GPS载波跟踪算法分析与仿真

GPS Carrier Tracking Algorithm Analysis and Simulations

针对接收机对定位精度和动态性的需求,文中分析了二阶锁频环辅助三阶锁相环算法。首先仿真分析了不同鉴频算法和鉴相算法的性能,确定了拟采用的鉴频算法和鉴相算法。而后给出了二阶锁频环和三阶锁相环的结构,最后仿真对比分析了二阶锁频环、三阶锁相环以及二阶锁频环辅助三阶锁相环的性能。仿真结果表明二阶锁频环辅助三阶锁相环能够充分发挥锁频环和锁相环的优点,避免其缺点,在获得较高动态性的同时能够获得较高的跟踪精度。

In view of positioning accuracy and dynamic demanded by receiver, second-order frequency-locked loop with third-order phase- locked loop algorithm was analyzed. First, different frequency discriminator algorithms and different phase discriminator algorithms were analyzed and simulated. Based on this, the frequency discriminator algorithms and phase discriminator algorithms to be adopted were deter- mined. Then the second-order frequency-locked loop structure and the third-order phase-locked loop structure were given. The performances of the second-order frequency-locked loop, the third-order phase-locked loop and the second-order frequency-locked loop with thirdorder phase-locked loop were simulated. The simulation results show that the second-order frequency-locked loop with third-order phaselocked loop gives full play FLL and PLL advantages and avoids its disadvantages. It can achieve higher dynamic and higher tracking accuracy at the same time.