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本文介绍锁相技术的一种应用——锁相解调扩展调频门限的原理和按最小均方相位误差的环路设计。具体方法有二:其一是根据调制信号谱密度,用维纳方程确定环路参数;其二是根据调制信号谱密度和选定的环路阶数确定环路参数。我们用后一种方法,以二阶环路为例,研制了24路调频解调器,进行了性能测试,并得到了初步结果。
This article describes an application of phase-locked technology - the principle of phase-locked demodulation to extend the FM threshold and the loop design to minimize the mean square phase error. There are two specific methods: one is to determine the loop parameters based on the spectral density of the modulated signal, the Wiener equation; the other is to determine the loop parameters based on the spectral density of the modulated signal and the selected loop order. We use the latter method, the second-order loop, for example, developed a 24-channel FM demodulator, conducted a performance test, and obtained preliminary results.