基于载波辅助的GPS相对动态跟踪算法研究

Carrier-Aided GPS Relative Dynamic Tracking Algorithm

针对高动态GPS信号接收问题,深入研究了相对动态跟踪的环路算法,分析了伪码双环跟踪结构,与国外采用的近似最大似然估计(AMLE)和扩展卡尔曼滤波(EKF)算法相比,该算法采用载波辅助伪码方法将绝对动态跟踪转换为相对动态跟踪,采用低阶窄带锁相环提高伪码环路的跟踪精度,简化了技术实现复杂度.经过系统仿真验证,性能满足高动态GPS信号跟踪要求.

Aiming at the problem of high dynamic input signals for GPS receiver, a dynamic relative tracking loop algorithm is presented in this paper and the pseudo code tracking double- loop was designed. Compared with the approximate maximum likelihood estimation （AMLE） and extended Kalman filter （EKF）, the algorithm transforms the absolute dynamic tracking to relative dynamic tracking by using the carrier-aided pseudo code methods. With the use of low order and narrow band phase lock loop, the tracking precision of pseudo code loop is improved and the complexity of application is reduced. The simulation results demonstrate that the performance of proposed tracking algorithm can satisfy the demands of high dynamic GPS receivers,