Relevant bibliographies by topics / Satellites

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Satellites'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 September 2024

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Journal articles on the topic "Satellites"

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Shen, Ziyu, Wenbin Shen, Xinyu Xu, Shuangxi Zhang, Tengxu Zhang, Lin He, Zhan Cai, Si Xiong, and Lingxuan Wang. "A Method for Measuring Gravitational Potential of Satellite’s Orbit Using Frequency Signal Transfer Technique between Satellites." Remote Sensing 15, no. 14 (July 12, 2023): 3514. http://dx.doi.org/10.3390/rs15143514.

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We introduce an approach for the direct measurement of the gravitational potential (GP) along the trajectory of a satellite, with a specific focus on Low-Earth Orbit (LEO) satellites. A LEO satellite communicates with several Geosynchronous Equatorial Orbit (GEO) satellites via frequency signal links. The GP difference can be measured in real-time using the gravitational frequency shift approach by equipping both LEO and GEO satellites with precise atomic clocks. Since the GP at the high orbits of the GEO satellites can be precisely determined by the present gravitational field model EGM2008, the GP along the LEO satellite’s trajectory can be determined. In this study, simulation experiments were conducted, featuring a GRACE-type satellite as the LEO satellite in communication with three equidistant GEO satellites. The results indicated that the accuracy of the GP measurements along the LEO satellite’s trajectory primarily depends on the precision of the onboard atomic clocks. Supposing optical atomic clocks attain an instability level of 1×10−17τ−1/2 (τ in seconds), we determined the GP distribution covered by the LEO satellite’s trajectories with 30-day observations. Then, we determined a gravitational field at the centimeter level based on the GP distribution. The GP data derived from the trajectory of a LEO satellite can be utilized to establish temporal gravitational fields, which have broad applications in different disciplines.
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Agrusa, Harrison F., Yun Zhang, Derek C. Richardson, Petr Pravec, Matija Ćuk, Patrick Michel, Ronald-Louis Ballouz, et al. "Direct N-body Simulations of Satellite Formation around Small Asteroids: Insights from DART’s Encounter with the Didymos System." Planetary Science Journal 5, no. 2 (February 1, 2024): 54. http://dx.doi.org/10.3847/psj/ad206b.

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Abstract We explore binary asteroid formation by spin-up and rotational disruption considering the NASA DART mission's encounter with the Didymos–Dimorphos binary, which was the first small binary visited by a spacecraft. Using a suite of N-body simulations, we follow the gravitational accumulation of a satellite from meter-sized particles following a mass-shedding event from a rapidly rotating primary. The satellite’s formation is chaotic, as it undergoes a series of collisions, mergers, and close gravitational encounters with other moonlets, leading to a wide range of outcomes in terms of the satellite's mass, shape, orbit, and rotation state. We find that a Dimorphos-like satellite can form rapidly, in a matter of days, following a realistic mass-shedding event in which only ∼2%–3% of the primary's mass is shed. Satellites can form in synchronous rotation due to their formation near the Roche limit. There is a strong preference for forming prolate (elongated) satellites, although some simulations result in oblate spheroids like Dimorphos. The distribution of simulated secondary shapes is broadly consistent with other binary systems measured through radar or lightcurves. Unless Dimorphos's shape is an outlier, and considering the observational bias against lightcurve-based determination of secondary elongations for oblate bodies, we suggest there could be a significant population of oblate secondaries. If these satellites initially form with elongated shapes, a yet-unidentified pathway is needed to explain how they become oblate. Finally, we show that this chaotic formation pathway occasionally forms asteroid pairs and stable triples, including coorbital satellites and satellites in mean-motion resonances.
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Wu, Huanqin, Maocai Wang, Zhiming Song, Xiaoyu Chen, Guangming Dai, Wei Zheng, and Qingrui Zhou. "Random Error Analysis of Launch and Injection Positions for Distributed Multi Micro-nano Satellite System." Journal of Physics: Conference Series 2640, no. 1 (November 1, 2023): 012014. http://dx.doi.org/10.1088/1742-6596/2640/1/012014.

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Abstract Accurate satellite orbit calculation has always been a focus in the aerospace field. Especially, the error distribution of the orbit involving various internal and external factors in the satellite launch process has an important influence on the effectiveness of the satellite cluster. To qualitatively and quantitatively analyze the cooperative efficiency of multi-satellite clusters involving various random errors, this paper analyzes the random error sources in the launch process of micro-nano satellites and studies the distribution law of these satellite orbit position errors. Based on the parameter estimation and the central limit theorem of probability theory, the expression of the error function for the satellite’s orbit position is also constructed. In addition, the probability distribution model of the satellites in a certain range is designed, and the relationship between the number of satellites and the overall errors is proposed. Finally, the result is verified by the simulation experiment, which provides the rationale behind the position and altitude adjustment and constellation optimization of micro-nano satellites.
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Shakila Hosseinzadeh Kondori, Mustafa Helvacı. "Satellite Temperature Modeling in Geostationary Orbit Using COMSOL." Tuijin Jishu/Journal of Propulsion Technology 44, no. 5 (November 29, 2023): 127–39. http://dx.doi.org/10.52783/tjjpt.v44.i5.2440.

