基于UKF准开环结构的高动态载波跟踪环路  

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

作　　者：韩帅[1] 王文静[1] 陈曦[1] 孟维晓[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,黑龙江哈尔滨150080

出　　处：《航空学报》2010年第12期2393-2399,共7页Acta Aeronautica et Astronautica Sinica

基　　金：国家"863"计划(2007AA12Z338);国家自然科学基金(60772010)

摘　　要：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。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.

关 键 词：高动态 信号处理 无迹卡尔曼滤波 频率偏移 补偿 

分 类 号：V448.2[航空宇航科学与技术—飞行器设计] TN911.8[电子电信—通信与信息系统]