Results 41 to 50 of about 2,623 (148)
Realtime Precise Orbit Determination Technology for LEO Mega-Constellation
天地一体化信息网络Supported by GNSS, it analyzed the advantages and disadvantages of solving LEO satellite orbit on the ground or onboard the satellites.The high-fidelity non-conservative force models were applied to the real-time orbit determination algorithm.To separate
Zhen LI, Chuang SHI
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AerospaceEnhanced real-time onboard orbit determination for low-Earth-orbit satellites is essential for autonomous spacecraft operations. However, the accuracy of such systems is often limited by signal propagation delays between GPS satellites and the user ...
Daero Lee, Soon Sik Hwang
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Remote Sensing, 2019 Cycle slip detection and repair are crucial for precise GPS-derived orbit determination of the low-Earth orbit (LEO) satellites. We present a new approach to detect and repair cycle slips for dual-frequency LEO satellite GPS observations.
Hui Wei +3 more
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A Refinement Method of Real-Time Ionospheric Model for China
Remote Sensing, 2020 Ionospheric delay is a crucial error source and determines the source of single-frequency precise point positioning (SF-PPP) accuracy. To meet the demands of real-time SF-PPP (RT-SF-PPP), several international global navigation satellite systems (GNSS ...
Yang Wang +3 more
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A Practical Adaptive Clock Offset Prediction Model for the Beidou-2 System
Remote Sensing, 2019 The predicted navigation satellite clock offsets are crucial to support real-time global navigation satellite system (GNSS) precise positioning applications, especially for those applications difficult to access the real-time data stream, such as the low
Beizhen Xu +5 more
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, 2023 The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Li, M. +5 more
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Precise Orbit Determination Based on the Unscented Transform for Optical Observations
Journal of Astronomy and Space Sciences, 2019 In this study, the precise orbit determination (POD) software is developed for optical observation. To improve the performance of the estimation algorithm, a nonlinear batch filter, based on the unscented transform (UT) that overcomes the disadvantages ...
Hyewon Hwang, Eunji Lee, Sang-Young Park
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Comparison of Ultra-Rapid Orbit Prediction Strategies for GPS, GLONASS, Galileo and BeiDou
Sensors, 2018 Currently, ultra-rapid orbits play an important role in the high-speed development of global navigation satellite system (GNSS) real-time applications.
Tao Geng, Peng Zhang, Wei Wang, Xin Xie
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High-Precision Time Transfer and Relative Orbital Determination Among LEO Satellites in Real Time
NAVIGATION: Journal of the Institute of NavigationFor low-Earth-orbit (LEO) satellites, high-precision clock estimation often depends on high-precision real-time global navigation satellite system (GNSS) products. Thus, service providers often choose to downlink observation data to the ground to achieve high accuracy.
Wang, K. +3 more
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Remote SensingReal-Time Precise Orbit Determination (RTPOD) of Low Earth Orbit (LEO) satellites relies primarily on onboard GNSS observations and may suffer from degraded performance when observation geometry weakens or tracking conditions deteriorate within satellite
Shengjian Zhong +6 more
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