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(guān)早減遲延時(shí)鎖定環(huán)和反正切載波跟蹤環(huán)，得出了由一般形式的誤差解析表達(dá)式導(dǎo)出的碼相和載波相位跟蹤誤差曲線。計(jì)算機(jī)仿真表明：在不同段中，跟蹤誤差包絡(luò)內(nèi)部曲線形式是不同的；C/A碼自相關(guān)副瓣對(duì)較長(zhǎng)時(shí)間相對(duì)多徑延時(shí)的碼相和載波相位跟蹤誤差有影響；采用窄相關(guān)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(guān) 鍵 詞 全球定位系統(tǒng); 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