Spaceborne multi-baseline holographic SAR imaging method

Abstract

The invention discloses a spaceborne multi-baseline holographic SAR imaging method, which realizes 360-degree omnibearing imaging based on multiple navigation geosynchronous orbit baselines. The method comprises the following steps: S1, an orbit model for geosynchronous orbit spaceborne holographic SAR imaging is constructed; S2, based on the orbit model and an imaging geometric model of the geosynchronous orbit spaceborne holographic SAR imaging, a geosynchronous orbit spaceborne holographic SAR echo signal model is constructed; S3, two-dimensional holographic imaging is carried out; S4, a three-dimensional imaging sparse basis is constructed through constructing an altitude sparse basis; S5, the altitude of a ground target is reconstructed by using a compressed sensing reconstruction algorithm; and S6, a holographic image is displayed. The problems that the airborne platform has a small detection range, the detection area is limited, and the holographic imaging quality is affected bythe movement of a carrier and the like can be solved.

Description

technical field [0001] The present invention relates to the field of SAR multi-dimensional imaging, in particular to a spaceborne multi-baseline holographic SAR imaging method. Background technique [0002] The current multi-baseline SAR 3D imaging technology uses a linear synthetic aperture to capture imaging data from one side of the scene. Since the scattering characteristics of the ground target will vary with the observation angles in the azimuth and elevation directions, it is difficult for the linear synthetic aperture technique to fully describe the scattering characteristics of the target. In addition, the linear synthetic aperture data acquisition mode has difficult imaging problems such as foreshortening and shadows, which bring great difficulties to the interpretation of SAR images. Based on the above, it is necessary to develop a spaceborne multi-baseline holographic SAR imaging method. Contents of the invention [0003] The purpose of the present invention ...

AI Technical Summary

Problems solved by technology

Since the scattering characteristics of the ground target will vary with the observation angle in the azimuth and elevation directions, it is difficult for the linear synthetic aperture technique to completely describe the scattering characteristics of the target

In addition, the linear synthetic aperture data acquisition mode has difficult imaging problems such as perspective shortening and shadows, which bring great difficulties to the interpretation of SAR images.

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