This Letter presents an efficient, fast, and straightforward two-step demodulating method based on a Gram–Schmidt (GS) orthonormalization approach. The phase-shift value has not to be known and can take any value inside the range , excluding the singular case, where it corresponds to . The proposed method is based on determining an orthonormalized interferogram basis from the two supplied interferograms using the GS method. We have applied the proposed method to simulated and experimental interferograms, obtaining satisfactory results. A complete MATLAB software package is provided at http://goo.gl/IZKF3.
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