摘要
针对传统全球定位系统(GPS)接收机在高动态环境下跟踪性能不理想,提出一种基于载波频率辅助相位的GPS信号跟踪算法。利用锁频环(FLL)辅助锁相环(PLL)的方式代替传统单一跟踪环路,通过卡尔曼(Kalman)滤波器对接收机各跟踪通道中频信号进行综合处理。根据多条跟踪通道的伪距和伪距率残差对系统状态参量进行综合估计,并搭建Kalman滤波器的状态方程和量测方程,给出了跟踪环路反馈量,与传统标量跟踪模式下的跟踪性能进行了对比。仿真结果表明,基于载波频率辅助相位的GPS信号跟踪算法进入稳态时间减小了100 ms,位置误差精度提高了5 m,速度误差精度提高了近3 m/s,在接收机用户快速运动的环境下,能够很好地处理高动态信号。
Tracking performance of traditional Global Positioning System（ GPS） receiver in high dynamic environment is not ideal, a kind of GPS signal tracking algorithm based on carrier frequency assist phase was proposed to improve it. The traditional single tracking loop was replaced by frequency lock loop assisting phase lock loop, and intermediate-frequency signals in all tracking channel of receiver were processed using Kalman filter. According to many tracking channel pseudorange and pseudorange rate residual, comprehensive estimation for system state parameters was given. The system state equation and measurement equation of the Kalman filter were created and the tracking loop feedback was given. Tracking performance of the traditional scalar tracking mode was compared with that of the proposed method. The simulation results show that the GPS signal tracking algorithm based on carrier frequency assist phase gets into the steady state with 100 ms decreasing, the precision of position error is improved by 5 m, and the precision of velocity error is improved about 3 m / s. In the fast moving environment of receiver user, it can better handle the high dynamic signal.
出处
《计算机应用》
CSCD
北大核心
2015年第4期1174-1178,共5页
journal of Computer Applications
基金
国家自然科学基金资助项目(61102107
61374208)
中央高校基本科研业务费专项资金资助项目(HEUCFX41310)
关键词
全球定位系统
高动态
跟踪环路
标量跟踪
Global Positioning System（GPS）
high dynamic
tracking loop
scalar tracking
