Academic literature on the topic 'Radar Environmental aspects'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Radar Environmental aspects.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Radar Environmental aspects"
1
Liu, Yuhang, Yu Shen, Lili Fan, Yonglin Tian, Yunfeng Ai, Bin Tian, Zhongmin Liu, and Fei-Yue Wang. "Parallel Radars: From Digital Twins to Digital Intelligence for Smart Radar Systems." Sensors 22, no. 24 (December 16, 2022): 9930. http://dx.doi.org/10.3390/s22249930.
Full textAbstract:
Radar is widely employed in many applications, especially in autonomous driving. At present, radars are only designed as simple data collectors, and they are unable to meet new requirements for real-time and intelligent information processing as environmental complexity increases. It is inevitable that smart radar systems will need to be developed to deal with these challenges and digital twins in cyber-physical systems (CPS) have proven to be effective tools in many aspects. However, human involvement is closely related to radar technology and plays an important role in the operation and management of radars; thus, digital twins’ radars in CPS are insufficient to realize smart radar systems due to the inadequate consideration of human factors. ACP-based parallel intelligence in cyber-physical-social systems (CPSS) is used to construct a novel framework for smart radars, called Parallel Radars. A Parallel Radar consists of three main parts: a Descriptive Radar for constructing artificial radar systems in cyberspace, a Predictive Radar for conducting computational experiments with artificial systems, and a Prescriptive Radar for providing prescriptive control to both physical and artificial radars to complete parallel execution. To connect silos of data and protect data privacy, federated radars are proposed. Additionally, taking mines as an example, the application of Parallel Radars in autonomous driving is discussed in detail, and various experiments have been conducted to demonstrate the effectiveness of Parallel Radars.
2
Li, Xinzhi, and Shengbo Dong. "Research on Efficient Reinforcement Learning for Adaptive Frequency-Agility Radar." Sensors 21, no. 23 (November 27, 2021): 7931. http://dx.doi.org/10.3390/s21237931.
Full textAbstract:
Modern radar jamming scenarios are complex and changeable. In order to improve the adaptability of frequency-agile radar under complex environmental conditions, reinforcement learning (RL) is introduced into the radar anti-jamming research. There are two aspects of the radar system that do not obey with the Markov decision process (MDP), which is the basic theory of RL: Firstly, the radar cannot confirm the interference rules of the jammer in advance, resulting in unclear environmental boundaries; secondly, the radar has frequency-agility characteristics, which does not meet the sequence change requirements of the MDP. As the existing RL algorithm is directly applied to the radar system, there would be problems, such as low sample utilization rate, poor computational efficiency and large error oscillation amplitude. In this paper, an adaptive frequency agile radar anti-jamming efficient RL model is proposed. First, a radar-jammer system model based on Markov game (MG) established, and the Nash equilibrium point determined and set as a dynamic environment boundary. Subsequently, the state and behavioral structure of RL model is improved to be suitable for processing frequency-agile data. Experiments that our proposal effectively the anti-jamming performance and efficiency of frequency-agile radar.
3
Sterlyadkin, Victor V. "Some Aspects of the Scattering of Light and Microwaves on Non-Spherical Raindrops." Atmosphere 11, no. 5 (May 21, 2020): 531. http://dx.doi.org/10.3390/atmos11050531.
Full textAbstract:
A review of the author’s work on the study of the microphysics of rain is carried out. The effect of an anomalously high modulation of light scattered by oscillating drops of water, which consists in the formation of powerful pulses of light when illuminating an oscillating drop with continuous light and observation at scattering angles near a first-order rainbow, is described and explained. The anomalous scattering tracks obtained in the photographs provide information on the mass, average shape, mode, and amplitude of oscillations for each drop, by analogy with the Wilson camera. In field measurements, spatial selection of droplets by size was detected, when droplets of different sizes were grouped in different parts of space. The theoretical substantiation of the grouping of rain particles in space under the influence of wind gusts is carried out. It has been shown that the grouping and clustering of raindrops affects the relationship between radar reflectivity Z and rain intensity R. The influence of non-sphericity and oscillation of raindrops on the scattering of microwave radiation is studied. Polarization methods are proposed for enhancing or sharply reducing the contributions of the asphericity of raindrops to reflected radar signals.