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In our world, communication satellites are becoming more and more significant. They are costly to create, launch, operate, and maintain, thus these costs are crucial. Due to the fact that electronic and satellite components can only operate within a limited temperature range, it is crucial to understand and manage the satellite's temperature in order to maximize efficiency both before and during the mission. This study considers GEO and comparable satellites with the goal of showing satellite temperature. We ignored the entire satellite's internal structure and focused only on the external heat generated by its surface (main body and solar panels). COMSOL is used in this project that is a simulation platform. Finally, the results have been displayed for the model at different times.
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Welling, D. T. "The long-term effects of space weather on satellite operations." Annales Geophysicae 28, no. 6 (June 24, 2010): 1361–67. http://dx.doi.org/10.5194/angeo-28-1361-2010.

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Abstract. Integrated lifetime radiation damage may cause spacecraft to become more susceptible to operational anomalies by changing material characteristics of electronic components. This study demonstrates and quantifies the impact of these effects by examining the National Oceanic and Atmospheric Administration (NOAA) National Geophysical Data Center (NGDC) satellite anomaly database. Energetic particle data from the Geostationary Operational Environmental Satellites (GOES) is used to construct the total lifetime particle exposure a satellite has received at the epoch of an anomaly. These values are compared to the satellite's chronological age and the average exposure per year (calculated over two solar cycles.) The results show that many anomalies occur on satellites that have received a total lifetime high-energy particle exposure that is disproportionate to their age. In particular, 10.8% of all events occurred on satellites that received over two times more 20 to 40 MeV proton lifetime particle exposure than predicted using an average annual mean. This number inflates to 35.2% for 40 to 80 MeV protons and 33.7% for ≥2 MeV electrons. Overall, 73.5% of all anomalies occurred on a spacecraft that had experienced greater than two times the expected particle exposure for one of the eight particle populations used in this study. Simplistically, this means that the long term radiation background exposure matters, and that if the background radiation is elevated during the satellite's lifetime, the satellite is likely to experience more anomalies than satellites that have not been exposed to the elevated environment.
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Zhao, Xiangyu, Chunjuan Zhao, Jiale Li, Yongliang Guan, Shanbo Chen, and Lei Zhang. "Research on Design, Simulation, and Experiment of Separation Mechanism for Micro-Nano Satellites." Applied Sciences 12, no. 12 (June 13, 2022): 5997. http://dx.doi.org/10.3390/app12125997.

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The separation mechanism is a critical device that transports and releases satellites during launch and on-orbit. However, as satellites become smaller and more compact, the traditional belt-locking device or pyrotechnic release and separation device cannot meet the micro-nano satellite’s separation requirements. A novel separation mechanism kinematic system was designed, analyzed, and experimentally verified to achieve non-interference and non-pyrotechnic separation of the satellites from the launch vehicle while maintaining the initial separation attitude. First, an overall structural strategy for the kinematics system was proposed based on the MF (product code of the satellite) satellite’s structural properties. The structural characteristics of the separation mechanism were also confirmed by the principle of energy conservation. Then, a finite element model and a dynamic model of the kinematic coupling system between the MF satellite and the separation mechanism during launch and deployment were constructed, along with an analysis of the mechanical characteristics and a kinematic simulation. Finally, the mechanical characteristics and dependability of the separation mechanism were verified using a ground vibration test and a separation test. The prototype test results demonstrate that the separation process is essentially identical to the numerical simulation results and that the MF satellite can be deployed successfully without interference, with the MF satellite’s initial separation attitude fully satisfying the designed technical indexes.
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Williamson, M. "Satellites rock! [satellite radio]." IEE Review 49, no. 11 (December 1, 2003): 34–37. http://dx.doi.org/10.1049/ir:20031104.

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Tong, Minglei, Song Li, Xiaoxiang Wang, and Peng Wei. "Inter-Satellite Cooperative Offloading Decision and Resource Allocation in Mobile Edge Computing-Enabled Satellite–Terrestrial Networks." Sensors 23, no. 2 (January 6, 2023): 668. http://dx.doi.org/10.3390/s23020668.

