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GPS生成C/A

于 2022-01-25 发布 文件大小:1.65 kB
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卫星信号的动态变化包含两个含义:一是由于多普勒效应会引起载波频率发生动态偏移;二是C/A码的相位会随着伪卫星与接收机间距离的变化而改变。因此信号处理必须克服掉这些影响,才能保证在捕获到信号之后持续、准确地获取导航信息。一般认为,跟踪一个信号频率的基本方法就是在输入信号频率附近建立一个窄带滤波器并跟随输入信号。换句话说,当输入信号的频率随时间变化时,窄带滤波器的中心频率也必须跟随输入信号的频率变化而变化。然而,在实际跟踪过程中,窄带滤波器的中心频率是固定的,采用生成信号来跟随输入信号的频率。输入信号的相位与本地生成信号的相位经过相位比较器后,输出结果再通过一个窄带滤波器。由于跟踪电路的带宽非常窄,因而其灵敏度相对于捕获过程要高的多。

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