piloto automático o sistema integrado obteve melhor desempenho que o sistema universal tanto em percursos retos quanto em percursos curvos. Em percursos retos o sistema universal 200 obteve valores de erros médios menores que o sistema universal 100, o oposto ocorrendo em percursos curvos. O sinal RTK obteve melhor acurácia em relação ao sinal SF1. Na implantação de pomares de citros foi obtido um erro médio de desalinhamento de 0,08 m em sistema convencional de sulcagem contra um erro médio de 0,04 m do piloto automático. A operação de sulcagem utilizando o piloto automático apresentou uma eficiência de campo média menor. Porém, com piloto automático foi possível trabalhar com velocidades maiores, o que resultou numa maior capacidade de campo efetiva e consequentemente menor custo operacional.<br>For the sugarcane scenery one of the sustainability problems is the indiscriminate traffic of machinery wheels on the sugar cane, especially in the mechanical harvest, due to misalignment of the cane rows and difficulty of maintenance of the vehicles and compositions away of the crop rows. This is the reason the technologies of auto-guidance systems are succeeding in the sugar cane business. In the scenery of the citrus the implantation of an orchard is a stage of extreme economical importance due to the high cost, once several automated operations are involved. After the soil tillage, the manual alignment of the rows is accomplished for the transplanting, stage that demands the use of a team composed by a topographer and about 8 to 10 staffs. The use of auto-guidance systems provides the elimination of the manual alignment of the rows for transplanting and consequent reduction of the number of staffs. The technologies of autoguidance systems based on orientation through satellites intend to improve the alignment and the operational capacity of mechanized operations. The target of this work was to evaluate the performance of the use of some auto-guidance systems in sugarcane and citrus. In sugarcane the objective was to evaluate the accuracy of auto-guidance system in the furrows opening. In citrus the target was to evaluate the accuracy of auto-guidance systems in the opening furrows for transplanting and to analyze the operational and economical performance of an auto-guidance system compared to the usual practice, of optic and manual alignment. In the first test, on sugar cane, two types of guidance systems (universal and integrated) were involved, with two types of GPS signals (SF1 and RTK) and two types of tractors (Valtra BH 180 and John Deere 7815). Three replications were accomplished in the operation of opening furrows to evaluate parallelism errors of auto-guidance equipments in straight and curved tracks. The second part of the research was divided in two parts. The first stage consisted on georreferencing the plants in the field three months after the transplanting using both technologies for furrows opening, auto-pilot and manual alignment. In the second stage field capacities were evaluated by collecting data with a GPS receiver, with the tractor under the two conditions, with and without auto-guidance use. For the tests on opening furrows in sugarcane the integrated auto-guidance obtained better accuracy than the universal systems in straight tracks and in curved tracks, presenting lower aligning errors. In straight tracks the universal system 200 resulted in lower error values than the universal system 100. The universal system 100 resulted in lower errors in curved lines than the universal system 200. All the evaluated technologies obtained better performance in straight tracks. RTK signal had better accuracy when compared to SF1. In the implantation of citrus orchards the average aligning error on furrows opening was 0.08 m in the conventional system against 0.04 m for the auto-guidance systems. The opening of furrows operation using the auto-guidance presented lower field efficiency. However, with auto-guidance it was possible to work with higher speeds, what resulted in a higher field capacity and smaller operation cost.
34
Tiesler, Russell Colin, and n/a. "A Decade of GPS geodesy in the Australian region: a review of the GDA94 and its performance within a time series analysis of a 10 year data set in ITRF 2000." University of Canberra. Information Sciences & Engineering, 2005. http://erl.canberra.edu.au./public/adt-AUC20051202.114435.
Testo completoAbstract (sommario):
The University of Canberra (UC) has been involved in GPS processing since the late 1980s. This processing commenced with the GOTEX 1988 campaign and progressed through a series of project specific regional campaigns to the current daily processing of a distributed set of continuously operating sites for the determination of precise GPS station positions for user applications. Most of these earlier campaigns covered only short periods of time, ranging from a few weeks to multiple occupations of a few days to a time over one to two years.
