北斗/惯导组合导航中伪码跟踪技术研究

Pseudo-code Tracking Technology in BD/INS Integrated Navigation

现代北斗卫星通信接收机中,单纯的伪码跟踪环已无法满足高动态、强干扰环境下的伪码同步。组合导航已成为一种发展方向,且在高动态、强干扰的环境下,传统的组合方式也无法使伪码跟踪环的性能达到最优。采用伪码跟踪环与惯导相互反馈的超紧组合方式,解决了伪码跟踪环中跟踪精度与动态性能之间的矛盾,提高了组合导航系统的稳定性。同时又在伪码跟踪环的内部增加了积分控制信号,仿真结果表明,组合方式设计增强了伪码跟踪环的环境适应能力,提高了伪码跟踪环的工作性能。

In modem BD satellite communications receiver, a simple pseudo - code tracking loop has been unable to meet pseudo - code synchronization in the environment of high dynamic, strong interference. Integrated navigation has become a development direction, and in the high dynamic, strong interference environment, the traditional com- bination cannot make pseudo - code tracking loop achieve optimal performance. In this paper, ultra - tight combina- tion of mutual feedback between pseudo - code tracking loop and INS solves the contradiction between tracking accu- racy and dynamic performance in the pseudo - code tracking loop, improves stability of the integrated navigation sys- tem, and increases integral control signal within the pseudo - code tracking loop. Simulation results show that this design can enhance environmental adaptability of the pseudo - code tracking loop and improve the performance of pseudo - code tracking loop.