Scanning radar forward-looking imaging orientation super-resolution method

Abstract

The invention provides a scanning radar forward-looking imaging orientation super-resolution method, and belongs to the field of radar imaging. The scanning radar forward-looking imaging orientation super-resolution method aims to solve the problem that radar forward-looking imaging orientation resolution is low, and the azimuth resolution of radar forward-looking imaging is improved through a Bayesian deconvolution method. According to the scanning radar forward-looking imaging orientation super-resolution method, firstly noise obeys complex Gaussian distribution, and a target obeys laplace distribution; then under a Bayesian framework, a super-resolution problem is transformed to a convex optimization problem based on maximum a posteriori estimation; and finally the convex optimization problem is evaluated through an LBWK (linearized Bregman with kicking ) arithmetic, and azimuth super-resolution imaging is achieved. According to the scanning radar forward-looking imaging orientationsuper-resolution method, the creation is that priori distribution of the target and the noise is introduced, the matrix inverse operation is avoided in the calculating process, noise amplifying is effectively restrained, time consumption caused by the inverse operation is lowered, and thus better super-resolution performance is achieved.

Description

technical field

[0001] The invention belongs to the field of radar imaging, in particular to a scanning radar forward-looking imaging azimuth super-resolution method. Background technique

[0002] Realizing high-resolution imaging of radar forward-looking areas is of great significance in applications such as autonomous landing of aircraft, precise guidance of weapons, and disaster search and rescue. Although existing radar systems such as Synthetic Aperture Radar (SAR) and Doppler Beam Sharpening (DBS) can achieve high-resolution imaging in azimuth and distance, they cannot be used in forward-looking areas. Real-aperture scanning radar can realize forward-looking area imaging, but due to the limitation of antenna aperture, its azimuth resolution is low, which cannot meet the needs of high-resolution imaging. Although the azimuth resolution of scanning radar can be improved by increasing the antenna aperture, it is difficult to realize in practical applications due to the l...

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