基于软件的GPS信号捕获跟踪算法研究

对GPS软件接收机的捕获和跟踪部分进行了研究。对于捕获模块，通过对常用串行搜索捕获算法和并行频域搜索捕获算法的比较和分析，提出了一种新型并行码相位搜索捕获算法；对于跟踪模块，提出采用非相干延迟锁相环对码进行跟踪，同时采用Costas环对载波进行跟踪；最后，从捕获和跟踪的GPS信号中提取出导航电文，并根据电文中的参数计算出了用户的位置坐标，并在Matlab中对用户的位置坐标进行了定位解算验证。

Acquisition and Tracking Algorithm for GPS Signal Based on Software

The acquisition and tracking algorithm of GPS software receiver is introduced. For the acquisition module, a new method of code phase parallel-searched acquisition algorithm is proposed by comparing and analyzing the commonly used serial-searched acquisition algorithm and frequency parallel-searched acquisition algorithm. For the tracking module, the non- coherent delay lock loop was used to track C/A code, and Costas loop was used to track carrier wave. Finally, the navigation message was extracted from the captured GPS signal, and the user＇s position coordinate was calculated by the parameters of the acquisition and tracking parts, which was tested accurately in Matlab.