4
Pearce, Andre, J. Andrew Zhang, and Richard Xu. "A Combined mmWave Tracking and Classification Framework Using a Camera for Labeling and Supervised Learning." Sensors 22, no. 22 (November 16, 2022): 8859. http://dx.doi.org/10.3390/s22228859.
Full textAbstract:
Millimeter wave (mmWave) radar poses prosperous opportunities surrounding multiple-object tracking and sensing as a unified system. One of the most challenging aspects of exploiting sensing opportunities with mmWave radar is the labeling of mmWave data so that, in turn, a respective model can be designed to achieve the desired tracking and sensing goals. The labeling of mmWave datasets usually involves a domain expert manually associating radar frames with key events of interest. This is a laborious means of labeling mmWave data. This paper presents a framework for training a mmWave radar with a camera as a means of labeling the data and supervising the radar model. The methodology presented in this paper is compared and assessed against existing frameworks that aim to achieve a similar goal. The practicality of the proposed framework is demonstrated through experimentation in varying environmental conditions. The proposed framework is applied to design a mmWave multi-object tracking system that is additionally capable of classifying individual human motion patterns, such as running, walking, and falling. The experimental findings demonstrate a reliably trained radar model that uses a camera for labeling and supervision that can consistently produce high classification accuracy across environments beyond those in which the model was trained against. The research presented in this paper provides a foundation for future research in unified tracking and sensing systems by alleviating the labeling and training challenges associated with designing a mmWave classification model.
5
Castillo, Sergio, Tomeu Rigo, and Carme Farnell. "Can the Correlation between Radar and Cloud-to-Ground Daily Fields Help to Identify the Different Rainfall Regimes? The Case of Catalonia." Atmosphere 13, no. 5 (May 16, 2022): 808. http://dx.doi.org/10.3390/atmos13050808.
Full textAbstract:
The rainfall regime is changing in the Catalan territory, likely in most areas in the Mediterranean Basin. This variability, spatial and temporal, means that there may be periods of severe drought combined with periods of heavy rainfall and floods. In this way, the management of water resources is complicated and can produce a high impact on different social aspects. The high convective activity leads to investigating the relationship between the electric discharges and radar parameters (reflectivity, echo top, vertically integrated liquid, and accumulated rainfall). The correlation allows identifying some elements that may be significant in terms of changes in rainfall regimes. Besides, using several radar parameters apart from precipitation accumulation reveals interesting explicit patterns of the previously known. These patterns can help better understand the precipitation behavior and the changes associated with it.
6
Et al., Jawad. "The Al-Abiadh Valley Drainage Basin Environmental Aspects Extraction Using Quantitatively Morphometric Analyses of Shuttle Radar Topographic Mission Data." Baghdad Science Journal 16, no. 1 (March 11, 2019): 0097. http://dx.doi.org/10.21123/bsj.2019.16.1.0097.
Full textAbstract:
The accurate extracting, studying, and analyzing of drainage basin morphometric aspects is important for the accurate determination of environmental factors that formed them, such as climate, tectonic activity, region lithology, and land covering vegetation.
This work was divided into three stages; the 1st stage was delineation of the Al-Abiadh basin borders using a new approach that depends on three-dimensional modeling of the studied region and a drainage network pattern extraction using (Shuttle Radar Topographic Mission) data, the 2nd was the classification of the Al-Abiadh basin streams according to their shape and widenings, and the 3rd was extracting then taking up the quantitative analysis technique to estimate the basin morphometric aspects and the basin's environmental parameters that created them.
The Al-Abiadh valley basin is a six-order one with a dendritic, parallel, and deranged drainage network. The flood hazard is absent at the basin mouth because the valley runoff takes a long time to reach the sink (Al-Razaza Lake), located in the middle part of Iraq, with a low flow peak due to the high permeability soil, the arid to semi-arid climate, and the low annual precipitation rate.
The region studied is an alluvial basin with similar geological structural solidity in most places. The drainage network was found to be controlled by lineaments and fracture traces; the basin has passed its youth geomorphic phase.