With software developments, these multiple occupations were able to be combined to produce results from which crustal motion velocities could be extracted. This first became feasible with the processing of the Australian National Network (ANN), which yielded realistic tectonic velocities from two occupations (1992 and 1993) of sites 12 months apart. Subsequently, this was successfully extended by a further 12 months, with re-occupation of certain sites for a third time in 1994.
Analysis of the results indicated that the accuracy of determining the earth signals improved as the time span from first to last observation was increased. The same was true also for the determination of the position of global references sites. However, by current standards the results achieved were poor.
Consequently, the process was extended to combine the results of subsequent campaigns with the original ANN data set. From 1995 to 1999, campaigns were conducted across Australia, covering many State and tide gauge sites included in the original ANN solution. These provided additional multiple occupations to improve the determinations for both position and velocity. UC has maintained a data set of the global IGS sites, commencing with the IGS pilot campaign of 1992. Daily data sets for those global sites, which contained days common to the regional campaigns, were processed to produce our own independent global orbit and reference frame connection.
The motivation for doing so was fourfold.
�Firstly, to see if historic data could be reprocessed using current modern software and thus be able to be incorporated in this and other analysts research programs.
�Secondly, to compare the results of the reprocessing of the original data set using modern software with the original ANN solution and then validate both the solutions.
�Thirdly, to extend the timespan of observations processed to include more recent campaigns on as many original sites as possible. This to achieve a stronger solution upon which to base the determination of an Australian tectonic plate velocity model and provide quality assurance on the solution comparisons with re-observed sites.
�Fourthly, to develop a set of transformation parameters between current coordinate systems and the GDA94 system so as to be able to incorporate new results into the previous system.
The final selection of regional and global sessions, spanning from mid 1992 to late 2002, contained almost 1000 individual daily solutions. From this 10 year data span a well determined rigid plate tectonic motion model was produced for Australia. This site velocity model was needed to develop a transformation between the thesis solution in ITRF00 an the GDA94 solution in ITRF92. The significant advantage of the plate velocity model is that all Australian sites can now have computed a realistic velocity, rather than being given a value which has been interpolated between sites whose velocities had been determined over a one or two year span. This plate velocity model is compared with the current tectonic motion NNR-NUVEL-1A model and other recently published models.
To perform the comparison between the thesis solution in ITRF00 and the GDA solution in ITRF92 a transformation was developed between the two reference systems. This set of transformation parameters, in conjunction with the plate velocity model developed, enables site solutions at any epoch in the current ITRF00 to be converted onto the GDA94, and vice versa, with a simple, non-varying seven parameter transformation.
The comparisons between the solutions are analysed for both horizontal position and height consistency. There were 77 sites whose differences were compared. The horizontal consistency was within estimated precisions for 75 of the 77 sites. However, the vertical comparisons revealed many of the single epoch sites, especially in 1992, have inconsistent results between the two solutions. The heights from this thesis for some West Australian sites were compared with analysis done by DOLA and the height recoveries are very similar, indicating a weakness in the GDA94 solution for some of the single epoch sites. Some of these differences have been resolved but others are still under investigation.
This thesis describes the repocessing of the original ANN data set, the addition of later data sets, the results obtained, and the validation comparisons of the old and new solutions. As well as the plate velocity model, transformation is provided which enables the user to compute between the GDA94 system, and any epoch result in ITRF00.
Recommendations are made as to which sites need additional work. This includes sites which only need further analysis or investigation and those which require further observations to achieve a result which will have acceptable accuracy and reliability.
35
Sagner, Johanna. "En komparation mellan Sverige och Finland : En jämförelseanalys mellan grannländernas utbildningssystem, läroplan för gymnasieskolan och lärarens yrkesstatus i skolans verksamhet." Thesis, Södertörns högskola, Lärarutbildningen, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-43704.
