基于鉴相器的矢量跟踪环设计

基于鉴相器的矢量跟踪环是锁定导航卫星码和载波的一种跟踪算法,这种算法适合于在弱信号环境下进行跟踪。矢量环不仅充分利用信号跟踪和导航状态解算之间的内在耦合关系,而且每一通道中采用鉴相器和锁频环结合的方式,系统一步内完成信号跟踪和导航解算任务。反馈控制量NCO是由导航滤波器和环路内部滤波器共同产生。实验表明,矢量跟踪环具有快速重捕获特性,能够在弱信号的环境下运行,比起传统环路有更小的跟踪误差。

Design of Vector Tracking Loop Based on Discriminator

The vector tracking loop algorithm based on discriminator is a tracking algorithm of keeping track of navigation satellites＇ pseudo random code and carrier. This tracking algorithm is suitable for weak signal environment. The vector tracking not only makes full use of internal coupling relationship between signal tracking and navigation mode calculating, but also uses the architectural style of combination of phase discriminator and frequency locked loop in each channel. It can finish signal tracking and naviga- tion computation tasks in one step. Using this method,tracking feedback NCO input is produced by navi- gation filter and the internal loop filter. The experimental results show that the vector tracking loop algo- rithm based on discriminator has the ability of fast reacquisition signal. It is able to run under the environ- ment of weak signal environment, and this structure also has smaller tracking errors than traditional meth- od.