一种快速精确GPS多径误差消除组合算法  

A Fast & Precise Combined Algorithm for GPS Multipath Error Elimination

作　　者：张洋[1] 王新龙[1] 

机构地区：[1]北京航空航天大学宇航学院,北京100191

出　　处：《航空兵器》2013年第5期30-35,共6页Aero Weaponry

基　　金：国家自然科学基金(61074157);卫星应用研究院创新基金项目(2012-1517);航空科学基金(20090151004)支持项目

摘　　要：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。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 muhipath 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 muhipath 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.

关 键 词：GPS接收机 多径误差 TK算法 MLE算法 

分 类 号：V249.328[航空宇航科学与技术—飞行器设计]