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Mobile edge computing (MEC)-enabled satellite–terrestrial networks (STNs) can provide task computing services for Internet of Things (IoT) devices. However, since some applications’ tasks require huge amounts of computing resources, sometimes the computing resources of a local satellite’s MEC server are insufficient, but the computing resources of neighboring satellites’ MEC servers are redundant. Therefore, we investigated inter-satellite cooperation in MEC-enabled STNs. First, we designed a system model of the MEC-enabled STN architecture, where the local satellite and the neighboring satellites assist IoT devices in computing tasks through inter-satellite cooperation. The local satellite migrates some tasks to the neighboring satellites to utilize their idle resources. Next, the task completion delay minimization problem for all IoT devices is formulated and decomposed. Then, we propose an inter-satellite cooperative joint offloading decision and resource allocation optimization scheme, which consists of a task offloading decision algorithm based on the Grey Wolf Optimizer (GWO) algorithm and a computing resource allocation algorithm based on the Lagrange multiplier method. The optimal solution is obtained by continuous iterations. Finally, simulation results demonstrate that the proposed scheme achieves relatively better performance than other baseline schemes.
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Ye, Xin, Zheng Hong Dong, Qing Pan, and Li Hao Liu. "Application of the IOCP in Multi-Domain Modeling and Simulation Based on Multiple Interfaces of Satellite." Advanced Materials Research 1049-1050 (October 2014): 1923–28. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.1923.

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Aiming at modeling and simulation, the study of improving the performance of the method of multi-domain based on multiple interfaces of satellites by the IOCP technology were focused on. The satellite's attitude and orbit controlling simulation platform was build, with the server based on the IOCP technology build, and the designation problem of interfaces between different software solved, while the model of the satellite build, by using software , such as MATLAB / Simulink, ADAMS, Pro/E, STK and VS. Finally, the model of satellite's attitude maneuver was simulated, and the result proved the efficiency of the method of multi-domain based on multiple interfaces of satellites improved by the IOCP technology.
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Parks, Lisa. "Signals and oil." European Journal of Cultural Studies 12, no. 2 (May 2009): 137–56. http://dx.doi.org/10.1177/1367549409102421.

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This article examines the strategies of two satellite operators working across post-communist territories of Central Asia: Eutelsat and Kazsat. To do so it develops a critical approach called footprint analysis, which involves investigating the variety of practices that occur within range of a given satellite's service. Satellites have been used in post-communist territories to circulate broadcast and telecommunication signals, facilitate flows of capital and reshape geographic imaginaries. In addition, satellites have become orbital platforms for the Caspian's booming oil industry. Satellites are used to support everything from surveying oil fields to monitoring drilling operations, from construction of oil rigs to the maintenance of pipelines. The article sets out to develop a model of analysis which can account for the more 'cultural' uses of satellites (i.e. for broadcasting) in relation to their more 'extractive' uses (i.e. for natural resource development).
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Dissertations / Theses on the topic "Satellites"

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Anderson, Jason Lionel. "Autonomous Satellite Operations For CubeSat Satellites." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/256.

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In the world of educational satellites, student teams manually conduct operations daily, sending commands and collecting downlinked data. Educational satellites typically travel in a Low Earth Orbit allowing line of sight communication for approximately thirty minutes each day. This is manageable for student teams as the required manpower is minimal. The international Global Educational Network for Satellite Operations (GENSO), however, promises satellite contact upwards of sixteen hours per day by connecting earth stations all over the world through the Internet. This dramatic increase in satellite communication time is unreasonable for student teams to conduct manual operations and alternatives must be explored. This thesis first introduces a framework for developing different Artificial Intelligences to conduct autonomous satellite operations for CubeSat satellites. Three different implementations are then compared using Cal Poly's CP6 CubeSat and the University of Tokyo's XI-IV CubeSat to determine which method is most effective.
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Appleby, Graham M. "Satellite laser ranging and the ETALON Geodetic satellites." Thesis, Aston University, 1996. http://publications.aston.ac.uk/13270/.

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The technique of Satellite Laser Ranging is today a mature, important tool with applications in many area of geodynamics, geodesy and satellite dynamics. A global network of some 40 stations regularly obtains range observations with sub-cm precision to more than twelve orbiting spacecraft. At such levels of precision it is important to minimise potential sources of range bias in the observations, and part of the thesis is a study of subtle effects caused by the extended nature of the arrays of retro-reflectors on the satellites. We develop models that give a precise correction of the range measurements to the centres of mass of the geodetic satellites Lageos and Etalon, appropriate to a variety of different ranging systems, and use the Etalon values, which were not determined during pre-launch tests, in an extended orbital analysis. We have fitted continuous 2.5 year orbits to range observations of the Etalons from the global network of stations, and analysed the results by mapping the range residuals from these orbits into equivalent corrections to orbital elements over short time intervals. From these residuals we have detected and studied large un-modelled along-track accelerations associated with periods during which the satellites are undergoing eclipse by the Earth's shadow. We also find that the eccentricity residuals are significantly different for the two satellites, with Etalon-2 undergoing a year-long eccentricity anomaly similar in character to that experienced at intervals by Lageos-1. The nodal residuals show that the satellites define a very stable reference frame for Earth rotation determination, with very little drift-off during the 2.5 year period. We show that an analysis of more than about eight years of tracking data would be required to derive a significant value for 2. The reference frame defined by the station coordinates derived from the analyses shows very good agreement with that of ITRF93.
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SYED, ANEES. "COLLISON PREDICTION AND AVOIDANCE OF SATELLITES IN FORMATION." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100034591.

