针对GPSL1C信号的频段特点,文中介绍了一种改进的匹配滤波器和FFT相结合的捕获方法。该方法有效结合了串行捕获与并行捕获的优点,在减少硬件资源的同时实现了信号的快速捕获,且在MATLAB平台上实现了伪码捕获的仿真及算法性能分析。该方法能提高导航系统在复杂环境下的抗干扰能力,为特殊环境下信号伪码捕获提供参考,可用于新型的导航信号接收平台的设计中。

The improved capture method combined by matched filter and FFT is introduced, aiming at the frequency range of GPS LIC signal. This method effectively combines the advantages of serial capture and parallel acquisition, which can decrease the hardware resources and realize the rapid capture of the signals, PN code acquisition simulation and algorithm analyses can be realized on the platform of MATLAB. Hardware implementation and time sequence simulation can be done by FPGA. This method can increase the anti-interference of the navigation system in the complex environment, supply the reference for the PN code acquisition in the special environment and it can be used in the receiving platform design of the new-type navigation signals.