一种高动态环境GPS信号的跟踪方法及实现

A GPS SignaI Tracking Method and Realization for High Dynamic Application

鉴于在高动态环境跟踪ＧＰＳ信号所遇到的问题，分析了高动态环境跟踪ＧＰＳ信号的基本方法，讨论了通过延时锁定环和载波辅助技术进行伪码跟踪的原理，重点研究通过３阶频率扩展卡尔曼滤波算法（ＦＥＫＦ）进行多普勒频率估计并进行载波跟踪的原理，模拟分析了ＦＥＫＦ算法的动态跟踪能力和频率估计误差。

The problems met in high dynamic circumstance during tracking GPS signal are analyzed, and the basic methods of tracking GPS signals in this circumstance are studied too. The pseudonoise(PN) tracking theory through digital delay locked loop and carrier assistant technology is discussed. The algorithm of three order frequency extended Kalman filter(FEKF) is presented and studied emphatically for estimating the Doppler frequency and therefor tracking carrier frequency, The tracking performance and tracking error of two and three order FEKF are simulated and compared. Finally, a GPS Signal tracking scheme in high dynamic circumstance is put foreword.