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Cheng, Cheng. "GNSS Multipath and Interference Mitigation Using Bayesian Methods." Thesis, Toulouse, ISAE, 2015. http://www.theses.fr/2015ESAE0011.

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Les récepteurs GNSS sont utilisés pour estimer la position et la vitesse d’un véhicule à partir de signauxtransmis par des satellites. L’estimation est habituellement réalisée en plusieurs étapes. Lesparamètres des signaux qui concernent le délai de propagation, la phase et la fréquence Dopplerde la porteuse, sont estimés et exploités pour estimer des mesures de pseudo-distances et de delta-distances.Ces mesures sont ensuite utilisées comme observation de la position et de la vitesse parl’algorithme de navigation qui délivre l’état du véhicule. En environnement GNSS dégradé les signauxémis par les satellites GPS peuvent subir des réflexions, des réfractions, et suivre ainsi deschemins multiples, communément connus sous le nom de multi-trajets. Ces signaux induisent desdéformations du signal à différents niveaux dans les récepteurs. En particulier il en résulte une distorsiondes fonctions de corrélation et des fonctions de discrimination, ce qui conduit à des erreursdans les estimées de pseudo-distances et de delta-distances et, en conséquence, à une erreur depositionnement. Bénéficiant d’un état de l’art des approches développées pour l’atténuation deseffets des interférences, de nouvelles techniques sont proposées dans cette thèse afin de réduirel’impact des MT sur les performances des récepteurs, et d’améliorer ainsi la précision de positionnementGPS
Global Navigation Satellite Systems (GNSS) receivers calculate the user position, velocity and timeby using the signals received from a set of navigation satellites. In constricted environments, suchas urban canyons or other intensive obstruction scenarios, the signal transmitted by the satelliteis subject to reflection or diffraction and can follow different paths, commonly known as multipath(MP) interferences, before arriving at the antenna of the GNSS receiver. The MP interferencesaffect the signal processing results at different stages in the receiver. For instance, MP signals modifythe correlation and discriminator functions and can introduce errors in pseudo-range (PR) andcarrier phase measurements, resulting finally in GNSS-based positioning errors. Therefore the MPinterference can be considered as a dominant error source in these complex situations. This thesisinvestigates MP mitigation techniques based on signal processing methods at different stages ofthe GNSS receiver. By analyzing and comparing the state-of-the-art MP mitigation approaches, innovativeMP mitigation techniques are proposed in order to reduce the impact of MP interferenceson the GNSS receiver, and to improve the positioning accuracy based on GNSS
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Morimoto, Todd A., Thomas E. Nowitzky, and Steven A. Grippando. "OPERATING A LIGHTWEIGHT, EXPENSIVE LOW EARTH ORBITING SATELLITE." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608842.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California
An increasing number of satellite users and manufacturers are looking to lightweight, inexpensive satellites as substitutes to traditional large, expensive satellites with multiple payloads. Neither the Department of Defense nor the commercial sector can bear the financial or reputational consequences associated with massive program failures. With the low cost and weight of these new satellites, users can achieve mission success without great risk. One example of this new class of inexpensive spacecraft is the RADCAL (RADar CALibration) satellite. Detachment 2, Space & Missile Systems Center at Sunnyvale, CA operates the satellite. RADCAL is a 200-pound polar orbiting satellite with an average altitude of 450 miles. It is primarily used by 77 worldwide radars to calibrate their systems to within five meter accuracy. Also flying on board RADCAL is a communication payload for remote field users with small radios. The RADCAL program has satisfied all mission requirements. However, with the limited size and cost come certain challenges, both in the satellite and on the ground. Pre-launch testing was not as comprehensive as with more expensive programs; anomalies have arisen that require extensive workarounds. Data management is not a straightforward task, and it is sometimes difficult and inexact to track satellite performance. These challenges are presented with their solutions in the following discussion; this paper addresses the functional, operational, and testing aspects associated with the RADCAL satellite.
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Pelletier, Claude. "Méthodologie de détection des feux de forêt à partir d'images satellitaires NOAA /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2001. http://theses.uqac.ca.

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Hutzell, William T. "The variations in the geometric albedo of Titan." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/28054.

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Paffett, John. "VHF band interference measurement, analysis and avoidance." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/2105/.

