A method for single-view complex image registration of ati-sar sea surface

Abstract

The invention discloses an ATI-SAR sea surface single look complex image registration method. The ATI-SAR sea surface single look complex image registration method mainly comprises the steps of: separately selecting a matching window and a searching window in two single look complex image data blocks corresponding to front and rear antennas of an ATI-SAR; carrying out registration searching in the searching window by the matching window to obtain registration pixel deviation corresponding to a maximum correlation coefficient point, comparing the registration pixel deviation with registration pixel deviation results of other data blocks and registration deviation calculated based on system parameters, and judging whether a pixel-level error occurs in the present registration deviation; if the pixel-level error occurs, calculating an azimuth spectral range corresponding to large-scale sea waves, calculating large-scale sea wave azimuth spectra which need to be reserved and correspond to data in the matching window and the searching window according to the number of iteration times, and carrying out registration searching again after a new matching window and a new searching window are obtained; and if the pixel-level error does not occur, registering the whole data block according to the registration pixel deviation, so as to obtain a corresponding interference phase diagram.

Description

technical field [0001] The invention relates to the technical field of marine microwave remote sensing, in particular to an ATI-SAR sea surface single-view complex image registration method. Background technique [0002] Along-Track Interferometric Synthetic Aperture Radar (Along-Track Interferometric SAR, ATI-SAR) is an important means of ocean remote sensing. The interferometric phase is less dependent on the modulation transfer function of ocean waves and electromagnetic waves than SAR images, so it can better obtain ocean dynamic information, such as inversion of ocean surface currents, shallow sea terrain, internal waves, and ship wakes, etc., ATI-SAR ocean detection Related applications have been continuously developed on airborne and spaceborne platforms. [0003] ATI-SAR uses its two antennas set in the direction of platform movement to successively image the same area of ​​the sea surface, and accurate registration of the two Single Look Complex images (SLC) acquir...

AI Technical Summary

Problems solved by technology

The scattering coefficient behind the sea surface is much lower than that of the land, and the small-scale waves with higher frequencies change drastically within the synthetic aperture time, which can no longer be focused and indirectly converted into "noise", which further reduces the echo signal-to-noise ratio

When the correlation coefficient method is used to register low-correlation ocean wave textures, under the influence of noise, the quality of the interferometric phase image obtained from the pixel offset corresponding to the point with the maximum correlation coefficient is often not optimal, and pixel-level registration errors will occur. misregistration

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