Arc aperture radar imaging method based on antenna phase pattern compensation and radar

Abstract

The invention relates to an arc aperture radar imaging method based on antenna phase pattern compensation and a radar. The invention discloses an arc aperture radar imaging method based on antenna phase pattern compensation. The method comprises the following steps: S1, obtaining a radar antenna phase characteristic matrix; S2, fixing an arc aperture radar at a preset position, and performing imaging network subdivision on a radar detection area; S3, calculating a distance delay, an azimuth angle and a pitch angle of each imaging pixel point; S4, calculating to obtain a phase compensation factor of each pixel point; S5, performing space-variant compensation on each imaging pixel point at the same time, and further obtaining a sub-image of the current arc synthetic aperture according to thephase compensation matrix; and S6, coherently superposing the sub-images obtained by the arc synthetic apertures to obtain a final image. Phase inconsistency compensation is performed on each formedimaging pixel point so that Arc-SAR detection is enabled to break through the limitation of the 3dB beam angle of the antenna and the Arc-SAR imaging accumulation angle can be increased.

Description

technical field [0001] The invention relates to the field of radar imaging, in particular to an arc aperture radar imaging method and radar based on antenna phase pattern compensation. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-time, all-weather, high-resolution imaging radar, which is widely used in the field of remote sensing. Since the SAR image has phase information, the non-contact and high-precision extraction of the deformation information of the imaging area can be realized through the interference processing of the SAR image sequence. In view of the above advantages of the SAR system, it has become one of the important means of ground deformation monitoring. However, traditional SAR systems are mostly carried on platforms such as satellites and aircraft, which makes the radar revisit time very long and cannot continuously monitor specific targets. Ground Based SAR (Ground Based SAR, GBSAR) is a miniaturized, low-cost SAR system that can...

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a circular aperture radar imaging method and radar based on antenna phase pattern compensation, which can solve the problem that the circular arc synthetic aperture radar azimuth resolution is limited by the antenna direction under the condition of large accumulation angle. The problem of falling due to the influence of graph inconsistency

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