InSAR imaging and interference integrated processing method

Abstract

The invention provides an InSAR imaging and interference integrated processing method. The method comprises the following steps of: positioning a geographic space of an image in an absolute geographic space coordinate system, and constructing a backward projection imaging model for integrating InSAR imaging and interference height measurement; performing coherent accumulation imaging by using the backward projection model, outputting a digital orthoimage, and performing conjugate multiplication on the digital orthoimage to obtain a residual interferometric phase; performing phase filtering on the residual interferometric phase, and outputting an interferometric phase diagram. according to the interferometric phase diagram and a DEM auxiliary condition, carrying out ultra-sparse control point block joint interference calibration, and calculating an interference calibration result parameter; and establishing an elevation inversion model based on the backward projection imaging model, and inverting the ground elevation in the elevation inversion model by using the interference calibration result parameter. The method has the following remarkable advantages that: InSAR interference processing is simpler; self-registration is completed while imaging is carried out; DEM and SAR data matching is avoided; multi-scene image splicing is avoided; and output products are more friendly to users.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to an integrated processing method for InSAR imaging and interference. Background technique [0002] Synthetic Aperture Radar (SAR) synthesizes a large antenna array through platform movement, thereby greatly improving the lateral resolution and realizing two-dimensional high-resolution imaging of the ground. Synthetic Aperture Radar Interferometry (InSAR) combines SAR technology and interferometric technology, and uses the difference in the observation angle of the target to retrieve the ground elevation information through the interferometric phase difference. Due to its all-day and all-weather advantages, SAR / InSAR has broad application potential in surveying and mapping, land and resources survey, marine monitoring, forestry and other fields. [0003] With the development of SAR / InSAR towards multi-mode, high-resolution, wide survey swath, miniaturization, and ...

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Problems solved by technology

However, this kind of DEM auxiliary information does not cover the interferometric SAR processing steps such as registration, filtering, and interferometric calibration. It has not been seen that external DEM data systematically assist registration, filtering, phase unwrapping, interferometric calibration, and elevation inversion. In process interference processing, and this discrete auxiliary InSAR processing method does not fully exploit the potential of DEM auxiliary processing to a certain extent

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