摘要
介绍了基于硬件射频前端的GPS软件接收机设计与验证。针对GPS串行的搜索算法速度慢的缺点,采用了高速的并行码相位搜索算法;设计和实现了码跟踪环和载波跟踪环,并用载波环路来辅助码跟踪环路;综合考虑接收机的动态性和噪声影响,采用最优化设计思想,设计了GPS软件接收机最优环路带宽。采用GPS中频信号采样器采集实际GPS数据,对搜索和跟踪算法进行了验证。测试结果证明所设计的搜索和跟踪方法是有效的,使得用户在微弱信号处理、多路径处理和发展新的算法等方面具有更大的灵活性,为实际的高性能硬件GPS接收机设计提供的重要的基础。
The design and validation of GPS software receiver were presented. Since the serial search algorithm of GPS signal was slow, an algorithm using parallel-code phase search was designed for GPS signal acquisition. Considering the thermal noise and dynamic stress error, the optimization method was adopted to design an optimal bandwidth for GPS software receiver. A GPS digitized intermediate frequency signal sampler was used to validate the algorithm of acquisition and tracking of software receiver. The results prove the correctness of the designed methods of acquisition and tracking, and can do acquisition and tracking using many different levels of parameters and threshold values, which provides the user with the operation flexibility of. This helps users in processing weaker signals, implement user developed algorithms and simulate ＇what-if＇ scenarios for prototype and development.
出处
《中国惯性技术学报》
EI
CSCD
2007年第1期51-54,共4页
Journal of Chinese Inertial Technology
