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卫星导航系统中伪距测量是否精确直接决定了导航接收机的定位精度。针对卫星导航系统中的伪距测量问题,介绍了伪距测量的原理,分析了伪距测量误差主要取决于钟差、电离层、对流层及多径传播效应引起的误差等,并重点针对多径效应进行分析;针对伪距测量中的多径误差,在定性给出伪距多径效应的基础上,重点对测码伪距多径误差进行了理论分析,建立了信号多径传播效应模型,通过相干超前减滞后鉴别器输出函数给出了测码伪距多径误差的表征方法;最后对测码伪距多径误差进行了仿真分析,分析了多径延时及多径幅度比对多径误差的影响,为伪距测量分析提供依据。
Pseudorange measurement in satellite navigation system directly determines the positioning accuracy of the navigation receiver. Aiming at the problem of pseudorange measurement in satellite navigation system, the principle of pseudorange measurement is introduced. The measurement error of pseudorange is mainly determined by the clock error, ionosphere, troposphere and multipath propagation error, Based on the qualitative analysis of multipath effects of pseudoranges, the multipath errors of the measured pseudoranges are analyzed theoretically, and the signal multipath propagation effect model is established. Finally, the multipath error of the measured code pseudo-range is simulated and analyzed. The effects of multi-path delay and multipath amplitude ratio to multi-path delay are analyzed Diameter error, to provide the basis for pseudorange measurement and analysis.