Testo completoAbstract (sommario):
The aim of this study is to compare Sweden and Finland with regards to the education systems in each country. The comparison is made based on three factors that can explain the different outcomes in the Swedish and Finnish schools. The three factors are: the education system, the curricula in upper secondary school, and the teacher's professional status. Inherent from these factors, the following three questions will be answered: 1. What are the similarities and differences between the Swedish and Finnish education systems? 2. What are the similarities and differences between the Swedish and Finnish school curricula in upper secondary school? 3. Is there any difference between the teacher's professional status in Swedish and Finnish schools? In the analysis, applies the theories: Freidson's three logicians and the pedagogical reform movement Global Education Reform Movement, GERM. Research and analysis are based on articles from Swedish and Finnish researchers, debate articles and teacher magazines. By applying a comparative analysis approach, the factors were used to compare the similarities and differences between both countries. The main difference between Sweden and Finland is that they have two different educational systems. The Finnish education system has achieved a success because of their own structured system. They do not follow the Global Education Reform Movement that the Swedish education system does. Another difference between Sweden and Finland is about the teacher's professional status. The professional position for the Swedish teachers has failed. The explanation why is that the bureaucracy but more importantly the market has taken over the role of teacher and affected their professional status. Finland, instead, has a high professionalism when it comes to the teacher’s professional status. An example of similarity between Sweden and Finland is that the school curricula in upper secondary school have the same values and the purpose of the education. In conclusion, Finland has a better approach in their educational system that differentiates itself from GERM.
36
Mináč, Ján. "Systém navigace pomocí GPS pro účely cementárenské technologie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217779.
Testo completoAbstract (sommario):
This diploma work deals with proposal and implementation GPS navigation system. Work includes described basic types of cement quarry and proposal to create mathematical and software model of quarry. Then work is devoted to possibilities of basic described algorithms for searching the shortest way in graph and two algorithms are described. They are Floyd-Warshall and Dikjstra algorithms. The work describe implementation of Dijkstra algorithm to model of quarry and description of the programs Autec RouteEditor and AQL Control Library. MINÁČ, J. GPS navifgation system for cement for cement technology. Brno: Brno university of technology, Faculty of electrical engineering and communication, 2009. 90 p. Supervisor prof. Ing. František Zezulka, CSc.
37
Dainty, Benjamin G. "Use of two-way time transfer measurements to improve geostationary satellite navigation :." Ft. Belvoir Defense Technical Information Center, 2007. http://handle.dtic.mil/100.2/ADA472457.
Testo completo
38
Lima, Davi Dantas. "Desvendando a matemática do GPS." Mestrado Profissional em Matemática, 2013. https://ri.ufs.br/handle/riufs/6507.
Testo completoAbstract (sommario):
The purpose of this monograph is to study the mathematical principles behind the Global Positioning System, the so-called GPS. We start with a historical approach of the evolution of this technology. Then we show some theorems in geometry: plane, spatial and analytic, which together with some physical principles (average speed, speed of light, the Doppler effect,...) guided the creators of this powerful tool that determines with remarkable accuracy the position (latitude, longitude and altitude) of a transmitter.
Finally, we suggest activities to be performed at the level of basic education, to stimulate students curiosity by scientific knowledge contained therein.<br>A presente monografia tem como objetivo evidenciar os princípios matemáticos por trás do funcionamento do Sistema de Posicionamento Global conhecido por GPS. Após uma abordagem geral da evolução ocorrida até chegarmos a essa tecnologia, demonstraremos alguns teoremas das geometrias: plana, espacial e analítica que, aplicados juntamente com alguns princípios da Física (velocidade média, velocidade da luz, efeito Doppler,...), nortearam os criadores desta poderosa ferramenta que determina com notáveis precisão e exatidão, em qualquer parte do globo terrestre incluindo a atmosfera, a hora e a posição (latitude, longitude e altitude) de um transmissor. E, a partir daí, sugerir atividades interdisciplinares, a serem desenvolvidas em nível de educação básica, que estimulem a curiosidade dos alunos pelos conhecimentos científicos nelas contidos.
39
Moffo, Dermas. "Positionnement pour les systèmes de MEMS intelligents : positionnement pair-à-pair multi-modal : vers un protocole de positionnement pour les MEMS intelligents distribués." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD061.
