摘要
描述了一种新型的卫星接收机基带结构仿真与验证,基带结构设计采用双模态结构:一个仅仅用来执行搜索功能,该搜索采用频域的搜索方法;另一个执行搜索和跟踪功能,为了使搜索和跟踪使用同一基带结构,搜索采用时域的搜索方法。在基带结构验证中,码跟踪环采用简单的延迟锁定环DLL,而载波跟踪环采用二阶锁相环PLL。基于GPS中频信号采样采集实际GPS数据,对卫星接收机基带即搜索和跟踪进行了验证。测试结果证明所设计基带结构是有效的,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接收机设计提供了重要的基础。
This paper describes simulation and validation of a new GNSS receiver structure of baseband. The dual mode structure is adopted for the baseband： one is only for signal acquisition, and parallel code phase search acquisition algorithm is designed for GNSS signal acquisition; the other is for signal acquisition and tracking. The code tracking loop is a simple delay locked loop （DLL） , and the carrier tracking loop is the second order phase locked loop. Using GPS digitized intermediate frequency signal sampler, the algorithm of acquisition and tracking is validated. The results prove the correctness of the designed structure of baseband, and can do acquisition and tracking using many different levels of parameters and threshold values, which provides the user with the operation flexibility. This helps users in processing weaker signals and multipath, implement user developed algorithms and simulate ‘ what-if＇ scenarios for prototype and development.
出处
《航天控制》
CSCD
北大核心
2007年第5期62-67,共6页
Aerospace Control
关键词
卫星接收机
基带
并行码相位搜索
锁相环
GNSS receiver
Baseband
Parallel code phase search acquisition
Phase locked loop
