参考信号频率自调整的数字相敏检波器算法的研究

Study on the DPSD Algorithm Automatically Adjusting the Frequency of Reference Signal

本文提出了一种不需要外接同频参考信号的数字相敏检波器算法。该算法首先提取计算机产生的参考信号与被测信号频率的差值，然后根据该差值调整参考信号的频率直到满足要求。本文还讨论了数字相敏检波器的幅频特性，仿真试验表明理论分析与实际结果是一致的。该算法可以用于同频参考信号不能获得时正弦信号的幅度和相位测量。

A DPSD algorithm which doesn't require a reference signal of the same frequency is proposed in this paper. This algorithm first attains the difference value between the frequencies of the detected sinusoid and the reference signal produced by computer, then adjusts the frequency of the reference signal according to the difference. This paper also discusses the frequency amplitude specialty of DPSD algorithm, simulation results coincide with the theoretical analysis. This algorithm can be used for the measurement of the amplitude and phase of the sinusoid when the reference signal of the same frequency can't be attained.