7
A., Pandharpatte Priyanka, Adake Ashutosh D., Sapkal Neha R, and M. M. Maske. "Review of Applications of Ground Penetrating Radar as an NDT Tool." ASEAN Journal of Science and Engineering 2, no. 2 (August 19, 2021): 115–28. http://dx.doi.org/10.17509/ajse.v2i2.37975.
Full textAbstract:
Ground-penetrating radar (also referred to as GPR, ground probing radar, or georadar) is a near-surface geophysical tool with a wide range of applications. Over the past 30 years, GPR has been used successfully to aid in constraining problems in diverse fields such as archaeology, environmental site characterization, glaciology, hydrology, land mine/unexploded ordinance detection, sedimentology, and structural geology. In many cases, however, GPR surveys have been planned or executed with little or no understanding of the physical basis by which GPR operates and is constrained. As a result, many unsuccessful GPR studies have also been presented or published over the past 30 years. The objectives of this primer are to (1) provide an introduction to the important variables pertinent to GPR and (2) explain the relevant aspects of these variables in GPR acquisition, in an attempt to provide fundamental knowledge for improving GPR usage in the future.
8
Petruck, A., and F. Sperling. "Radar-aided CSO-control-criteria for an ecological approach." Water Science and Technology 36, no. 8-9 (October 1, 1997): 223–28. http://dx.doi.org/10.2166/wst.1997.0670.
Full textAbstract:
The control strategy of a combined sewer system incorporating three stormwater storage tanks with overflows presented here attempts to consider all aspects of acute CSO effects. These are the hydraulic and the composition components as well as the time factor. The result is an integrated approach, which is not based on the classic emission view (i.e. reduction of volume), but on pollution criteria (i.e. possible harm to the biotic community). The aim is to reduce the exceeding of critical peak values of the CSO components at critical time intervals. Control decisions will be based on continuous measurements in the sewer system and in the receiving stream. Furthermore the measurements are carried out to determine the effects (both hydraulic and chemical) of particular CSO discharges in order to evolve the critical values for the project area. The chemical and physical measurements are accompanied by a biological monitoring programme. Macroinvertebrates are sampled upstream and downstream of outfalls and at a reference site. This allows the evaluation of the control measures on an ecological basis, and thus an assessment of the ecological potential of radar-aided real-time control of the combined sewer systems.
9
Dias, Erika Rodrigues. "Geração de Modelo Digital de Elevação utilizando dados do SRTM como subsídio ao planejamento e gestão territorial do município de Lucena(PB)/Generation of Digital Elevation Model using SRTM data as grant to territorial planning and management (...)." Caderno de Geografia 26, no. 45 (December 30, 2015): 151. http://dx.doi.org/10.5752/p.2318-2962.2016v26n45p151.
Full textAbstract:
<p>Uma das grandes preocupações da atualidade encontra-se no uso racional das terras, conciliando aspectos sociais, econômicos e ambientais tornando necessário o planejamento territorial através de um conhecimento detalhado da superfície territorial. Dessa forma, é de fundamental importância a representação do terreno. Assim, este trabalho teve por objetivo gerar um modelo digital de elevação – MDE, utilizando imagens de radar SRTM com a finalidade de servir como subsídio à gestão e planejamento territorial. Os materiais utilizados nesse trabalho foram imagens de radar da missão Shuttle Radar Topography Mission – SRTM, imagens obtidas do Google Earth e softwares específicos. Como resultados foram gerados diversos produtos cartográficos que possibilitaram o reconhecimento territorial do município como os mapas de hipsometria e clinografia da área em estudo e a representação tridimensional do relevo visando servir como subsídio à gestão territorial e planejamento do meio físico.</p><p><strong>Palavras-Chave</strong>: Modelo Digital de Elevação, SRTM, Geotecnologias.</p><p><strong>Abstract</strong></p><p>A major concern of today is in the rational use of land, combining social, economic and environmental aspects making it necessary to territorial planning with a detailed knowledge of land area. Thus, it is fundamental to representation of the terrain. Thus, this study aimed to generate a digital elevation model - MDE using SRTM radar images in order to serve as a resource management and territorial planning. The materials used in this work were the mission radar images Shuttle Radar Topography Mission - SRTM, images obtained from Google Earth and specific software. The results were generated several cartographic products enabled the territorial recognition of the city as hypsometry maps and clinografia of the study area and the three-dimensional relief representation to serve as subsidy for territorial planning and management of the physical environment.<strong> </strong></p><p><strong> Keywords</strong>:Digital Elevation Model, SRTM, Geotechnology.</p><p> </p><p> </p>
10
Eaton, R. M., S. E. Masry, and B. Shaw. "Investigations in combining ship’s position, radar and chart data on a single electronic display." CISM journal 42, no. 4 (January 1988): 353–59. http://dx.doi.org/10.1139/geomat-1988-0030.
