自动闭塞移频信号解调的PLL仿真实现

自动闭塞移频信号实质上是一种以确定的脉冲信号为调制信号，且相位连续的频移键控信号，因此可用锁相环路（PLL）实现解调。用PLL实现解调具有性能好、成本低、便于集成等优点。本文介绍了用PLL结合单片机实现自动闭塞移频信号解调的原理和方法，并给出了实验仿真波形。

PLL Based Simulation on Demodulation of Frequency-shifting Signal of Automatic Block

The frequency-shifting signal of automatic block is a FSK signal with the certainty pulse as modulation signal, and can be demodulated with PLL. This demodulation technique possesses some merits such as good performance, low cost and convenient to integration. In this paper, the principle and the means are present, and also the experiment simulation waveforms are given.