基于GP4020的GPS接收机软件设计

Design of software of GPS receiver based on GP4020

介绍了一种基于ARM的GPS接收机的开发过程,对接收机的软件设计和信号处理技术进行了详细的阐述,给出了软件结构和程序流程图。为了能够快速地对扩频信号进行捕获跟踪,采用了四相鉴频器、符号叉积频率跟踪算法和科斯塔斯环混合进行载波跟踪的变带宽跟踪策略。实验证明,采用本方案设计的GPS接收机能较好地完成信息提取与处理任务。

This thesis introduces the development of a GPS receiver based on ARM, describes the technique of software design and signal processing in detail, and gives out the software structure and program flow chart of GPS receiver. In order to acquire and track the spread spectrum signal rapidly, the changing band-width tracking strategy is adopted, which uses the quadrature frequency discriminator, Cross Product and Costas together to keep the carrier loop. The result shows that the software can meet the requirement for data processing of GPS receiver.