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Rohozen, Amy N. "Stars and Satellites." Kent State University Honors College / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1462107958.

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Bazard, Jean-Pierre. "Le régime juridique de la télévision par satellites." Poitiers, 1998. http://www.theses.fr/1998POIT3010.

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Les emissions de television relayees par satellites posent le probleme juridique de la liberte d'information et de la souverainete des etats. Toutes les reglementations internationales (et nationales) interdisant ou limitant la libre reception directe des emissions de television par satellites se sont revelees inefficaces. On constate, ainsi, un mouvement mondial propice a la liberte de receptiondirecte appuye par le droit europeen qui met en echec les regles des institutions internationales. La revendication de la souverainete etatique reste symbolique. La television satellitaire est favorable aux etats s'ils savent l'utiliser et s'y adapter. Les preoccupations economiques ont mis en arriere plan la question de l'interdiction de la reception directe. Cependant, il faut souligner que la liberte de reception est violee des qu'il y a cablodistribution des emissions de television satellitaire. Un nouvel ordre juridique de la television par satellites s'elabore. Il se construit grace a de nouvelles actrices comme les organisations europeennes et mondiale du commerce. Les etats doivent s'interroger sur la commercialisation mondiale des services audiovisuels qui permettrait, malgre sesinconvenients, une plus grande liberte de reception. Egalement, les acteurs prives, tels que certains exploitants de satellites, font pression pour exiger une libre reception totale. En revanche, le role des organisations internationales initiales s'estompe quelque peu. Le nouvel ordre juridique se caracterise par un droit conventionnel au plan technique et par la naissance d'une coutume internationale quant a la liberte de diffusion et de reception des emissions. Il faut rechercher l'equilibre audiovisuel entre les etats ou que ces derniers considerent que la diffusion globale des emissions de television par satellites tend vers un equilibrage satisfaisant. Alors, les etats ont tendance a accepter plus volontiers la reception directe. Les problemes juridiques poses par la television satellitaire apparaissent bien minimes compares a ceux que creeront les autoroutes de l'information.
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Books on the topic "Satellites"

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Lachenmeier, Rosa. Sequenz der Satelliten =: Sequence of satellites. Basel: BookART, 1992.

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C, Hughes Peter. Satellites harming other satellites. Ottawa, Ontario, Canada: External Affairs and International Trade Canada, 1991.

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Jefferis, David. Satellites. London: F. Watts, 1987.

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Vilela, Márcio. Satellites. Edited by Tchen, Adelaide Ginga, 1971- editor and Museu do Chiado. Lisbon]: Museu Nacional de Arte Contemporânea do Chiado, 2019.

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Chevally, Etienne. Satellites. Genève, Suisse: Editions Eliane Vernay, 1985.

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Jefferis, David. Satellites. London: F. Watts, 1987.

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Ron, Miller. Satellites. Minneapolis: Twenty-First Century Books, 2007.

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Steve, Parker. Satellites. Austin, Tex: Raintree Steck-Vaughn, 1997.

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Fox, Mary Virginia. Satellites. Tarrytown, N.Y: Benchmarks Books, 1996.

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Johnson, Rebecca L. Satellites. Minneapolis, MN: Lerner Publications, 2006.

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Book chapters on the topic "Satellites"

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Pelton, Joseph N. "Satellite Orbits for Communications Satellites." In Handbook of Satellite Applications, 93–114. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-7671-0_5.

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Pelton, Joseph N. "Satellite Orbits for Communications Satellites." In Handbook of Satellite Applications, 99–120. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-23386-4_5.

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Pelton, Joseph N. "Satellite Orbits for Communications Satellites." In Handbook of Satellite Applications, 1–22. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-6423-5_5-3.

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Inglis, Andrew F. "Satellite Program Distribution Geosynchronous Satellites." In Behind the Tube, 392–438. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003454601-8.

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Atreya, Sushil K. "Satellites." In Atmospheres and Ionospheres of the Outer Planets and Their Satellites, 145–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71394-1_7.

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Sharma, Ishan. "Satellites." In Shapes and Dynamics of Granular Minor Planets, 95–127. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40490-5_5.

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Sharma, Ishan. "Satellites." In Shapes and Dynamics of Granular Minor Planets, 207–36. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40490-5_9.

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Razani, Mohammad. "Satellites." In Commercial Space Technologies and Applications, 89–252. Second edition. | Boca Raton : Taylor & Francis, a CRC title, part of the: CRC Press, 2018. http://dx.doi.org/10.1201/9780429454585-3.

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Shim, David. "Satellites." In Visual Global Politics, 265–71. Abingdon, Oxon ; New York, NY : Routledge, 2018. | Series: Interventions: Routledge, 2018. http://dx.doi.org/10.4324/9781315856506-41.

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Bechstedt, Friedhelm. "Satellites." In Springer Series in Solid-State Sciences, 395–415. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44593-8_17.

