惯性辅助GNSS跟踪环路及其适配性分析

Inertial Information Aided GNSS Tracking Loop and Its Suitability Analysis

载波跟踪技术作为GNSS接收机的关键技术,其跟踪算法在很大程度上决定着GNSS接收机的导航性能。本文基于一种典型载波跟踪环路结构,针对高动态环境下接收机跟踪环路易信号失锁的情况,设计了一种惯性辅助GNSS载波跟踪算法,提出利用多普勒频移变化量平滑伪距率算法,并对惯性辅助跟踪环路的适配性进行了分析。实验结果表明:惯性辅助GNSS载波跟踪算法适用于高动态环境,具有良好的动态性能和导航精度。

Carrier tracking technology is the key technology of GNSS receiver, and carrier trackingalgorithm mainly determines the navigation performances of GNSS receiver. Thinking of the situation thatreceiver loses satellite signals easily in high dynamic environment, a method of inertial information aidedGNSS carrier tracking algorithm, based on a typical carrier tracking loop structure, is designed, Dopplerfrequency change is used to smooth pseudo-range rate, and the suitability of tracking loop is analyzed.Results of experiment show that, the inertial information aided GNSS carrier tracking algorithm is suitablefor high dynamic environment and has good dynamic performances and navigation accuracy.