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。本文基于一种典型载波跟踪环的结构,分析了锁相环(PLL)的工作原理及动态性能,并在此基础上设计了一种INS辅助的GPS载波跟踪算法.仿真结果表明和PLL相比,所设计的INS辅助GPS载波跟踪算法能够在保证GPS载波跟踪环路滤波器带宽足够窄的情况下,可以有效地增加环路带宽,从而加大了环路捕获带宽,提高了环路的捕获性能;所设计的INS辅助GPS载波跟踪算法适用于机动性较高的载体。
Carrier tracking is one of the key technologies of software GPS receiver. The capability of software GPS receiver is mainly depended on carrier tracking algorithm. According to a common structure of carrier tracking, the work principles of a common INS aided GPS carrier tracking algorithm is analyzed. Then an improved tracking algorithm is presented. The capability of the new carrier＇tracking algorithm is simulated and the result proves that the new algorithm can overcome the shortage of common INS aided GPS tracking algorithm. Compared with pure carrier tracking loop, the new algorithm can ensure the bandwidth of loop filter as narrow as enough, and enhanced the bandwidth of the whole loop. Therefore, it can be concluded that the new carrier tracking algorithm is adapted for high dynamic carrier.
出处
《航天控制》
CSCD
北大核心
2009年第3期65-71,共7页
Aerospace Control
关键词
高动态
锁相环
载波跟踪算法
High dynamic
Phase locked loop
Carrier tracking algorithm
