基于LabVIEW的数字相敏检波器实现

Implementation of digital phase sensitivity detector base on LabVIEW

根据数字相敏检波的原理,在LabVIEW环境实现了数字相敏检波算法,并分析了算法性能。实验结果表明,整周期采样时,信噪比低至-20dB时的幅度误差小于0.2%,相位误差小于0.7%。为进一步验证,还利用NI公司的波形生成卡和数据采集卡模拟了数字相敏检波在实际中的应用效果。

According to the principle of digital phase sensitive detection,the phase sensitive detection algorithm is implemented in Labview environment and the algorithm performance is analyzed.The experiment shows that in the condition of full period sampling,when the signal-to-noise ratio is lowered to-20 dB,the amplitude error is less than 0.2% and the phase error is less than 0.7%.For further verification,the waveform generation card and data sampling card of NI（National Instruments） Company were used to simulate the real application in the phase sensitive detection.