GPS考虑副瓣的多径跟踪误差研究

研究了在考虑副瓣情况下的GPS多径码相跟踪误差和载波相位跟踪误差以及不同早减迟间距的影响。基于非相关早减迟延时锁定环和反正切载波跟踪环，得出了由一般形式的误差解析表达式导出的码相和载波相位跟踪误差曲线。计算机仿真表明：在不同段中，跟踪误差包络内部曲线形式是不同的；C/A码自相关副瓣对较长时间相对多径延时的码相和载波相位跟踪误差有影响；采用窄相关器不仅可以减小码相位跟踪误差，也可以减小载波相位跟踪误差。
关 键 词 全球定位系统; 多径; 副瓣; 跟踪误差

Abstract In this paper, both tracking errorsdue to multipath effects considered autocorrelation sidelobe in GPS and the effect of different early-late spacing are studied. Based on noncoherent DLL and arctan carrier PLL, the curves of tracking errors in general forms are given after a series of computing and simulation.It is shown that tracking errors are different in different regions; autocorrelation sidelobe affects the code phase and carrier phase tracking errors of the longer time reative multipath delay; a smaller early-late spacing can reduce the tracking errors both of code phase and of carrier phase.
Key words GPS; multipath; sidelobe; tracking error