基于FPGA的卫星导航高精度定位系统设计

GNSS high accuracy positioning system design based on FPGA

针对影响高精度定位的L2信号测量困难、存在多径效应等问题,分别利用Z跟踪法、MEDLL算法和改进的环路设计实现了载波相位的高精度测量;针对卫星导航(GNSS)接收机调试过程中环路参数多、不易观测等问题,设计了一种基带和定位部分的软件调试监测系统。高精度接收机和调试监测系统共同组成了卫星导航高精度定位系统。对该系统的测试结果表明,高精度接收机性能较好,精度在1cm范围内;调试监测系统达到了辅助硬件程序调试和数据监测的目的。

The methods to solve difficulties of L2 signal measurement and multi-path effects which brought positioning error was discussed emphasized. Then high accuracy carrier phase measurement was realized by using of Z tracking algorithm, MEDLL algorithm and improved loop designed. In the process of developing and debugging GNSS receiver, there are too many loop parameters to observer, and also other problems to solve. Then the software system of base band and positioning helping for debugging, inspecting＆amp;testing was designed.High accuracy receiver and inspecting＆amp;testing system constitute GNSS high accuracy positioning system. The testing results indicate that the high accuracy satellite navigation receiver＆#39; performance was well with less than 1cm error;the purpose to assistant hardware program debugging and data inspecting was acquired.