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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。
In order to meet the need of navigation in low signal-to-noise ratio environment, this paper analyzes the weak GPS signal acquisition algorithm in low signal-to-noise ratio environment, and focuses on the signal processing flow of correlated accumulation, non-correlated accumulation and multiple data bits cyclic cumulative acquisition algorithm Algorithm capture performance is discussed. Obtain the real GPS signal through the specific hardware device, and use Matlab to carry on the computer emulation research to these three commonly used weak GPS signal acquisition algorithms. According to the theoretical analysis and simulation results, it can be seen that the multiple data bit cyclic correlation acquisition algorithm is more suitable for detecting GPS signals under low SNR environment.