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High precision phase measurement using adaptive sampling

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1 Author(s)
Mahmud, S.M. ; Dept. of Electr. & Comput. Eng., Wayne State Univ., Detroit, MI, USA

The conventional phase measurement techniques introduce error in the phase when the input signals are distorted by harmonics. A novel technique, known as adaptive sampling, for high-precision phase measurement is introduced. A digital signal-processing approach is used in this technique. The maximum sampling rate required for this technique is h+2 samples/cycle of the input signals, i.e. (h+2) f sampless, where h, is the highest harmonic present in the signals and f is the fundamental frequency of the signals. This sampling rate is way below the Nyquist sampling rate (more than 2hf samples/s) when h is a large number. In the adaptive sampling technique the sampling rate is started from three samples/cycle and then is gradually increased until the phase is correctly measured. This phase measurement technique has been verified using synthesized signals

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Instrumentation and Measurement, IEEE Transactions on  (Volume:38 ,  Issue: 5 )