Testo completoAbstract (sommario):
Les avancées réalisées dans le processus de fabrication de micros-éléments et de circuits intégrés ont permis l’émergence de microsystèmes. De nombreux projets sont conduits afin d’une part, de miniaturiser le plus possible des microrobots MEMS individuels capables de remplir un ensemble donné de fonctionnalités, et, d’autre part, d’intégrerde l’intelligence, de la communication et de la coordination aux microsystèmes permettant d’obtenir des systèmes distribués de microrobots, comprenant des centaines voir des milliers de micros-éléments. Ces micros-éléments disposent de ressources individuelles limitées, mais leur utilisation collective permet d’avoir des systèmes capables derésoudre des problèmes d’une grande complexité.Nous proposons, dans le cadre de cette thèse, des solutions de positionnement pour les microsystèmes et les systèmes de microrobots communiquant par contact. Les Microrobots MEMS sur lesquels portent nos travaux sont des microsystèmes dont la taille varie du micromètre à quelques millimètres, dotés de très faibles capacités de calcul, de stockage, communicant par contact et dont la communication se limite aux éléments en contact direct. Dans ce travail, nous proposons une modélisation pour le positionnement des microrobots MEMS. En nous appuyant sur cette modélisation, nous avons proposé un algorithme de positionnement séquentiel pour les systèmes de MEMS. C’est un algorithmeséquentiel centralisé qui traite du positionnement mixte (à la fois relatif et absolu) en 2D et 3D sans mobilité et qui permet aussi de déterminer l’orientation du microrobot MEMS. Nous avons enfin proposé un algorithme distribué de positionnement pour les systèmes de MEMS ultra-denses. Cet algorithme distribué se base sur les échanges entre les différents microrobot MEMS pour propager les informations utilisées pour le positionnement<br>The advances made in the process of manufacturing microelements and integrated circuits have led to the emergence of microsystems. Numerous projects are carried out in order to miniaturize as much as possible individual micorobots MEMS capable of filling a given set of functionalities, and, on the other hand, to integrate intelligence, communication andcommunication, microsystems coordination to obtain distributed microrobot systems, including hundreds or even thousands of micro-elements. These microelements have limited individual resources, but their collective use makes it possible to have systems capable of solving problems of great complexity. For this thesis, we propose positioning solutionsfor microsystems and microrobot systems communicating by contact. The Microrobots MEMS on which our work is focused are microsystems ranging in size from micrometre to millimeters, with very low computing capacity, storage, communicating by contact and whose communication is limited to elements in direct contact. In this work, we propose a modeling forthe positioning of microrobots MEMS. Based on this modeling, we proposed a sequential positioning algorithm for MEMS systems. It is a centralized sequential algorithm that deals with the mixed positioning (both relative and absolute) in 2D and3D without mobility and that also allows to determine the orientation of the microrobot MEMS. We then proposed a distributed positioning algorithm for ultradense MEMS systems. This distributed algorithm is based on the exchanges between the different microrobot MEMS to propagate the information used for the positioning
40
Vestin, Albin, and Gustav Strandberg. "Evaluation of Target Tracking Using Multiple Sensors and Non-Causal Algorithms." Thesis, Linköpings universitet, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-160020.
Testo completoAbstract (sommario):
Today, the main research field for the automotive industry is to find solutions for active safety. In order to perceive the surrounding environment, tracking nearby traffic objects plays an important role. Validation of the tracking performance is often done in staged traffic scenarios, where additional sensors, mounted on the vehicles, are used to obtain their true positions and velocities. The difficulty of evaluating the tracking performance complicates its development. An alternative approach studied in this thesis, is to record sequences and use non-causal algorithms, such as smoothing, instead of filtering to estimate the true target states. With this method, validation data for online, causal, target tracking algorithms can be obtained for all traffic scenarios without the need of extra sensors. We investigate how non-causal algorithms affects the target tracking performance using multiple sensors and dynamic models of different complexity. This is done to evaluate real-time methods against estimates obtained from non-causal filtering. Two different measurement units, a monocular camera and a LIDAR sensor, and two dynamic models are evaluated and compared using both causal and non-causal methods. The system is tested in two single object scenarios where ground truth is available and in three multi object scenarios without ground truth. Results from the two single object scenarios shows that tracking using only a monocular camera performs poorly since it is unable to measure the distance to objects. Here, a complementary LIDAR sensor improves the tracking performance significantly. The dynamic models are shown to have a small impact on the tracking performance, while the non-causal application gives a distinct improvement when tracking objects at large distances. Since the sequence can be reversed, the non-causal estimates are propagated from more certain states when the target is closer to the ego vehicle. For multiple object tracking, we find that correct associations between measurements and tracks are crucial for improving the tracking performance with non-causal algorithms.
