软件定义的GNSS反射信号接收机设计

分析了导航卫星反射信号的特点,给出了反射信号软件接收机的总体结构及其主要模块,主要包括接收直射和反射信号的天线、射频前端和高速A/D变换器,以及数据处理用的计算机.重点介绍了反射信号处理的基本过程,其中主要讨论了本地反射信号C/A码的生成模式,在此基础上分析了反射信号相关功率的计算方法,并给出了具体的仿真计算实例.设计了反射信号处理的具体实现软件,包括详细的流程图,关键参数和主要函数的定义及用户界面,利用实际采集的数据进行了验证,结果表明所设计的反射信号接收机运行稳定,能根据用户输入的不同参数提供导航卫星反射信号的相关功率输出.

Software defined GNSS reflections receiver design

The characteristics of navigation satellite reflected signal was analyzed. Both the architecture and the components for GNSS (global navigation satellite system) reflections receiver were presented including the two antennas, two RF (radio frequency) front ends, two high speed A/D converter and the computer for data processing. The basic reflections processing workflow was elaborated on, where C/A code generation for the reflected signal was mainly discussed following the correlation power computation with one simulation example. The software was designed and its detailed flowchart, key parameters and functions definition, user interface were also proposed. Field test data were feed into the designed software receiver, and the displayed result show that the receiver runs stably. And it can give correlation power with user defined different parameters.