高动态GPS接收机环路跟踪技术研究

为了解决加速度45g、加加速度10g/s的高动态环境下GPS信号的载波跟踪、码跟踪及其精度问题,提出了一种综合考虑动态和精度性能的载波环和码环优化设计方案,探讨了高动态情况下载波环和码环的结构设计及捕获转跟踪技术,分析了FLL/PLL/DLL环路的动态应力、暂态响应和鉴别器特性,总结了实用的控制策略和环路带宽。该方案经自主开发的软件接收机测试验证,可以在达到很高动态特性的同时满足一定的测距精度和定位精度要求。

Research on High Dynamic GPS Receiver Loop Tracking

To solve such problems as carrier tracking,code tracking and accuracy of GPS signals in high dynamic environment when acceleration is not less than 45g and jerk dynamics reach is not less than 10g/s,an optimal design of carrier and code loops is put forward to meet both dynamic performance and accuracy.This paper discusses the structure of carrier and code loops and the technology transformation from the state acquisition to track in high dynamics and analyzes dynamic stress of FLL/PLL/DLL,transient response and discriminator features.It summarizes a practical control way and loop bandwidth.This scheme can achieve good dynamic performance and also satisfy certain pseudo range accuracy and positioning accuracy,which has been validated through the self-developed software receiver.