一种基于FQFD／FLL／PLL的混合载波跟踪算法  

A Hybrid Carrier Tracking Algorithm Based on FQFD,FLL and PLL

作　　者：罗大成[1] 王仕成[1] 刘志国[1] 张金生[1] 王凯[2] 

机构地区：[1]第二炮兵工程学院,西安710025 [2]第二炮兵驻孝感地区军事代表室,湖北孝感432100

出　　处：《航天控制》2009年第1期10-14,66,共6页Aerospace Control

基　　金：国家863课题资助项目(2006AA705320)

摘　　要：载波跟踪技术是GPS软件接收机的关键技术之一,载波跟踪算法在很大程度上决定了GPS软件接收机的性能。基于一种典型载波跟踪环的结构,分析了当前载波跟踪环常用的四相鉴频器、锁频环、锁相环的工作原理及其性能,设计了一种基于三者的混合载波跟踪算法。仿真结果表明,所设计的载波跟踪算法在多普勒频率为一固定值、阶跃函数、斜坡函数和加速度函数时都能准确跟踪载波,证明所设计的载波跟踪算法行之有效。Carrier tracking is one of the key technologies of software GPS receiver. The capability of software GPS receiver is almost depended on it. According to a common structure of carrier tracking, the frequently used devices of carrier tracking such as four quadrant frequency discriminator （ FQFD ） ,frequency lock loop （FLL） and phase lock loop （PLL） are analyzed. The work principles and performance of them are validated by simulation. Based on these three devices, a new mixed carrier tracking loop is designed. The capability of the new carrier tracking is simulated and the result proved that whenever the Doppler frequency is a constant value, a step equation, a simple equation or a quadratic equation of time, the carrier can all be tracked by using the new carrier tracking loop. So it can be concluded that the new carrier tracking is effective.

关 键 词：四相鉴频器 锁频环 锁相环 载波跟踪 

分 类 号：TN973.3[电子电信—信号与信息处理]