41
"Position determination of mobile unit based on inertial navigation system." 2008. http://library.cuhk.edu.hk/record=b5893583.
Testo completoAbstract (sommario):
Yip, Wai Lee.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2008.<br>Includes bibliographical references (leaves 119-124).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>摘要 --- p.ii<br>Acknowledgement --- p.iii<br>Table of Content --- p.iv<br>List of Figure --- p.vi<br>List of table --- p.viii<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Motivation --- p.1<br>Chapter 1.2 --- Background information --- p.2<br>Chapter 1.2.1 --- Overview of positioning technologies --- p.2<br>Chapter 1.2.2 --- Comparison between different positioning systems --- p.7<br>Chapter 1.2.3 --- Recent works related to INS --- p.9<br>Chapter 1.3 --- Objective --- p.11<br>Chapter 1.4 --- Organization of thesis --- p.11<br>Chapter Chapter 2 --- Literature Study --- p.13<br>Chapter 2.1 --- Introduction to INS --- p.13<br>Chapter 2.1.1 --- Coordinate Frames --- p.13<br>Chapter 2.1.2 --- Gimbaled INS --- p.16<br>Chapter 2.1.3 --- Strapdown INS --- p.17<br>Chapter 2.1.4 --- Conventional algorithm of strapdown INS --- p.17<br>Chapter 2.2 --- Inertial sensors --- p.19<br>Chapter 2.2.1 --- Gyroscope --- p.19<br>Chapter 2.2.2 --- Accelerometer --- p.20<br>Chapter 2.3 --- Previous works --- p.22<br>Chapter 2.4 --- GF-INS --- p.23<br>Chapter 2.5 --- Summary --- p.25<br>Chapter Chapter 3 --- Performance of MEMS accelerometer in position determination --- p.27<br>Chapter 3.1 --- Basic principle --- p.27<br>Chapter 3.2 --- Numeric integration --- p.28<br>Chapter 3.3 --- Experimental setup --- p.30<br>Chapter 3.3.1 --- MEMS Accelerometer --- p.30<br>Chapter 3.3.2 --- Microcontroller --- p.32<br>Chapter 3.3.3 --- System architecture --- p.33<br>Chapter 3.3.4 --- Testing platform --- p.34<br>Chapter 3.4 --- Initial calibration and filtering --- p.37<br>Chapter 3.4.1 --- Convert ADC reading to acceleration --- p.37<br>Chapter 3.4.2 --- Identify configuration error --- p.38<br>Chapter 3.4.3 --- Implement low pass filter --- p.39<br>Chapter 3.5 --- Experimental results --- p.40<br>Chapter 3.5.1 --- Results --- p.40<br>Chapter 3.5.2 --- Discussion --- p.43<br>Chapter 3.6 --- Summary --- p.45<br>Chapter Chapter 4 --- Performance Improvement --- p.46<br>Chapter 4.1 --- Fuzzy logic based steady state detector --- p.46<br>Chapter 4.1.1 --- Principle --- p.46<br>Chapter 4.1.2 --- Experimental result --- p.48<br>Chapter 4.2 --- Kalman filtering --- p.50<br>Chapter 4.2.1 --- Discrete Kalman filter --- p.50<br>Chapter 4.2.2 --- Combine with fuzzy logic based steady state detector --- p.52<br>Chapter 4.2.3 --- Experimental results --- p.54<br>Chapter 4.3 --- Summary --- p.58<br>Chapter Chapter 5 --- Construction of GF-INS --- p.59<br>Chapter 5.1 --- Principle of GF-INS --- p.59<br>Chapter 5.1.1 --- Algorithm --- p.59<br>Chapter 5.1.2 --- Comparing error of GF-INS and conventional INS --- p.66<br>Chapter 5.1.3 --- Simulation study --- p.67<br>Chapter 5.2 --- Experimental setup --- p.73<br>Chapter 5.3 --- Experimental Results --- p.75<br>Chapter 5.4 --- Summary --- p.81<br>Chapter Chapter 6 --- Improvement on the GF-INS --- p.82<br>Chapter 6.1 --- Configuration error compensation --- p.82<br>Chapter 6.1.1 --- "Identify bias, scale factor and sensing direction error" --- p.83<br>Chapter 6.1.2 --- Identify position error --- p.86<br>Chapter 6.1.3 --- Compensator design --- p.89<br>Chapter 6.1.4 --- Simulation --- p.91<br>Chapter 6.2 --- Fuzzy rule based motion state detector --- p.97<br>Chapter 6.2.1 --- Relation of data in different motions --- p.97<br>Chapter 6.2.2 --- Fuzzy system --- p.99<br>Chapter 6.2.3 --- Membership function training with gradient descent --- p.101<br>Chapter 6.3 --- Experimental results and discussion --- p.104<br>Chapter 6.3.1 --- Configuration errors --- p.104<br>Chapter 6.3.2 --- Compensator --- p.106<br>Chapter 6.3.3 --- Fuzzy rule based motion state detector --- p.107<br>Chapter 6.3.4 --- Comparing the performance of both methods --- p.110<br>Chapter 6.3.5 --- Comparing GF-INS and one dimensional INS --- p.112<br>Chapter 6.3.6 --- Discussion --- p.113<br>Chapter 6.4 --- Summary --- p.115<br>Chapter Chapter 7 --- Conclusions and Future works --- p.116<br>Reference --- p.119
42
Ming, Chen Chi, and 陳濟民. "The Future Trend of Global Position System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/88731741974479975415.
Testo completoAbstract (sommario):
碩士<br>輔仁大學<br>科技管理學程碩士在職專班<br>102<br>While the development of Global Position System (GPS) is rising around the world, what’s new and the future in GPS is now an important issue. This study not only conducts literature review but also conducts surveys with senior experts to find out what’s the trend of GPS. This study sums up GPS related literature and senior experts in GPS industry as conclusions. The result shows that the integration of different system must be the trend, the network RTK (Real - time kinematic) and PPP (precise point positioning) technology could greatly improve the positioning accuracy up millimeter level. And the application of Indoor Messaging System (IME) and Receiver Autonomous Integrity Monitoring (RAIM) could very possible solve the difficulties of indoor positioning and the safety problems caused by navigation errors.
43
Cheng, Ssu-Min, and 鄭斯民. "The Improvement of Coordinate Parameters for Global Position SystemThe Improvement of Coordinate Parameters for Global Position System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/86358452394840872553.
Testo completoAbstract (sommario):
碩士<br>國立高雄應用科技大學<br>電子工程系<br>99<br>GPS positioning in Taiwan is not easy because of the topography and urban density issues. Using GPS positioning and digital maps, it always takes lots of time to locate the position. If the traffic information could be transmitted to other vehicles while driving, the application of GPS could be enlarged.
In this thesis, we use add direction and speed parameter of coordinates for AIS concept which is applied to improve the accuracy of the Global Positioning System (GPS). The research send the information to the positioned target by Bluetooth, and keep calculating the target coordinate in the 2-dimension to meet the criteria. As the results, the target coordinate could be well positioned in the narrow topography by using this methodology, and diversity of coordinate information.
44
Ma, Chin-Hung, and 馬景宏. "Car-Based Channel Model Research for Global Position System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/63418255913167393435.
Testo completoAbstract (sommario):
碩士<br>中原大學<br>電機工程研究所<br>95<br>Abstract
This thesis investigates the car-based channel model to evaluate the wireless performance for handheld device in the open space by adding a factor from the “Scenario Signal Strength” method.
