BDS/GPS伪距差分改正数3种内插方法的比较

摘要

Aiming at the problem that the efficiency of each interpolation method that uses the correction of reference stations to generate the user pseudo-range correction is usually influenced by the distance between the user and the reference stations, and the number of reference stations in the BDS/GPS fusion pseudo-range differential positioning, the paper analyzed the the accuracy and efficiency of inverse distance weighted interpolation method, linear interpolation method and low-order surface model under different numbers of reference stations in BDS/GPS fusion pseudo-range differential positioning, and proposed the optimal interpolation method for BDS/GPS fusion pseudo-range differential positioning.Experimental result showed that the efficiency and accuracy of BDS/GPS fusion pseudo-range differential positioning would be optimal by using the inverse distance weighted interpolation method or linear interpolation method to generate the pseudo-range correction, when the number of available reference stations near the user is not less than three and a polygon mesh could be formed with three nearer reference stations to make the user within the mesh.%针对BDS/GPS融合伪距差分定位中,利用基准站改正数生成用户伪距改正数的各内插方法效率易受用户与基准站距离远近、基准站数量等因素影响的问题,分析当基准站数不同时,反距离权重插值法、线性内插法和低次曲面模型法等3种内插方法用于BDS/GPS融合伪距差分时的定位效率和精度,并提出适合BDS/GPS融合伪距差分定位的最优内插方法.实验结果表明,当用户附近可利用的基准站数不少于3站,采用离用户较近的3个基准站构成多边形网且用户在多边形网内时,利用反距离权重插值法或线性内插法生成伪距改正数来进行BDS/GPS融合伪距差分定位,所获得的定位效率和精度更优.