基于视向矢量修正的铱星机会信号多普勒差分定位技术

Positioning technology based on signals of opportunity (SOP) from low Earth orbit (LEO) satellites is an effective complement and backup positioning solution of global navigation satellite system (GNSS). The major sources of errors to be considered in the positioning technology based on SOPs from LEO satellites are ephemeris and satellite clock errors with space-time relevance. Although the differential positioning technology can effectively reduce the above-mentioned errors, positioning error is still large in the long baseline positioning scenario due to the low orbit of the satellites. To address the afore-mentioned challenge, a differential positioning algorithm with Doppler measurements based on lines of sight correction is proposed. Simulation results show that the proposed algorithm has significantly better positioning accuracy than the basic algorithm in long baseline positioning experiments, and the effectiveness of the proposed algorithm is verified by differential positioning experiments with Doppler measurements using actual signals from Iridium satellites.