一种新的高灵敏度GPS信号捕获方法

摘要

针对全球定位系统(global position system,GPS)信号的高灵敏度捕获问题,提出了一种基于阵列双稳随机共振( stochastic resonance,SR)的GPS信号捕获方法.该方法首先用部分匹配滤波器对GPS信号进行分段相关预处理,并进行二次采样,得到符合阵列双稳SR系统输入要求的信号,然后应用阵列双稳SR来提高其信噪比增益,最后利用FFT谱分析技术,实现快速高灵敏度捕获GPS信号捕获.实测和仿真数据表明,该方法对于GPS信号,特别是对于微弱环境下GPS信号的捕获,性能得到了很好地改善.%Aiming at the high-sensitivity acquisition problem of global position system (GPS) signal, a new acquisition method based on array bistable stochastic resonance (SR) is proposed. After partial-matched filter and twice sampling are adopted in GPS signal pre-processing, the signal that is suitable for array bistable SR can be obtained. The signal-to-noise ratio gain is improved by means of array bistable SR. Finally, FFT spectrum analysis is adopted to realize GPS signal acquisition. From the measured data and numerical simulations, it can be concluded that, as to the acquisition of GPS signals, especially weak ones, the proposed method is much better than other typical methods in use.