A Real-Imaginary correlation method for generating a speckless interferogram of Synthetic Aperture Radar (SAR) comprises the following steps: applying a window on each of two complex images during the Interferometric Synthetic Aperture Radar (INSAR) data processing, wherein the window is a mxn (m0, n0) isoline-window or any other suitable window and is centered on each corresponding pixel in the two complex images; correlating the real parts or the imaginary parts of the data of the two images in the windows with each other to obtain their correlation coefficient C1; obtaining the correlation coefficient C1 of the real part of the first complex image with the imaginary part of the second complex image in the same way, or computing the correlation coefficient -C2 of the imaginary part of the first complex image with the real part of the second complex image, thereby obtaining C2; finally, obtaining the interferogram from the arc tangent of the ratio of C2 to C1.
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