一种快速精确 GPS 多径误差消除组合算法

摘要

Multipath effect is a main cause of the errors in the position by GPS .As it is impossible to directly measure the path and number of signals ,and difficult to establish a model of its attenuation extent and delay time, it is hard to predict the effect caused by multipath signal as well as reduce the errors of the GPS.Based on separate analysis , two traditional algorithms, TK and MLE , are combined into a new algorithm.While computing multipath parameter with the new algorithm , TK algorithm is used to estimate the delay path number and time of multipath signal coarse fast to make clear search dimension and reduce search range .Thus the combined algorithm has characteristics of less computation , high precision and large using scale .The result of simulation research shows that this new algorithm has a good performance in complex situations.%多径效应是影响 GPS定位精度的一个重要因素，由于多径信号的数量与路径无法确定，且其衰减幅度与延迟时间难以模型化，导致多径效应难以预测，其误差也难以消除。在分析TK和MLE两种典型算法特点的基础上，提出了一种TK-MLE组合多径参数估计算法。该算法通过使用TK算法快速粗估计多径信号延迟路径数和延迟时间，以确定MLE算法搜索维数并缩小了其搜索范围，使得组合算法具有计算量小、精度高以及适用范围更广的优点。仿真结果表明组合多径参数估计算法在复杂情况下具有良好的工作性能。