摘要
载波跟踪环路设计是GPS接收机中的关键技术,载波环鉴别器的类型确定了跟踪环的类型,为了有效地防止因为数据跳变引起的鉴别误差,并且使其频率鉴别范围大,精度高,采用一种二阶锁频环(FLL)辅助三阶锁相环(PLL)的方法。通过Matlab仿真载波环路比较了两种鉴频和鉴相算法的性能。结果表明,该方法鉴别范围大,精度高,切实可行。
The design of carrier tracking loop is the key technology in GPS receiver, the types of carrier loop discriminators determine the types of tracking loop. In order to prevent the discrimination error caused by data transition, enlarge the frequency discrimination range, and improve the precision, a method of combining second order frequency locked loop （FLL） with three order phase locked loop （PLL） is introduced. The performance of the two kinds of frequency discrimination and phase discrimination algorithms are compared through the simulation of Matlab carrier loop, and the results show that the method has large discrimination range and high precision.
出处
《现代电子技术》
2011年第1期29-31,共3页
Modern Electronics Technique
关键词
全球定位系统
载波跟踪
锁相环
锁频环
GPS
carrier tracking
phase locked loop
frequency locked loop
