Radar foresight super-resolution imaging method

Abstract

The invention discloses a radar foresight super-resolution imaging method which specifically includes: distance toward pulse compression, distance walking corrosion, distance toward inverse fast fourier transform (IFFT), determination of iterations and azimuth deconvolution. The radar foresight super-resolution imaging method performs azimuth modeling on echo scanned by a radar antenna in foresight mode to enable the echo to be in convolution, and estimates front ground feature distribution information in a deconvolution method; and additionally, based on noise statistical property, optimum iterations can be determined according to iteration deconvolution, so that radar can obtain better foresight super-resolution imaging performance. Compared with the background technology, the radar foresight super-resolution imaging method overcomes the restrains on scene of a single-pulse imaging technology and limitation on platform dimension of an array imaging method, further solves the problems of complex synchronization, motion compensation and the like of double-foundation synthetic aperture radar (SAR) and can effectively obtain ground feature distribution information of the area dead ahead the platform.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a radar forward-looking super-resolution imaging method suitable for a moving platform. Background technique [0002] Radar forward-looking imaging refers to obtaining the distribution information of ground objects in the area directly in front of the platform. The development of radar forward-looking imaging capabilities on moving platforms is conducive to improving pilots' judgment and identification of distant terrain and the platform's autonomous navigation capabilities, improving the platform's reconnaissance, surveillance, positioning and identification capabilities, and enabling accurate positioning of airdrop locations. The fields of autonomous landing, autonomous navigation and forward-looking reconnaissance are of great significance. [0003] At present, in the process of imaging the ground by the radar on the moving platform, the high resolution in t...

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Problems solved by technology

[0004] For forward-looking imaging of moving platform radar, especially how to improve the azimuth resolution, the document "Airborne Radar Single-Pulse Forward-Look Imaging Algorithm, Chinese Journal of Image and Graphics, 2010, 15 (3): P462-469" adopts Monopulse technology is used for forward-looking imaging. This technology is based on the principle of single-pulse angle measurement and is suitable for strong point targets. For complex landforms, due to the existence of multiple scattering centers, serious angular scintillation will occur; the literature "A new Sector Imaging Radar for Enhanced Vision–SIREV” (SPIE Conference on Enhanced and Synthetic Vision, 1999, pp.39-47, Florida), uses an array antenna to form an aperture to achieve forward-looking imaging, but the size of the platform limits the expansion of the antenna aperture. As a result, the improvement of azimuth resolution is limited; the document "Bistatic Forward-looking Synthetic Aperture Radar" (International Conference on Radar Systems, 2004, pp1-5) adopts the geometric configuration of bistatic SAR, which can form the equi-Doppler line and the equidistance line. Approximate orthogonal segmentation has the potential for forward-looking imaging, but due to the separation of the transceiver platform, it inevitably involves complex synchronization and motion compensation issues, making it difficult to apply in practice

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