惯性信息辅助高动态接收机捕获问题的研究

高动态环境为GPS接收机快速捕获信号带来了困难,通过外部的惯性信息辅助,接收机能预先估算高动态栽体产生的多普勒频移,缩小频率搜索范围,减小捕获时间.本文在GPS信号捕获原理的基础上,介绍了多普勒和码偏移误差对检测概率的影响,给出了惯性信息辅助接收机捕获的方法,着重分析了GPS接收机在冷启动和温启动的情况下有惯性辅助和无惯性辅助的平均捕获时间.结果表明在高动态环境下采用惯性信息辅助GPS接收机捕获的方法可以明显地减少接收机捕获的时间,提高接收机捕获的性能.

Acquisition Issues of the High Dynamic GPS Receivers Aided by Inertial Information

Under high dynamic conditions it is not easy to acquire signal for GPS receiver.The receiver aided by inertial information can previously estimate Doppler shift,and reduce Doppler frequency bin and acquisition time.Based on the principle of GPS signal acquisition,the effect of the frequency error and the code error on probability of detection is showed.The method of acquisition aided by inertial information is also given.At last,the mean acquisition time of "cold-starting" and "warm-starting" GPS receiver aided by inertial information is analyzed.The result shows that inertial information aiding can obviously reduce mean acquisition time and increase the performance of acquisition.