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.
出处
《航天控制》
CSCD
北大核心
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)
关键词
四相鉴频器
锁频环
锁相环
载波跟踪
Four-quadrant frequency discriminator
Frequency lock loop
Phase lock loop
Carrier tracking
