消除GPS多径误差的重构相关曲线法研究

无论是单条或者多条多径信号,都会对GPS测量造成主要的和难以克服的多径误差.多径误差的直接表现就是使得GPS接收机输入信号与本地C/A码发生器复制信号的相关曲线的峰值点发生偏移.为此,以相关曲线峰值点偏移特征为研究对象,提出一种消除多径效应引起的GPS伪距测量误差的新方法.该方法通过重构相关曲线,使其峰值点与直达信号的峰值点位于同一相关延迟点上,并使二者相关码片的宽度相等,从而消除延迟锁定环(DLL)的跟踪误差.仿真结果表明,该方法简单有效.

Research on reconstructing correlation-function curve method to eliminate GPS multipath error

No matter single or multiple multi-path signals, they all can cause the crucial and insurmountable multi-path errors in the GPS measurements. The most straightforward influence produced by multi-path error is that there is an excursion of correlated curve peak points existing between the GPS receiver input signal and the local C/A code generator reproductive signal. Taking correlation-curve peak point excursion characteristics as an investigation object, a new method is proposed to eliminate the GPS pseudo-range measurement error induced by multi-path effect. Via reconstruction of the correlated curves, this method ensures that the correlation-peaks of reconstructed signal and line of sight (LOS) lie on the same delay point, and makes both signals have the same width as well, consequently get rid of the delay locked loop (DLL) tracing error. The simulation results testify that this new method is simple and efficient.