Abstract: In order to improve the subdivision accuracy of the photoelectric encoder and realize the compensation
and correction of the Moire fringe signal, the source of the error that affects the signal quality is analyzed, and
the waveform equation of the Moire fringe signal is established. And a method using the cuckoo search algorithm
combined with the least square method is designed, and using the residual sum of squares as the fitness function
to realize the multi-parameter identification of the waveform equation. And the sinusoidal deviation, DC(Direct
Current) component and amplitude deviation in the signal are corrected by using the identified parameters and
the waveform equation. The identified phase parameters are used to construct a look-up table to compensate the
orthogonality deviation of the signal. The experimental results show that the method effectively reduces the
deviation in the output signal and improves the subdivision accuracy of the photoelectric encoder.

Key words: Moire fringe signal; , cuckoo search algorithm; , signal processing; , error compensation