Traditionally using the test equipment with antenna and “DUT(Device Under Test)” to find out the value of the signal strength is the most popular method to find out the DUT performance in the specific test environment. By using this method we can find out the relationship between the channel model and our test environment after analysis the test results. Rayleigh fading distribution and Rician fading distribution are the basic types for the LOS and none LOS environment. We will use the Global Position System for the 1575.42MHz signal strength research in LOS put the device in a car. In this thesis, we will use a “Scenario Signal Strength” method for the AUD performance estimation. We will introduce the CTIA test program in Chapter3.2 and we will test the AUT performance in a CTIA approved 3D chamber, and then provide several models to simulate the near field affection for the AUD. We can provide several different factors to compensate the near field affection for the antenna when we do the performance test in the car.
“Scenario Signal Strength” factor is a compensation value for channel model when the antenna in the user equipment is impacted by the environments. In recent years the handheld product is more and more popular for people. The concept that adds the near field affection for a channel model is helped to have a more accurate value for evaluation.
45
Chang, Geng-Kwei, and 張耕魁. "Integration of Global Position System and Inertial Navigation System Using Kalman Filter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/6xt8vt.
Testo completoAbstract (sommario):
碩士<br>國立臺北科技大學<br>機電整合研究所<br>96<br>Global Position System (GPS) is broadly used in military or civil navigation devices. GPS can work for a long time and its output can still remain stable. But it is easily interfered by external factors such as weather, building and etc.
Inertial Navigation System (INS) doesn’t have the above defects of GPS but its accuracy is reduced by integration errors. Integration errors come from many factors. The errors are mostly caused by output errors and axis misalignment factor. Therefore, calibration and compensation of output errors are required before apply INS. This paper contains state equations of system and the method theory of INS’s calibration and compensation.
The purpose of this paper is to apply Kalman Filter to integrate GPS and INS such that the system can still calculate its position by INS’s signals even if lost GPS signals.
46
Lin, Chun-Ming, and 林俊明. "The Use of Global Position System Improve the Handoff Blocking Rate." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/55874623486225258433.
Testo completoAbstract (sommario):
碩士<br>國立高雄第一科技大學<br>電腦與通訊工程系<br>89<br>In this paper, our predictive channel reservation (PCR) scheme work by sending reservation requests to neighboring cells based on extrapolating the motion of mobile station using Global Position System (GPS). The scheme is applicable to both fixed and dynamic channel allocation methods and we can use a number of design enhancements are incorporated to minimize the effect of false reservations and to improve the handoff blocking rate and new call blocking rate of the cellular system. These enhancements include：reservation pooling, queuing of reservation request, hybrid approach for integrated guard channels (GC’s) and using a threshold distance (TD). We investigates the impact of the value of the TD to handoff blocking rate of cellular system in detail. It is a parameter used to control the timing of sending channel reservation. In order to control the handoff blocking rate, we adopt the TD value according to the number of reservation channels. The simulation result also verity the predictive channel reservation scheme based on extrapolating the movement of mobile station use GPS measurements superior to the GC scheme and it can reduce the handoff blocking rate and new call blocking rate. The result also give some good opinions and future works.
47
Wang, Yaung, and 汪揚. "A Low Power Integer-N Frequency Synthesizer for Global Position System." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/5g5pbg.
Testo completoAbstract (sommario):
碩士<br>國立交通大學<br>電信工程系所<br>92<br>In this thesis, we demonstrate a low power synthesizer for global position system (GPS) which operates at 1.57GHz. For low power consumption consideration, we set the supply voltage at 1.5V, and adopt the “Integer-N” type frequency synthesizer to save power. For high integration issue, all circuits are integrated in single chip except the loop filter and the reference oscillator. This chip is fabricated by TSMC 0.25um.
The measurement of power consumption is 14.1mW for 1.5V supply voltage. VCO consumes 6.8mW, frequency divider consumes 6.6mW, charge pump consumes 0.64mW, and phase/frequency detector consumes less than 1mW.
48
Huang, Dao-Shen, and 黃道伸. "Study on Radio Frequency Low Noise Amplifiers Design for Global Position System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/74247164700203166565.