Full textAbstract:
To explore safety aspects of the Electronic Chart (EC), and to learn about the role of the Hydrographic Office in producing an EC database, the Canadian Hydrographic Service has developed an “EC testbed”, under contract, and is now starting a series of investigations with it. This paper describes the Testbed, and lessons learned in developing and sea-testing it, and out¬lines future plans.
Dissertations / Theses on the topic "Radar Environmental aspects"
1
Trisasongko, Bambang Physical Environmental & Mathematical Sciences Australian Defence Force Academy UNSW. "Monitoring a mine-influenced environment in Indonesia through radar polarimetry." Awarded by:University of New South Wales - Australian Defence Force Academy, 2008. http://handle.unsw.edu.au/1959.4/39747.
Full textAbstract:
Although remotely sensed data have been employed to assess various environmental problems, relatively few previous studies have focused on the impacts of mining. In Indonesia, mining activities have increasingly become one of major drivers of land cover change. The majority of remote sensing research projects on mining environments have exploited optical data which are frequently complicated by tmospheric disturbance, especially in tropical territories. Active remote sensors such as Synthetic Aperture Radar (SAR) are invaluable in this case. Monitoring by Independent SAR data has been limited due to single polarisation. Dual-polarised data have been employed considerably, although for some forestry applications the data were found insufficient to retrieve basic information. This Masters thesis is devoted to assess fully polarimetric SAR data for environmental monitoring of the tailings deposition zone of the PT Freeport Indonesia Grasberg mine in Papua, Indonesia. The main data were two granules of the AIRSAR datasets acquired during the PACRIM-II campaign. To support the interpretation and analysis, a scene of Landsat ETM February 2001) was used, juxtaposed with classified aerial photographs and a series of SPOT VEGETATION images. Both backscattering information and complex coherence matrices, as common representations of polarimetric data, were studied. Primary applications of this research were on degraded forest and environmental rehabilitation. Most parts of Indonesian forests have experienced abrupt changes as an impact of clear-cut deforestation. Gradual changes such as those due to fire or flooded tailings, however, are least studied. It was shown that the Cloude-Pottier polarimetric decomposition provided a convenient way to interpret various stages of forest disturbance. The result suggested that the Entropy parameter of the Cloude-Pottier decomposition could be used as a disturbance indicator. Using the fully polarimetric dataset combined with Support Vector Machine learning, the outcomes were generally acceptable. It was possible to improve classification accuracy by incorporating decomposition parameters, although it seemed insignificant. Land rehabilitation on tailings deposits has been a central concern of the government and the mining operator. Indigenous plant pioneers such as reeds (Phragmites) can naturally grow on dry tailings where soil structure is fairly well developed. To assist such efforts, a part of this research involved identification of dry tailings. On the first assessment, interpretation of surface scatterers was aided by polarimetric signatures. Apparently, longer wavelengths such as L- and P-band were overpenetrated; hence, growing reeds on dry tailings were less detectable. In this case, the use of C-band data was found fairly robust. Employing Mahalanobis statistics, the combination of HH and VV performed well on classification, having similar accuracy with quad polarimetric data. Extension on previous results was made through the Freeman-Durden decomposition. Interpretation using a three-component image of odd, even bounce and volume scattering showed that dry and wet tailings could be well distinguished. The application was benefited from unique responses of dielectric materials in the tailings deposit on SAR signals; hence it is possible to discriminate tailings with different moisture levels. However, further assessment of tailings moisture was not possible due to security reasons and access limitations at the study site. Fully polarimetric data were also employed to support rehabilitation of stressed mangrove forest on the southern coast. In this case, the Cloude-Pottier decomposition was employed along with textural parameters. Inclusion of textural properties was found invaluable for the classification using various statistical trees, and more important than decomposition parameters. It was concluded that incorporating polarimetric decompositions and textural parameters into coherence matrix leads to profound accuracy.
