Abstract:Carrier multipath error is the main source of error for the short-range mm-level real-time relative positioning of GNSS. Sidereal filtering based on satellite orbit repetition is an effective method of multipath mitigation. The large revisiting orbital period differences among multi-class GNSS satellites lead to the limitation of multipath mitigation based on the coordinate domain sidereal filtering. In order to solve this problem, the revisiting orbital period characteristics of different types of satellites are firstly investigated and the formula for all types of satellites are also deduced. Then the multipath mitigation algorithm based on the observation domain is discussed in details. Finally, the feasibility of this algorithm is verified by the measured real dataset. Our results show that, by the sidereal filtering based on the observation domain multipath mitigation model, GPS, BDS and GPS+BDS positioning precision is improved on average by about 42%, 38%, and 54% in the north, east, and upward components, respectively.
LI Pengbo,HU Zhigang,ZHOU Renyu et al. The Multipath Mitigation Method Based on Observation Domain and Its Application in GNSS Real-Time Deformation Monitoring[J]. jgg, 2018, 38(8): 840-845.