Testo completoAbstract (sommario):
碩士<br>國立暨南國際大學<br>電機工程學系<br>93<br>This study is aimed to discuss the front circuit of Global Position System, especially in the design of Low Noise Amplifier. The research will introduce basic parameter and common RF circuit architecture. Feedback type of low noise amplifier is designed to meet the specification of Global Position System. Feedback type of low noise amplifier could lower the temperature influence as well as improve the linear degree of the front circuit. The front circuit adapts two stages of hetero-junction FET. Its function is to supply low noise figure so as to restrict the noise from the channel select filter. Finally, the characteristic of BJT is applied to design a single feedback type of low noise amplifier to improve available power gain and meet the specification of Global Position System. In two stages feedback of low noise amplifier, the noise figure of simulation is 0.8dB; available power gain is 18.96 dB; VSWR for input and output is 1.55 and1.52. Besides, IIP3 locates on –7.92 dBm and P1dB poses on -18.5 dBm. In Single feedback type of low noise amplifier, its simulation explains that the noise figure is 1.94 dB, 16.5dB for available power gain, 1.58 for Input VSWR, 1.53 for Output VSWR. IIP3 locates on -6.16 dBm. P1dB poses on-21.5 dBm. In general, the performance results of noise figure in front circuit is 0.87 dB. Available power gain is 33 dB. VSWR for input and output is 1.54 and 1.63.IIP3 locates on -23.53 dBm. P1dB poses on -32.5 dBm. The temperature variation range of front circuit is from -30 degree to 85 degree. The difference from the highest figure to the lowest figure is 1.1 dB. Noise Figure is fixed under some condition. In the aspect of the linear figure, the difference of IIP3 locates in the range of 1dB.
49
Lee, Chia-Yang, and 李佳陽. "In Integrating the Radio Frequency Identification and Global Position System Data Processing." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/50735057331788809324.
Testo completoAbstract (sommario):
碩士<br>國立臺灣海洋大學<br>電機工程學系<br>96<br>An approach is proposed in this thesis to integrate the GPS and RFID techniques for vehicle position monitoring. In this approach, Vehicle is equipped with the GPS signal sender and RFID tag. When the vehicle enters the tunnel and losing the GPS signal, the RFID readers inside the tunnel can scan the tag and provide the position information of vehicle.
The area location sensing method is used in our approach. The tunnel can be divided into many area segments and the center of each segment has a preset GPS coordinate. When the vehicle enters the tunnel and is detected, the preset GPS coordinate will become the position information of the vehicle. Our approach can solve the location information losing problem effectively. Furthermore, the capability of vehicle position monitoring can be improved.
50
Hsu, Che Hsien, and 許哲賢. "A Case Study of Global Position System Industry Analysis and Competitive Strategy." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/13846480365772853387.
Testo completoAbstract (sommario):
碩士<br>輔仁大學<br>科技管理學程碩士在職專班<br>96<br>The Global Positioning System (“GPS”) industry is growing vigorously and creating new business opportunities after the US Government cancelled the “Selective Availability” codes. Market pull and technology push become the factors of the growth of the GPS industry. The GPS industry’s key technology is related to chip and software; the companies in Taiwan therefore have the advantage of manufacturing because of their production capability. This research, under the theories of Diamond Model, SWOT Analysis, Industrial Life Cycle Model, and Six Force Theory, analyzes the structure and factors of the industry development, discovers the strategies of those companies which are in the growing period of the GPS industry, and also suggests that the industry is gradually moving from one-way navigation function towards the value-added service provision.A case company is the object to study the industry development. The analysis of the case company’s advantages of costs and differentiation is based on the study of internal capability and outside competitors, together with the Value Chain model, and the conclusion of which is that such case company trusts the expansion of brand business as the direction of the industry development. As the final point, this research uses the theory of Blue Ocean Strategy to build up the frame of the Strategy Canvas and Four Actions for discussions of the paths of forming price innovation and strategies the case company adopts to move towards the Blue Ocean.This research is mainly to provide the contribution by creating the strategic patterns suitable for development of the GPS industry which is rising up rapidly, through the summaries of all the strategic theories I studied in the past, in association with the development of the case company. The purpose of this research is to find out the most appropriate competition pattern for the company, help the company to create the greatest value, and therefore become a useful reference.