GPS卫星捕捉及跟踪算法研究

为了能完成卫星定位，需要对卫星信号进行捕获、追踪。文中针对带有C/A码的L1频段的GPS信号进行定位研究，捕获能从接收的信号中粗略地估算出可见卫星的信号参数，用于帮助接收机初始化跟踪环路，并开始跟踪信号。码跟踪和载波跟踪模块则将这些参数细化，跟踪后即可解调出导航数据。仿真结果表明，算法可准确快速地从32颗卫星中捕捉和跟踪预定的卫星信号。

Research on Capture and Tracking Algorithm of GPS Satellite

The satellite positioning requires the capture and tracking of satellite signals. In this paper a C/A code of L1 band GPS signals were located. The visible satellite signal parameters that can be roughly estimated from the received signal are captured for the receiver to initialize the tracking loop and start tracking the signal. Parameter refinement is performed by the code tracking and carrier tracking module, after which the navigation data are demodulated. Simulation results show that the proposed method is accurate and fast in capturing and tracking the scheduled satellite signals from 32 satellites.