2
Rawle, Christopher B., and n/a. "Coherent multiwavelength sources for tropospheric aerosol lidar." University of Otago. Department of Physics, 2005. http://adt.otago.ac.nz./public/adt-NZDU20070427.114533.
Full textAbstract:
The monitoring and study of the earth�s atmosphere is becoming an increasingly important task given the current uncertainties in climate prediction. Areas where lidar has been used to further understanding of the atmosphere include monitoring of greenhouse gases, global warming, stratospheric ozone depletion, photochemical smog and aerosol photochemistry. However, the potentially severe long term effects of anthropogenic aerosols on earth�s biosphere are poorly understood. This project seeks to apply state of the art laser technology to develop an innovative multiwavelength lidar system capable of providing new information and new insights into the field of tropospheric aerosol lidar.
Several novel tunable laser and laser-like sources have been investigated and developed for the purpose of tropospheric aerosol lidar at The National Institute of Water and Atmospheric Research (Niwa), Central Otago. Multiwavelength operation in the visible and near infrared portion of the spectrum has been emphasised with the sources developed collectively spanning the wavelength interval of 400-1369 nm. The laser sources investigated were the LiF:F2+ colour centre, Titanium Sapphire (Ti:sapphire) and barium nitrate Raman lasers. In addition to the laser sources, the β-barium borate optical parametric oscillator (BBO OPO) was characterised. For each of the sources, lidar relevant aspects were studied. The results recorded include conversion efficiency with respect to the pump source, linewidth and tuning characteristics, beam quality, temporal behaviour, and device reliability and ruggedness.
It was found that the LiF:F2+ laser offered significantly lower threshold, broader tuning and higher output pulse energies than the Ti:sapphire laser in the 900-1000 nm region. The high optical gain of the LiF:F2+ medium facilitated cavity optical alignment and operation of the system. The high gain also resulted in temporal behaviour well suited to the existing Niwa lidar detection scheme. When using a 5 ns pump source, amplified spontaneous emission (ASE) was found to limit the laser tuning range and efficiency.
The barium nitrate Raman laser was based on a simple linear cavity arrangement which resulted in a compact and robust device with no moving components. The stimulated Raman scattering process offers relatively narrow linewidth laser operation at the first and second Stokes wavelengths of 1197 nm and 1369 nm respectively. This laser offered efficient operation once the high operation threshold was reached. Second harmonic generation was used to extend the number of potential lidar transmitter lines produced. The barium nitrate Raman laser possessed high beam divergence and a maximum of three discrete transmitter wavelengths.
The BBO OPO used a type I collinear signal resonant configuration. A plane-plane cavity configuration with pump reflection was found to provide simplicity of design, low threshold, highly efficient operation and output pointing stability. The BBO OPO signal wavelength could be tuned over the wavelength interval of 400-700 nm. The disadvantage of the plane cavity was high output beam divergence. However, this was successfully brought within the required limits through the use of a 40 mm long cavity in conjunction with an expanding and collimating telescope.
As a result of the study, a Tunable lidar Transmitter (TLT) system based on the BBO OPO was designed and constructed at the Physics Department. The TLT was computer-controlled using custom written software and constructed in a self contained modular manner with all required mechanical, electrical and optical components. A user manual was also written to accompany the TLT. The TLT was installed at Niwa and was successfully used to gather preliminary multiwavelength lidar data.
The TLT BBO OPO threshold occurred for a pump energy of 5.2 mJ (10.6 MW/cm2) and had a maximum slope efficiency of 53%. Signal efficiency varied from 24-41-35% over the intervals of 410-500-600 nm. A maximum signal energy of 21 mJ was obtained for a signal wavelength of 492 nm when using the maximum available pump energy of 42 mJ. OPO signal linewidth varied from 0.1-1-8 nm over the signal wavelength intervals of 400-600-700 nm. The associated OPO finesse varied between 370 and 100 as the signal wavelength was tuned over the wavelength interval of 400-600 nm. The temporal behaviour of the BBO OPO was a slowly varying function of pump energy and closely followed the temporal behaviour of the pump laser, making it well suited to the existing Italian lidar detection and timing scheme.
