惯导速度辅助下GPS接收机码环的噪声响应和动态跟踪性能分析

NOISE RESPONSE AND MANOEUVRE TRACKING PERFORMANCE ANALYSIS FOR THE GPS RECEIVER CODF LOOP AIDED BY THE INS VELOCITY

本文推导了C/A码信号相干和非相干接收的GPS接收机码环的动力学方程,分析了码环的噪声响应和动态跟踪性能对码环带宽的矛盾要求,并提出了解决矛盾的方法:惯导速度辅助。分析结果表明:窄带宽码环经精度为1nmile/h的惯导系统速度辅助后,动态跟踪误差为无辅助时的1/1000,接收机将兼有抗强干扰和跟踪高动态的性能。

This paper has deduced dynamic equations of the code loop of the GPS receiver which operates in coherent and noncnherent' manner when C/A code signal is considered. The contradictory requirements imposed on the code loop bandwidth by the noise response and manoeuvre tracking are analysed in detail as well. It is proposed that the contradiction can be solved by the velocity aiding from the inertial navigation system. The results show that if a narrow bandwidth code loop is aided by the inertial navigation system of 1nm/h accuracy, the manoeuvre tracking error will be 1/1000 as large 3.s that of without aiding, and thus both high anti-jamming and manoeuvre tracking performances can be achieved.