一种新的GPS多径抑制方法

随着GPS(全球定位系统)技术的广泛应用,人们对GPS的定位精度提出了越来越高的要求,有的已经要求达到cm甚至mm级。差分GPS系统虽然可以消除大部分定位误差,提高定位精度,但是还是无法消除多径信号引起的定位误差。介绍了GPS中多径信号的影响,分析了TK算法和多径监视(MPI)算法抑制多径的优缺点。通过将这2种算法级联,提出了一种新的混合方法(TK-MPI算法),并且取得了更好的定位精度,特别是在低信噪比的情况下具有很好的效果。

A New GPS Multipath Mitigation Technique

As Global Positioning System(GPS)has found wide applications in more fields,the higher GPS position precision is required,even in the centimeter level or millimeter level.Though the differential GPS system can mitigate most errors to improve the position precision,it can not mitigate the error caused by multipath signals.The impact of multipath signals in GPS is introduced,and the advantages and disadvantages of two multipath mitigation techniques are analyzed,based on TK algorithm and Multipath Indicator(MPI)algorithm respectively.A new combining technique(TK-MPI algorithm)by cascading TK and MPI algorithm is proposed,and it achieves better precision of position,especially having a good performance in case of low signal-to-noise ratio.