Satellite-borne InSAR (Interferometric Synthetic Aperture Radar) long-short baseline image joint registration method

Abstract

The invention discloses a satellite-borne InSAR (Interferometric Synthetic Aperture Radar) long-short baseline image joint registration method, which comprises the steps of S1, inverting three-dimensional coordinate information of ground points in an imaging region by using two SAR images under a short baseline; S2, selecting characteristic pixels of a short baseline main image, substituting ground three-dimensional coordinates corresponding to each characteristic point and satellite parameters of a long baseline image into a Doppler equation, and searching an optimal solution meeting imaging conditions; S3, solving an azimuth pixel position and a range pixel position of each characteristic point in the long baseline SAR image; S4, carrying out polynomial fitting on the azimuth and range offset of the characteristic points in the long baseline image by taking the pixel positions of the characteristic points in the short baseline main image as a benchmark so as to acquire the offset of each pixel; and S5, carrying out interpolation and resampling processing on the long baseline SAR image by using the offset acquired in the step S4 so as to finally generate a registered image which is consistent with the short baseline main image in size.

Description

technical field [0001] The present invention relates to the field of space-borne synthetic aperture radar interference processing, in particular to a long and short baseline image joint registration method for interferometric synthetic aperture radar (InSAR for short). Background technique [0002] InSAR technology mainly uses two or more SAR images of the same surveying and mapping area, and obtains the phase difference between different signals after interference processing, and uses the quantitative relationship between the phase difference and the elevation information to obtain the terrain elevation information of the scene. Therefore, InSAR technology not only maintains the imaging characteristics of SAR, but also generates new characteristics according to its coherent characteristics. In order to extract the effective interferometric phase from the interferometric complex image, the two acquired SAR images need to be registered before interferometric processing. [0...

AI Technical Summary

Problems solved by technology

However, for the SAR images acquired by the spaceborne InSAR system under different baselines, due to factors such as severe temporal decoherence and large differences in imaging angles, the two SAR images are prone to image noise, rotation, stretching, etc. image registration

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