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Conference papers on the topic "Satellites"

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Senes, Maxime, Kristen Lagadec, Baptiste Brault, and Bertrand Raffier. "A Passive Device for Postmortem Detumbling/Antitumbling of LEO Satellites, to Facilitate Active Removal." In ESA 12th International Conference on Guidance Navigation and Control and 9th International Conference on Astrodynamics Tools and Techniques. ESA, 2023. http://dx.doi.org/10.5270/esa-gnc-icatt-2023-093.

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To limit the risk of cascading collisions, we will need active debris removal missions to retrieve satellites that die before they can be deorbited. It is well understood that sudden fatal failures can cause a dead satellite to tumble uncontrollably, but it also happens that even properly decommissioned satellites are not immune to spontaneous self-tumbling due to momentum buildup from solar radiation pressure torque, making removal much more challenging. The availability of a detumbling/antitumbling device ensuring passive stabilization of dead satellites could greatly reduce the risk and cost of debris removal missions. We present a totally passive magnetic damping device attached to a satellite's structure, where a rotor fitted with magnets is free to rotate inside a metallic housing. Even if the satellite is tumbling, the rotor stays aligned with the geomagnetic field: the differential angular rate between the rotor and the satellite will create eddy currents in the housing and thus dissipate rotational energy, eventually stopping the tumbling motion. Detailed sizing and simulation activities have demonstrated that one such small (h < Phi < 5cm diameter) and lightweight (m < 100 grams) device was capable of detumbling a medium-to-large satellite (5000 kg.m² of inertia) with a detumbling time constant of a few weeks. We present the current development status, including the results of vibration tests with two representative prototypes built around two competing technologies for the rotor bearing. These steps pave the way for the final development stages of a universally available detumbling function that can be a game-changer for reducing the future burden of taking care of defunct LEO satellites.
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Einafshar, Atefeh, and Farrokh Sassani. "Modeling and Control of a Network of Cooperative Satellites Using Neural Networks." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65962.

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An adaptable control system within and on-board a network of interacting satellites is an important module which is desired for unmanned space vehicles. However, such a control system is not easy to develop since it is the core of the network’s operation and all the earth-linked operational information is reviewed and analyzed through it. Due to multipurpose missions of satellites, several decisions are made simultaneously about necessary changes to the satellite’s operational parameters (i.e., orbit, inclination, etc.). In this paper, a neural network model-based control scheme is developed for a network of interacting satellites. The proposed neural control scheme refers to a methodology in which the controller is assumed as a neural network and the dynamical model of the system is identified through the training stages of the neural model. The simulation results show that the neural control method can be effectively applied in monitoring and controlling the satellite networks, without the necessity of determining the mathematical model of the system.
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Dolgakov, I. "Ephemerides of the Neptune’s satellites." In ASTRONOMY AT THE EPOCH OF MULTIMESSENGER STUDIES. Proceedings of the VAK-2021 conference, Aug 23–28, 2021. Crossref, 2022. http://dx.doi.org/10.51194/vak2021.2022.1.1.078.

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Planetary satellite’s ephemerides are valuable for spacecraft mission planing. Moreover, precise numerical theories of thenatural satellites motion make it possible to improve the precision of their central planet’s ephemeris using the positionalobservations of their satellites. This paper describes the numerical theories of the Neptune’s satellites — Triton, Nereidand Proteus constructed using the modern CCD ground-based observations as well as space-based observations from theVoyager 2 flyby mission.
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Schutte, Aaron, and Brian Dooley. "Constrained Motion of Tethered Satellites." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84042.

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The orbital motion of tethered satellites is a highly complex nonlinear problem. This investigation sets out to formulate a new method that significantly simplifies the dynamic analysis of tethered satellite systems. This is accomplished using the fundamental equation for constrained dynamic systems, which was formulated by Udwadia and Kalaba. As a result of this new method, a study of the periodicity of tethered satellite motion is conducted and an extension to formation flying satellites is made. With varying fixed tether lengths, the system motion seems to transition from periodic to quasi-periodic. The simplified method is also applied to the computation of the control force required for formation flight.
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Meng, Jingxiong, Yan Chen, and Junfeng Zhao. "Simulator Development for Vehicle Localization Using Low Earth Orbit Satellites." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2846.

