极弱卫星导航信号精确跟踪方法研究

A Study of the Accurately Tracking Method for Very Week Navigation Satellite Signal

针对全球卫星导航系统卫星普遍存在当卫星轨道高度较高时卫星信号较低的现象,传统载波跟踪环路检测概率低的问题,提出了一种采用基于Duffing混沌振子的多普勒检测与补偿的载波精确跟踪方法。同时针对跟踪环路检测时间较小,失锁概率较大问题,提出了一种考虑电文反转的极弱信号码精确跟踪方法,文中分别阐述方法的原理及跟踪极弱信号的过程,最后使用北斗卫星导航系统数据进行动态数据验证,结果表明新方法能够解决极弱卫星导航信号的正确跟踪的问题。

In view of that GNSS satellites had a common phenomenon that The higher the altitude, the lower the satellite signal, and low probability of the traditional carrier tracking loop detection, a method of carrier precision tracking which was based on Doppler detection and compensation of Doffing chaotic oscillator was put forward in this study. At the same time, in the view of the problem that the time of tracking loop testing was lesser and probability of failure was very bigger, precision tracking method of a consideration of cables extremely weak signal was suggested. Firstly, the principle of method and the process of tracking very weak signal were elaborated respectively in this paper, finally data of BDS was used to dynamic data validating. The result proved that the new method could solve the problem of extremely week GNSS signal tracking correctly.