Results 21 to 30 of about 1,818,861 (299)
IEEE Access, 2023 Massive global Low Earth Orbit (LEO) constellations have been developed rapidly with the characteristics of larger number and shorter orbital periods of LEO satellites in recent years.
Shuren Guo +6 more
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Orbit Determination Using Angle-Only Data for MEO & GEO Satellite and Obsolete [PDF]
Journal of Astronomy and Space Sciences, 2009 We used an optical observation system with a 0.6m wide-field telescope and 5 computers system in KASI (Korean Astronomy and Space Science Institute) for satellite optical observation.
Jin Choi +6 more
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Assessment of numerical differentiation methods for kinematic orbit solution of the GRACE mission [PDF]
, 2013 textThe historical method of precise orbit determination is a dynamic approach. However, with the improvement of GPS tracking data and associated tracking networks, two newer methods have been developed: reduced-dynamic and kinematic.
Krishnan, Sandeep Kalyanapuram
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Uncertainty Analysis of the Short-Arc Initial Orbit Determination
IEEE Access, 2020 The solution of the short-arc angles-only orbit determination problem has large uncertainty because the topocentric range is not observable. For a certain angular observation tracklet with measurement noise, there exist numerous potential orbits, all of ...
Xuefeng Tao +4 more
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Effect of lunar gravity models on Chang'E-2 orbit determination using VLBI tracking data
Geodesy and Geodynamics, 2016 The precise orbit determination of Chang'E-2 is the most important issue for successful mission and scientific applications, while the lunar gravity field model with big uncertainties has large effect on Chang'E-2 orbit determination.
Erhu Wei +3 more
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Remote Sensing, 2019 This paper describes the sensitivity of both the orbital frame domain selection and the gravity model on the performance of on-board real-time orbit determination.
Eunhyouek Kim +2 more
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Sensors, 2018 For ultra-rapid orbits provided by the Global Navigation Satellite System (GNSS), the key parameters, accuracy and timeliness, must be taken into consideration in real-time and near real-time applications.
Qianxin Wang, Chao Hu, Ya Mao
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Asteroid impact monitoring [PDF]
Serbian Astronomical Journal, 2006 Some asteroids and comets with Earth-crossing orbit may impact our planet, thus we need to be able to identify the cases which could have a dangerous close approach within a century.
Milani A.
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Remote Sensing, 2022 The autonomous orbit determination of the navigation constellation uses only bidirectional ranging data of the inter-satellite link for data processing.
Wei Zhou +5 more
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Remote SensingSpace-based opportunistic positioning is a crucial component of resilient positioning, navigation, and timing (PNT) systems, and it requires the acquisition of orbit information for non-cooperative low Earth orbit (LEO) satellites.
Ruofan Deng, Honglei Qin, Yu Zhang
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