Compass precise orbit determination based on space-ground monitoring network

A way of orbit determination based on inter-satellite cross-layer observations is proposed. It classifies satellite orbits into various layers by their heights and if a receiver is set in MEO satellite, observations can be received from GEO and IGSO. According to the satellite constellation of the Chinese Compass satellite navigation system, precise orbit determination is carried out with satellite-ground observations (SGO), on the combination of satellite-ground and inter-satellite cross-layer observations (CLO), and on the combination of satellite-ground and inter-satellite two-way ranging observations (TWRO) in the condition of regionally-distributed ground stations and global unevenly-distributed ground stations. The orbit results are assessed by satellite tracked arcs, position dilution of precision (PDOD), comparing the estimated orbits with the simulated reference orbits. The results show that with only 1 d SGOs from the seven regional stations in China, RMS_3Dof GEOs, IGSOs and MEOs are respectively reduced from 6.1 m, 1.3 m and 5.9 m to 1.0 m, 0.8 m and 2.0 m when CLOs, where the beam angle of ranging equipment increases up to 41.25°, orbit accuracies are better than 20 cm when TWROs, where the beam angle increases up to 45° and systemic error is period term with 30 cm amplitude.