北斗卫星导航系统中频信号的产生方法

IF Signal Generating Method of the BEIDOU Satellite Guiding and Positioning Navigation System

摘要:

北斗卫星中频信号在精确导航与授时、合成孔径成像等方面起着关键作用。通过对北斗卫星导航信号的特征进行分析,建立了北斗卫星中频信号的数学模型,并对该模型进行了仿真实现,进而研究了中频信号中路径延迟、噪声和多径干扰对原始北斗信号的影响。研究得到的信号数据可以为导航接收机和信号处理模块提供不同采样率的信号源码,通过这样的方法可以减少大量现场试验,缩短研发时间、降低成本。

Abstract:

The BEIDOU satellite navigation guiding and positioning system intermediate-frequency(IF) signal plays a crucial role in aspects such as pinpoint navigation, timing service, synthetic aperture imaging and so on. By analyzing the characteristic of the BEIDOU satellite navigation guiding and positioning system IF signal, a mathematical model was established. Then the model was simulated to explore influence caused by the path de. lay, the noise and the multipath interference. The signal data obtained by simulation could be used to offer the signal source in different sampling, which was necessary in the navigation receiver and the signal processing module. In this way, a large number of field tests could be reduced, so both the time and the cost could be saved.