Books on the topic "Radar Environmental aspects"
1
Kari, James M. Traditional cultural properties in the vicinity of Sparrevohn Long Range Radar Site. [Anchorage]: Cultural Heritage Studies, Environment and Natural Resources Institute, University of Alaska Anchorage, 2006.
Find full text
2
W, Lane John. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
3
W, Lane John. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
4
W, Lane John. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
5
W, Lane John. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
6
Lane, John W. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
7
Lane, John W. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
8
Lane, John W. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
9
W, Lane John. Cross-hole radar scanning of two vertical, permeable, reactive-iron walls at the Massachusetts Military Reservation, Cape Cod, Massachusetts. Storrs, Conn: U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Find full text
10
United States. Congress. Senate. Committee on Governmental Affairs. Ad Hoc Subcommittee on Consumer and Environmental Affairs. The effects of traffic radar guns on law enforcement officers: Hearing before the Ad Hoc Subcommittee on Consumer and Environmental Issues of the Committee on Governmental Affairs, United States Senate, One Hundred Second Congress, second session, August 10, 1992. Washington: U.S. G.P.O., 1993.
Find full textBook chapters on the topic "Radar Environmental aspects"
1
Carić, Hrvoje, and Ivo Beroš. "Aspects of Intensive Short Day Trips on the Remote Pelagic Location: Incorporating Visitor Survey, Radar Tracking and Environmental Risk Analysis in NATURA 2000 Monitoring of the Blue Cave, the Island of Biševo." In Mediterranean Protected Areas in the Era of Overtourism, 265–80. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69193-6_13.
Full text
2
Boci, Erton S., Shahram Sarkani, and Thomas A. Mazzuchi. "Development of a Complex Geospatial/RF Design Model in Support of Service Volume Engineering Design." In Advancements and Innovations in Wireless Communications and Network Technologies, 56–67. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2154-1.ch005.
Full textAbstract:
Today’s National Airspace System (NAS) is managed using an aging surveillance radar system. The radar technology is not adequate to sustain the support of aviation growth and cannot be adapted to use 21st century technologies Therefore, FAA has begun to implement the Next Generation Air Transportation System (NextGen) that would transform today’s aviation and ensure increased safety and capacity. The first building block of the NextGen system is the implementation of the Automatic Dependent Surveillance-Broadcast (ADS-B) system. One of the most important design aspects of the ADS-B program is the design of the terrestrial radio station infrastructure. This design determines the layout of the terrestrial radio stations throughout the United States and is optimized to meet system performance, safety and security. Designing this infrastructure to meet system requirements is at the core of Service Volume (SV) Engineering. In this paper, the authors present a complex Geospatial/RF design ER Development model-based ADS-B SV Engineering design that captures radio sites layout and configuration parameters. CORE software is selected to implement the model-based SV Engineering environment.
3
Howard, Penny McCall. "From ‘where am I?’ to ‘where is that?’ Rethinking navigation." In Environment, Labour and Capitalism at Sea. Manchester University Press, 2017. http://dx.doi.org/10.7228/manchester/9781784994143.003.0005.
Full textAbstract:
Chapter Four continues the discussion of techniques and technologies with a focus on orientation and navigation. The chapter draws on Tim Ingold’s and James Gibson’s descriptions of orientation as a process of movement through the landscape to find affordances. The chapter describes the techniques used locally for finding position from the 1960s onwards: dead-reckoning, and the use of radar, depth sounders, Decca, and GPS. Challenging anthropological accounts of ‘Western’ navigation that assume Westerners always rely on charts and instruments and that these alienate people from direct relations with their environment, the GPS chartplotter shows the perpetual importance of the subjective and experiential aspects of orientation in a digital age. The chapter argues that alienation is instead produced by relations of ownership and exploitation, and that the chartplotter facilitates the centralisation of fishing knowledge with the skipper and the employment of low-waged migrant workers as crew. While authors such as Edwin Hutchins describe navigation as answering the absolute question ‘where am I?’, the chapter proposes that the aim of navigation is usually to answer the relational question ‘where is that?’
Conference papers on the topic "Radar Environmental aspects"
1
Emery, D. J. "Some aspects of design and environmental management in HF surface wave radar." In 2002 International Radar Conference (Radar 2002). IEE, 2002. http://dx.doi.org/10.1049/cp:20020247.