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<div class="section abstract"><div class="htmlview paragraph">This paper investigates the utilization of Low Earth Orbit (LEO) satellites for vehicle localization and conducts a comparative analysis with traditional Global Navigation Satellite Systems (GNSS)-based methods. With the rise of LEO satellite constellations, such as Starlink, LEO-based vehicle localization may offer solutions to GNSS-related challenges. With a large number of satellites and short communication distance, the LEO-based method has great potential to improve accuracy, reduce warm-up time, and provide a robust localization solution for vehicle applications. In this paper, a dedicated LEO satellite simulator is presented, adaptable to various LEO constellations, making it relevant for evolving technologies beyond older LEO systems like Orbcomm or Iridium. The simulator includes satellite trajectory generation, observable satellite identification, and vehicle localization. The LEO simulator was also seamlessly integrated with the Carla simulator for real-time online vehicle localization assessments. Comprehensive tests were conducted with the simulation tools to evaluate LEO satellite-based vehicle localization performance across different satellite counts. Results indicate the potential of LEO satellites for precise and reliable vehicle localization, even in challenging environments. Additionally, the discussion revolves around integrating diverse GNSS-based methods into the LEO simulator, offering a versatile platform for hybrid satellite-based localization research. This study underscores the promise of LEO satellites in enhancing vehicle localization accuracy and stability, contributing to autonomous driving technology and safety advancements.</div></div>
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Fitch, J. P., T. W. Lawrence, D. M. Goodman, and E. M. Johansson. "Speckle Imaging of Satellites." In Signal Recovery and Synthesis. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/srs.1992.wa1.

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We performed a series of experiments using the Air Force Maui Optical Station’s 1.6 m telescope and a bare CCD detector to capture speckle images of various satellites. The speckle images were processed with bispectral techniques for recovering image Fourier phase as well as projection onto convex sets for recovering image Fourier magnitude from the projected autocorrelation. Results of imaging point stars and binaries are shown as a baseline assessment of our technique. We have reconstructed high quality images of numerous satellites and will show reconstructions of a very familiar satellite: the Hubble Space Telescope. To our knowledge, this is the first demonstration of the use of bare CCDs for speckle imaging of relatively bright objects such as artificial satellites.
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Paul, Johns, Abdul Salam PM, Rajeev P, Santhosh J. Nalluveettil, and Jothiramalingam A. "Development of INLS 3U Uni-Pod Nano Satellite (CubeSat) Dispenser System for 3U Class Satellites." In AeroCON 2024. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-26-0458.

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<div class="section abstract"><div class="htmlview paragraph">With the present state of the art technology, size and mass of the satellites have come down. This necessitated the need for a low shock separation system that does not have mass attached to the separated satellite. Development of Nano satellites with mass of the order of 1 to 24 kg has become popular among scientific/ academic institutions for carrying out scientific experiments. INLS 3U Uni-Pod System (Nano satellite dispenser system) is a satellite dispensing system designed by ISRO for accommodating four 3U class Nano satellites in a single structure where each satellite is deployed independently by separate actuation commands. INLS stands for ISRO's Nano satellite Launch System. The INLS 3U Uni-Pod separation system successfully flown in ISRO’s Launch Vehicle mission for deployment of three satellites from abroad. CubeSat separation system consists of a structure housing the satellite, Holding and release mechanism (HDRM), rattling arresting mechanism, satellite ejection mechanism and movement arresting/ locking mechanism. The system was designed and developed for accommodating four satellites with a maximum mass of 6.0 kg, meeting the CubeSat Design Specification (CDS). Wire fusing system is used as HDRM. Helical compression spring with pusher plate is used for ejecting the satellite. Mechanism with double torsion spring is used for rattling arresting. The system was tested in ground conditions and in thermo-vacuum environment (-15°C &amp; +60°C) nearly 40 times and found meeting the design specifications. The actuation time, separation time, electrical specifications, separation velocity and rates are designed at par with the internationally available commercial systems. The satellite ejection time is within one second from command. Confirmation of satellite separation is through micro switches and reed switches. The system can be mounted in two configurations, viz rail mounting and back mounting.</div></div>
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Yun, Sang-Hyuk, Hyo-Sung Ahn, Sun-Ju Park, Ok-Chul Jung, and Dae-Won Chung. "Ground Antenna Scheduling Algorithm for Multi-Satellite Tracking." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48042.

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In this paper, we address the optimal ground antenna scheduling problem for multiple satellites when multiple satellites have visibility conflicts at a ground station. Visibility conflict occurs when multiple satellites have either overlapping visibilities at a ground station or difference with time of loss of signal (LOS) of a satellite and time of acquisition of signal (AOS) of another satellite is less than reconfiguration time of ground station. Each satellite has a priority value that is a weight function with various factors. Multi-antenna scheduling (MAS) algorithm 1 and Multi-antenna scheduling (MAS) algorithm 2 are proposed to find the optimal schedule of multi-antenna at a ground station using pre-assigned priority values of satellites. We use the depth first search (DFS) method to search the optimal schedule in MAS algorithm 1 and MAS algorithm 2. Through the simulations, we confirm the efficiency of these algorithms by comparing with greedy algorithm.
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Mihalčinová, Nikola, and Miriam Jarošová. "Meteorological satellite as an important source of meteorological information for aviation." In Práce a štúdie. University of Žilina, 2021. http://dx.doi.org/10.26552/pas.z.2021.1.15.

