Amplitude and phase shift correction of the signal derivative based on the correction coefficients table
DOI:
https://doi.org/10.24136/jaeee.2025.015Keywords:
data correction, error correction, measuring signal correction, phase shiftAbstract
The article presents a method for correcting the derivative of a measurement signal, where the measurement error results from the signal being processed by the measurement system, altering its amplitude and phase shift. The measured values are modified using a correction coefficient that depends on the increment between successive signal values. The coefficient can be stored in the memory of a microprocessor-based sensor or another DSP system. The correction coefficient values, stored in a lookup table, are determined in advance through laboratory testing by comparing the response of a reference signal with that of the measured signal. Sample correction results are shown for a sinusoidal signal, where the phase shift is −10°, and the amplitude is 1.2 times greater than that of the reference signal. After applying the correction, the median relative error decreased from approximately −18% to negligibly small values.
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