Displaced phase center antenna imaging method based on lq regularization

Abstract

The invention provides a displaced phase center antenna imaging method based on lq regularization, the method constructs characteristic matrix and reconstruction matrix of a displaced phase center antenna imaging radar, according to the imaging requirement, a lq regularization model and a threshold function corresponding to the model are selected; based on the echo data of the imaging radar and the characteristic matrix and the reconstruction matrix thereof, a DPCA data processing operator is obtained; the operator is leaded in the iteration threshold operation process, and a backscattering coefficient matrix of the observed scene is calculated. According to the invention, the displaced phase center echo data acquired by non-uniformly sampling is adopted to realize unambiguous radar imaging to the observed scene; high resolution imaging work of the large spatial scale observed scene is finished, compared with the sparse microwave imaging algorithm realized by matrix-vector multiplication, the method provided by the invention costs shorter time and uses less resource; the clutter interference caused by non-uniform azimuth sampling can be effectively restrained, and the additive noise in the echo data has strong robustness.

Description

technical field [0001] The present invention relates to the technical field of sparse microwave imaging, in particular to a q Regularized Biased Phase Center Antenna Imaging Method. Background technique [0002] With the development of synthetic aperture radar technology, the practical application of microwave remote sensing in engineering has higher and higher performance requirements for modern imaging radar systems. As an effective method to achieve high-resolution and wide-swath microwave imaging, the Displaced Phase Center Antenna (DPCA) technology has been widely used in the field of high-performance synthetic aperture radar imaging. In order to obtain the optimal imaging performance, the offset phase center antenna imaging radar system usually needs to meet the uniform sampling condition that meets the requirements of the Nyquist sampling theorem in the azimuth direction, that is, the carrier platform is within the time interval between the radar system transmitting ...

AI Technical Summary

Problems solved by technology

However, when the spatial dimension of the observation scene to be reconstructed is large, the huge amount of calculation and memory loss caused by the matrix-vector multiplication operation including the observation matrix will make the existing data processor unbearable, thus limiting the ability of compressed sensing based The practical application of the offset phase center antenna imaging method in the field of high-performance synthetic aperture radar imaging

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