Full text
2
Konopko, Mariola, and Małgorzata Ewa Wysocka. "GPR Method as a Non-Invasive Method for Investigating Organic Soils Deposited under Designed Road Construction." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.140.
Full textAbstract:
GPR method is a non-invasive technique for ground exploration which detects subsurface objects and assesses their presence, as well as provides information about the geological structure of investigation site. Ground penetrating radar method belongs to the group of geophysical methods as it uses electromagnetic waves. GPR technique takes advantage of the differences between the dielectric constants, specific for the material under analysis. One of the factors that are essential to record reliable data is a clear contrast between the dielectric constant of investigated object and its surroundings. One of the major advantages of GPR is that it does not damage ground surface as well as it is completely non-invasive and safe for the environment. Moreover, the method is particularly useful in the design and realisation process of linear objects, for among the multiple aspects of its utilization there is recognition of low-bearing organic soils. The discontinuous nature of traditional methods makes it difficult to precisely specify ground layering as well as accurately locate potential anomalies. The analysis carried out in this study shows that GPR technique can detect the boundaries of soil layers, which considerably simplifies ground assessment.
3
Wright, M. W., D. Franzen, H. Hemmati, and M. Sandor. "Qualification and Reliability Testing of a Microchip Laser System for Space Applications." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35298.
Full textAbstract:
A compact microchip laser pumped by a single fiber coupled diode laser was developed for a scanning laser radar instrument called Laser Mapper (LAMP) to be used as a guidance and control sensor in future JPL/NASA missions [1]. The system involves commercial-off-the-shelf components that were packaged and qualified for space applications. In particular, the system has to meet a 5000 hour minimum life requirement on a LEO platform. This paper discusses the process being used and the results of the selection and qualification of a low cost prepackaged diode laser with a custom packaged microchip laser crystal. The environmental testing would be applicable to a variety of commercial photonic systems. The topics to be discussed include: • The selection of the diode pump laser; • Upscreening of commercial parts; • Qualification sampling tests including temperature cycling, vibration, outgassing; • Physical construction analysis. The testing requirements and screening flow to ensure the lifetime reliability will be presented. This was determined based on input from Telcordia standards that apply to optoelectronic systems used in the telecommunications industry but upgraded to account for the unique aspects of the devices, such as the high optical power. The key elements in packaging high power optoelectronic devices for harsh environments include managing the thermal loading through the expected spacecraft temperature extremes and addressing the die mounting, optical fiber coupling and jacket assembly. Each of these aspects will be discussed in light of the testing results.
4
Miller, Joel, Martine Godfroy-Cooper, and Zoltan Szoboszlay. "Degraded Visual Environment Mitigation (DVE-M) Program, Bumper RADAR Obstacle Cueing Flight Trials 2020." In Vertical Flight Society 77th Annual Forum & Technology Display. The Vertical Flight Society, 2021. http://dx.doi.org/10.4050/f-0077-2021-16747.
Full textAbstract:
The goal of the U.S. Army’s Degraded Visual Environment Mitigation (DVE-M) Program was to develop technologies that enable Army rotorcraft to operate in low-visibility conditions. Technologies included low and highresolution terrain sensors, sensor fusion, pilot cueing, and advanced flight controls. This paper focuses on just one important aspect of the DVE-M system, the ability to sense and cue pilots of obstacles in the vicinity of the rotorcraft. This capability will provide pilots the situational awareness needed to navigate complex environments so that missions can be completed safely and successfully. Though visual displays are useful for conveying multiple viewpoints, an egocentric display is limited to obstacles within the field of view and an exocentric display requires a reference frame transformation relative to the observer. Spatial-auditory displays support an egocentric 360° immersive 3D space in which auditory cues can be placed in direction and distance, and rendered such that realistic motion cues in gain and/or frequency (Doppler) are provided. Though limited in spatial resolution, tactile displays can provide a needed alternative when the visual and auditory channels are overwhelmed or fixated. Leveraging the beneficial aspects of all three, a trimodal obstacle awareness and avoidance display was developed for the DVE-M Program. The display, in concert with a 360° azimuth, 24° elevation bumper radar, was flight tested in the Fort Eustis area by five experimental test pilots. A series of test points were developed that exercised the display for various obstacle types and phases of flight. Upon completion, each pilot was administered usability and workload questionnaires and participated in a cueing debrief session. This paper describes the display design and test points and reports the results of the pilot evaluations.
