弱GPS信号捕获算法的仿真实验研究

针对低信噪比环境下导航的需要,文章对低信噪比环境下弱GPS信号捕获算法进行了分析,重点对相关累加、非相关累加以及多重数据位循环相关累加捕获算法的信号处理流程和算法捕获性能进行讨论。通过特定的硬件装置获得真实的GPS信号,利用Matlab对上述3种常用的弱GPS信号捕获算法进行计算机仿真研究。根据理论分析和仿真结果可以看出,多重数据位循环相关捕获算法更适合检测低信噪比环境下的GPS信号。

Study on simulation based on weak GPS signals acquisition algorithm

Weak GPS signals acquisition algorithm in low signal to noise ratio environment was studied in the paper,signals process flow and acquisition performance of algorithm,such as coherent integration,non-coherent integration,circular correlation with multiple data bits were discussed in detail.The real GPS signals were obtained by means of the special hardware equipment,weak GPS signals acquisition algorithms were simulated using Matlab.It could be seen from theoretical analysis and simulation that circular correlation with multiple data bits would be capable of detecting GPS signals in low signal to noise ratio environment.