摘要
在GPS接收机设计仿真阶段,为了测试接收机的各种性能,需要在仿真环境中产生可用于测试的GPS模拟信号。首先从原理上分析了GPS信号结构,重点讲述了C/A码的产生方法。接着分析了GPS信号的实现原理,最后利用Simulink工具设计了GPS卫星信号发生器,实现了L1波段上C/A码,P码,导航电文的调制。对于民用GPS接收机,主要捕获L1波段信号,检测本地C/A码与接收码的相差以及解调相应的导航电文。
In the design of the GPS receiver ,in order to test the performance of receiver, we need to produce GPS analog signal which can be used to test in the simulation environment. This paper first analyzes the structure of GPS signal, and then focuses on the method of generating C/A code. The paper also analyzes the implementation principle of GPS signal, the final design of the GI~ satellite signal generator, to achieve the C/A code ＋P code aml navigation message modulation on Ll band . For civilian GPS receivers, mainly to capture the LI hand signal ,detect the difference of local C/A code and receiving code, and demodulate navigation message.
出处
《科技视界》
2015年第23期155-156,共2页
Science & Technology Vision
