Interferometric Processing Shipborne Radar Array Deformation Error Compensation and Target Detection Method

Abstract

The present disclosure provides a method for interference processing boatborne radar array deformation error compensation and target detection, including: step S1, using two simultaneous array echo data to perform real-aperture imaging of ground object scenes or moving targets; step S2, Perform interference processing on two two-dimensional complex images to remove the phase of the array deformation error; step S3, establish the relationship between the echo signal-reference phase and the complex image frequency domain coefficient vector product; step S4, use the l1 norm optimization criterion Solve the relational expression to reconstruct the image; step S5, inverse transform to the space domain to obtain the two-dimensional image after the compensation of the array deformation error; in the ground imaging mode, the frequency domain low-pass filtering process can also be performed on the two-dimensional spectrum of the complex image after interference, Inverse transform to the space domain to obtain the 3D image of the ground object scene. The disclosed method obtains a well-focused ground imaging result, can remove the defocus effect caused by target movement, and improves radar target detection performance.

Description

technical field [0001] The present disclosure relates to the fields of radar imaging processing and moving target detection, and in particular, to a method for compensating deformation error of a shipborne radar conformal array and a moving target imaging detection method based on interference processing and compressed sensing. Background technique [0002] Stratospheric airships have broad application prospects in the fields of high-altitude reconnaissance, regional early warning, and communication services because of their high-altitude resident characteristics. The huge volume of the stratospheric airship provides conditions for the use of large-scale antennas to achieve real-aperture imaging (see Li Liechen, Li Daojing, Huang Pingping. Real-aperture imaging of ship-borne sparse array antenna radar based on transform-domain sparse compressed sensing[J]. Acta Radar, 2016, 5(1):109-117). Due to the larger size of the airship, the size of the array antenna is also larger. ...

AI Technical Summary

Problems solved by technology

Due to the small RCS of the moving target and the uncertain trajectory, its echo characteristics are more complex than those of stationary ground objects, and there are also phenomena such as target flickering during radar irradiation, coupled with background clutter, system noise, and human interference. etc., making moving target detection one of the difficulties in the field of radar imaging

Images