弱GPS/GLONASS信号捕获算法研究

Acquisition algorithm of weak GPS/GLONASS signals

本文给出了GPS/GLONASS双模接收机的总体设计方案,重点对弱信号环境下的接收机信号捕获进行了讨论,采用并行码相位搜索方法和改进的循环相关算法分别对GLONASS信号和GPS信号进行捕获;并利用真实数据对双模接收机性能进行了仿真研究,重点对接收机捕获弱信号的能力,以及在不同信噪比和不同累加数据长度下的捕获概率进行了讨论,结果表明该双模接收机在不需要较长数据长度的情况下能够捕获低信噪比环境下的卫星导航信号,提高了接收机的灵敏度。

The design project of double receiver on GPS/GLONASS was given in the paper, GPS/GLONASS signals acquisition were researched in weak signal circumstance, GLONASS signals and GPS signals were acquired using parallel code phase search algorithm and circle correlation integration acquisition algorithm. Finally, performance of double receiver was simulated using real signals, the capacity of detection weak signal, and acquisition probability with different signals to noise and different data length were discussed. The results showed that double receiver could acquire satellite signals in low signals to noise circumstance with lesser data length, which improves receiver sensitivity.