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This paper is focused on the use of information provided from meteorological satellites in air transport, its development and current status. The work defines general knowledge in the field of meteorology such as the history of meteorological satellites, the division of orbits and current meteorological satellites in orbits. The work also includes the characteristics of measured quantities and monitoring methods. The practical contribution of this work is the analysis of satellite images in Europe. Finally, the work deals with the future use of meteorological satellites and the development of new satellites.
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Erdmann, Tony, and Mara Krachten. "Lessons-learned from teaching satellite operations in a novel hands-on student project utilizing in-orbit spacecraft during the COVID-19 pandemic." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.062.

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The Chair of Space Technology at TU Berlin continuously develops new satellite technology and software that is verified and used in various missions in orbit. 27 satellites were launched as of 2022. Many of these satellites by far outreach their design lifetime and work until today. At the same time, an increasing number of satellites not only in the academic domain is demanding for qualified operators. Hence, some of the satellites at TU Berlin are not fully operated anymore. To enable an efficient and sustainable use of those satellites, a novel hands-on student-driven project was implemented in order to utilize these aged but functional satellites to train a new generation of satellite operators. In this lecture course, students with various backgrounds are introduced to the basics of satellite operations by student tutors. Using a laboratory model of a CubeSat as a hardware-in-the-loop operations simulation, participants can collect first experiences in the university’s own Mission Control Center (MCC). Besides theoretical and practical foundations of satellite operations they gain skills in managing and coordinating satellite missions. After finishing the basic course in a theoretical and practical operations test, students qualify to participate in the advanced project giving them the opportunity to work with and operate the available satellites in orbit under supervision. Each semester, several interdisciplinary teams conduct experiments such as Earth Observation scenarios or work on related tasks like the improvement of the operations software or Human Factors of satellite operations. The pandemic has posed new challenges to this innovative educational concept, but was also a motivation to find alternative ways to teach satellite operations. The setup of simulated operations in the MCC was transformed into a combined setup of remote access and video conference. In this way, students are enabled to practice satellite operations from home. Theoretical lectures are prepared as screencasts. Further, the advanced project work was transferred to a remote manner. Students planned satellite scenarios from home, which subsequently were conducted by the student tutors, who provided the acquired telemetry data to the participants for analysis. Among the results of the project are several images with the focus on environmental monitoring of Earth, a software update for a satellite and the continuous analysis and documentation of degradation of components that have been in orbit for many years. These achievements do not only provide exciting hands-on classes and new skills to the students but often even contribute to the institution’s research
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Reports on the topic "Satellites"

1

Heller, Thomas J. The Advantages of Commercial Satellites versus Military Satellites. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada514948.

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Kersley, L., and N. S. Wheadon. Scintillation Using NNSS Satellites. Fort Belvoir, VA: Defense Technical Information Center, January 1985. http://dx.doi.org/10.21236/ada152804.

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Boice, D. C. Existence of undiscovered Uranian satellites. Office of Scientific and Technical Information (OSTI), April 1986. http://dx.doi.org/10.2172/5928763.

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Brown, R. J., W. G. Best, and G. K. Walker. Satellites Monitor Global Vegetation Condition. Natural Resources Canada/CMSS/Information Management, 1990. http://dx.doi.org/10.4095/217658.

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Valpiani, James M., and Phillip L. Palmer. Symplectic Attitude Estimation for Small Satellites. Fort Belvoir, VA: Defense Technical Information Center, January 2006. http://dx.doi.org/10.21236/ada443061.

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Dawkins, S., D. Glover, J. Griner, D. Tran, T. Henderson, J. Heidemann, J. Touch, et al. Ongoing TCP Research Related to Satellites. Edited by M. Allman. RFC Editor, February 2000. http://dx.doi.org/10.17487/rfc2760.

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Washington, Tania M. Denying Access to Commercial Communications Satellites. Fort Belvoir, VA: Defense Technical Information Center, February 1999. http://dx.doi.org/10.21236/ada363096.

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Gaposchkin, E. M., and R. J. Bergemann. Infrared Detections of Satellites with IRAS. Fort Belvoir, VA: Defense Technical Information Center, September 1995. http://dx.doi.org/10.21236/ada537531.

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Heimann, P. A. Near threshold studies of photoelectron satellites. Office of Scientific and Technical Information (OSTI), November 1986. http://dx.doi.org/10.2172/6960970.

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Jones, Brandon A., Gabriel C. LoDolce, Ben K. Bradley, and George H. Born. Data Association Algorithms for Tracking Satellites. Fort Belvoir, VA: Defense Technical Information Center, March 2013. http://dx.doi.org/10.21236/ada582504.

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