载波相位辅助消除伪码多径误差的算法研究(英文)

Study on Code Multi-Path Mitigation by Phase-Aided Smoothing Algorithm

随着差分技术的发展,影响卫星导航接收机定位精度的典型误差源大多被消除,而多路径效应仍然是造成接收机定位误差的主要因素。该文分析了多路径效应对伪码测量量和载波相位测量量的影响。利用载波多路径误差源小于伪码多路径误差的性质,提出了一种针对伪码接收机的低复杂度的载波辅助伪码抗多径算法,并对算法进行了深入讨论和分析。该算法将接收机伪码测量量中的多路径误差由数十米减小到亚米级,大大提高了伪码接收机的定位精度。系统仿真证明了该算法的正确性。

With the progress of the differential technology, typical error source of global navigation satellite system （GNSS） receivers have been greatly reduced, while the multi-path ranging error remains the dominant one. To address this problem, the multi-path effects on code measurements and carrier-phase measurements are first analyzed in this paper. A low complexity code multi-path mitigation algorithm for the C/A code receivers based on the carrier-aided smoothing is then introduced and detailed. The code multi-path error is reduced from tens of meters to sub-meter and the C/A code GNSS receiver positioning accuracy is thus greatly improved. System simulation validates the proposed method.