基于Q路相干-非相干积累的GPS弱信号捕获方法

GPS weak signal acquisition method based on Q-way coherent-incoherent accumulation

互相关干扰由C/A码的相关特性所引起,是全球定位系统中无法避免的问题,文中改进了Q路滤波法,优化了捕获结构,提出了基于Q路相干-非相干积累的GPS弱信号捕获方法。仿真结果表明该方法可以有效提高弱卫星信号捕获时的信噪比,比Q路滤波法约提升1dB。

The correlation interference is caused by the correlation characteristics of C/A code,which is an unavoidable problem in GPS.In this paper,the Q-way filtering method is improved,the capture structure is optimized,and the GPS weak signal acquisition method based on Q-way coherent-incoherent accumulation is proposed.Simulation results show that this method can effectively improve the signal-to-noise ratio when capturing weak satellite signals,with about 1 dB improvement over the Q-way filtering method.