Frequency Measurement Method of Phase Modulation Signal Based on Oscilloscope
In base of low cost,aiming at oscilloscope measuring frequency of low and medium frequency phase modulation signal,three kinds of measurement methods for phase modulation signal are proposed.The period is used to acquire the signal frequency by means of a time-domain frequency measurement technique,whereas the frequency domain for FFT is obtained through a frequency-domain method.Average sampling frequency measurement method makes the time domain signal in time domain average to get the period to obtain the signal frequency.Through theory analysis and experiment contract,the problem of the great error in the measurement based on the phase modulation frequency measurement by oscilloscope is solved.The results show that the average sampling frequency measurement method is the optimal method for frequency measurement of phase modulation signal by oscilloscope.
frequency measurementphase modulation signaloscilloscope
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