Overlapping-subaperture-based electro-optical-synergy synthetic aperture radar imaging processing method

Abstract

The invention relates to an overlapping-subaperture-based electro-optical-synergy synthetic aperture radar imaging processing method. The method comprises: step one, carrying out aperture segmentation; to be specific, carrying out aperture segmentation on SAR echo data in a synthetic aperture in an azimuth to obtain a plurality of subaperture data blocks, and carrying out phase shift pre-processing; step two, carrying out SAR data imaging processing; to be specific, modulating the subaperture data blocks to be at laser beams separately and simultaneously by using a plurality of spatial light modulators in an optical imaging module, carrying out parallel processing on the subaperture data blocks in a light domain, enabling all paths of laser beams to pass through the corresponding optical imaging modules in parallel, and completing imaging processing by the plurality of subaperture data blocks loaded on the laser beams simultaneously to obtain a plurality of low-resolution SAR images; and step three, carrying out aperture synthesis; to be specific, synthesizing the plurality of low-resolution SAR images in the light domain to obtain a high-resolution SAR image Compared with the prior art, the method has advantages of high-resolution real-time imaging, parallel optical processing, and the like.

Description

technical field [0001] The invention relates to the field of real-time imaging of synthetic aperture radar signals, in particular to a photoelectric cooperative synthetic aperture radar imaging processing method based on overlapping sub-apertures. Background technique [0002] Synthetic Aperture Radar (SAR) is a microwave imaging radar, which is widely used in military and civilian fields. SAR is an important sensor for transmitting information and intelligence, and the timeliness of imaging processing often becomes the key to making decisions. Faced with the urgent need for real-time processing, optical processing technology has been introduced into the field of SAR signal processing and has become a research hotspot. Optical processing technology itself has high-speed parallel processing capabilities, and some complex calculations in SAR signal processing can be realized only through some simple optical components. Therefore, this technology has the potential to provide r...

AI Technical Summary

Problems solved by technology

Due to the limitation of the resolution of the current spatial light modulator, it is impossible to load all the SAR data within a synthetic aperture onto the laser beam for processing at the same time.

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