研究了在考慮副瓣情況下的GPS多徑碼相跟蹤誤差和載波相位跟蹤誤差以及不同早減遲間距的影響。基于非相關早減遲延時鎖定環和反正切載波跟蹤環，得出了由一般形式的誤差解析表達式導出的碼相和載波相位跟蹤誤差曲線。計算機仿真表明：在不同段中，跟蹤誤差包絡內部曲線形式是不同的；C/A碼自相關副瓣對較長時間相對多徑延時的碼相和載波相位跟蹤誤差有影響；采用窄相關器不僅可以減小碼相位跟蹤誤差，也可以減小載波相位跟蹤誤差。
關 鍵 詞 全球定位系統; 多徑; 副瓣; 跟蹤誤差

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