Based labview8.6 FFT method to measure the phase difference between the two square wave signals in low signal-to-noise ratio conditions, test, amplitude measurement accuracy and phase measurement accuracy are high

Cross-correlation
.................\FFT法互相关函数子VI.vi
.................\FFT法相位差测量-仿真.vi
.................\FFT法自相关函数子VI.vi
.................\单边谱FFT子vi.vi

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