【摘 要】
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LEO spacecraft relative navigation method based on Beidou measurement are researched.A series of tri-frequency combinations have been investigated with the purpose to improve the success rate of doubl
【机 构】
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Key Laboratory of Space Utilization, Technology and Engineering Center for Space Utilization, Chines
论文部分内容阅读
LEO spacecraft relative navigation method based on Beidou measurement are researched.A series of tri-frequency combinations have been investigated with the purpose to improve the success rate of double-difference carrier phase ambiguity fixing and relative navigation accuracy.The process algorithms for two kinds of approaches,the kinematic relative navigation approach and dynamic relative navigation approach,are investigated.The ambiguity fixing performance and relative navigation accuracy are validated using the simulated Beidou-2 regional navigation system scenario.The results showed that the single frequency and wide-lane combination ambiguity fixed rate drops rapidly with increasing baseline length,but S0 ultra-wide-lane combination ambiguity can be 100% accurately resolved under three different baseline lengths.Concern the relative navigation accuracy,single frequency carrier phase especially B1 carrier phase relative positioning accuracy is highest for short baseline.With the increase of baseline length,the advantage of Beidou multi-frequency ionospheric-free combination gradually revealed: when the baseline length increased to 220 km,the relative positioning accuracy of ionospheric-free combination can increase by about 75% at most.
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