5
Janković, Jelena. "RADNOPRAVNA SIGNALIZACIJA NA PUTU SPREČAVANjA DEHUMANIZACIJE RADA." In 14 Majsko savetovanje. University of Kragujevac, Faculty of Law, 2018. http://dx.doi.org/10.46793/xivmajsko.1099j.
Full textAbstract:
Leading by the fact that that modern legal transactions, to a certain extent, separates employment from the principle of humanization of work, the author analyzes the flexicurity of working engagement in the so-called "platform" economy, from the aspect of the possibility of creating a new concept of employment. In an era when atypical becomes typical, policy makers and employment protection legislation should be prepared for challenge of changing the structure of the workforce that the "virtual" world of work will put in front of them. Creating ethically legitimate policies to prevent the dehumanization of work in a web working environment requires a rebalancing of the employer-employee scheme. In that sense, the aim of this paper is to analyze possible solutions that would make workers in the "platform" economy as equally visible as workers in traditional employment. Of course, it is necessary to limit, excessively expectations that the prevention of dehumanization of work in the web environment will ensure employment stability, without influence of other factors, but it may be expected that, at least to a certain extent, the dark scenario of hiding human character of work, will be changed.
6
Senel, Numan, Gordon Elger, and Andreas Festag. "Sensor Time Synchronization in Smart Road Infrastructure." In FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-acm-083.
Full textAbstract:
In smart cities, infrastructure-side sensors are already used to increase safety, to mitigate traffic congestion and to reduce pollution caused by vehicles. In the future, infrastructural safeguarding is expected to get a large potential due to availability of advanced infrastructure sensors (camera,radar,lidar) and vehicle-to-infrastructure (V2I) communications. In principle, installations of infrastructure-side sensor systems can be divided into two main categories as temporary and permanent. Permanent systems are typically installed for highly used part of urban environments such as city centers, whereas temporary systems are setup for events in cities (concerts,sports games,etc.) with a temporally high density of traffic participants. For both categories different networking options (wired,wireless) as well as sensor data fusion methods (centralized, decentralized data fusion) are possible in order to meet requirements of the specific use case. In this paper, we consider two main architecture options: (1) wired networking with centralized data fusion (centralize architecture) and (2) wireless networking with decentralized data fusion (decentralized architecture). In the centralized network architecture, the we assume that raw data from multiple sensors will be transmitted to a central processor unit (master). In this architecture, a single node handles the data processing and the fusion process. In the decentralized network architecture, every sensor is equipped with a computing and a communication component. Sensors use a co-located processor unit (slave) to, preprocess data and to transmit these data to a master node. In both architecture options, the master node will be responsible for combining all inputs from multiple sensors to form a common estimate for future state. A centralized architecture requires high-bandwidth connectivity between the sensors and the master, whereas the preprocessing in the decentralized approach has lower demands on the networking bandwidth. Considering the two architectures the synchronization of the sensor time strongly impacts the state estimation. Sensor nodes need to synchronize their operation and collaborate to accomplish the sensing task. For example, in order to track a vehicle, sensors need to report the location and detection time of vehicle to master node. Then, the master node combines the information to estimate the location and velocity of the vehicle. Evidently, if the sensors do not have a common timescale, the state estimation will be inaccurate. Other aspect is how old the fused data (estimation) are before it delivered to road participants. When road participants receive a current estimation at the timestamp T2, these data represent state at time T1. The time difference between T1 and T2 depends on primarily on the network delay and process time of sensor data. For performance evaluation of the network options with respect to time synchronization the data processing will be separated as an additional source of delay. In this paper, we study the two architecture options for a smart road infrastructure. The study is based on prototype system using the Robot Operating System (ROS) and cameras, whereas also other sensors (radar,LiDAR) are considered. We specifically assess the impact of sensor time synchronization on the reliability of the sensor data fusion and evaluate the latency between the acquisition of sensor data and reception of the data by the road participants.