Initial Signal-in-Space Assessment of Beidou Satellite Navigation System
1 College of Defense Engineering，PLA University of Science and Technology, 1 Haifu Lane, Nanjing 210007, China
2 State Key Laboratory of Geographic Information Engineering, 1 Yanta Road, Xi’an 710054, China
3 The Second Artillery Engineering University, 2 Tongxin Road, Xi’an 710000, China
Abstract：For signal-in-space accuracy assessment of the BDS regional satellite navigation system, this paper analyzes the use of precise ephemeris algorithms for spatial signal evaluation and the projection principle of SISURE. Further, it discusses the parameters for BDS of different constellations. In the examples, this paper estimates the signal-in-space accuracy in BDS of various satellites, and finds that the average SISURE grated error reaches 1.54 m, and that there is still a gap between BDS and GPS. This paper also analyzes larger signal-in-space errors of some satellite components and finds some important conclusions.
