基于UKF准开环结构的高动态载波跟踪环路

 对高动态环境下的全球卫星导航系统（GNSS）载波信号跟踪方法进行了研究。在分析高动态载波信号模型的基础上,提出了一种基于无迹卡尔曼滤波（UKF）的准开环载波跟踪方法。此方法能够消除导航数据二进制相移键控(BPSK)调制的影响,并采用四维UKF相位估计模型提高跟踪精度,同时对估计值进行补偿以减少滤波器的滞后性。通过模拟接收机的高动态运动轨迹，从跟踪误差、跟踪结果和补偿效果3个方面,与基于卡尔曼滤波（KF）的锁频环(FLL)辅助锁相环(PLL)结构的传统跟踪方法进行比较,结果表明基于UKF的准开环跟踪方法能够有效地完成高动态环境下的载波跟踪。

Quasi-open-loop Structure for High Dynamic Carrier Tracking Based on UKF

This article presents a study of the carrier tracking loop of the global navigation satellite system (GNSS) receiver in high dynamic conditions. After analyzing the model of high dynamic signals, a quasi-open-loop carrier tracking method based on unscented Kalman filter (UKF) is proposed. This new method can eliminate the influence of binary phase shift keying(BPSK) modulation, and it adopts the four-dimensional UKF phase estimator to increase tracking precision and compensates for the estimated values to reduce the hysteresis of the filter. By simulating the high dynamic trace of a receiver, this quasi-open-loop structure is compared with the structure of frequency locked loop(FLL) assisted Kalman filter (KF) based phase locked loop(PLL) chiefly in terms of tracking errors, tracking results and compensation effect. Simulations show that the proposed quasi-open-loop structure for high dynamic carrier tracking loop based on UKF can effectively complete the task of carrier tracking in a high dynamic environment.