Correlation coefficient local capping REMD adaptive filtering method for laser interference signal

Abstract

Considering the issue of noise reduction associated with Laser Doppler Interference (LDI) signal, the paper presented a correlation coefficient local capping robust empirical mode decomposition (REMD) filter algorithm for LDI laser sensor that enables more robust reconstruction of the displacement information from an LDI signal. The performance of the algorithm is studied, and it is shown that the algorithm is capable of removing high-frequency noise. Useful information can be extracted more easily by this method, and the Hilbert phase unwrapping displacement reconstructions method based on this algorithm has been experimentally validated. The experimental results show that the proposed method can improve the frequency separation performance in experiments, and is robust against noise interference.

Quality-guided mask cut method for phase unwrapping

“…A quality map is used to represent the goodness of pixels and guide the phase unwrapping process from valid pixels to invalid ones. Many phase quality maps are presented, including correlation coefficient plots in InSAR 5 , pseudo correlation coefficient map 6 , phase derivative variance map 7 . Otherwise, many studies have improved the guiding strategy.…”