Radar imaging method of electrically large size target in ocean clutter environment

Abstract

The present invention relates to a radar imaging method for electrically large-scale targets in a marine clutter environment, specifically: the content of the present invention is to establish a surface-volume composite target scattering model in a multi-interference environment, and to use numerical and analytical hybrid algorithms for electromagnetic simulation calculations Radar imaging of electrically large-size targets in marine environments using fast back-projection imaging. In the present invention, the electrically large size means that the ratio of the physical size of the target to the wavelength is greater than 10. The working frequency band of the radar is generally in the high frequency area, for example, the frequency range of the L-band is 1-2GHz, and the frequency range of the S-band is 2-4GHz. Some military targets, including fighter jets, stealth aircraft, and aircraft carriers, are electrically large in the above-mentioned bands. In the method of the present invention, rapid and effective radar imaging of electrically large-sized targets in the marine environment can be realized through complex target geometric modeling, electromagnetic simulation calculation, fast back projection imaging algorithm and Kaiser window edge filtering.

Description

technical field [0001] The invention belongs to the field of target radar imaging, and in particular relates to a radar imaging method for an electrically large-sized target in an ocean clutter environment. Background technique [0002] Considering the vast sea area of ​​our country, the monitoring and positioning of aircraft, fishing boats, warships, and oil tankers on the ocean, and the extraction and automatic classification of target information are of great significance in national economy and national defense construction. However, due to the interference of various ground and sea clutter, it is difficult to detect targets in near-shore or far-sea environments. At present, the classic Doppler frequency domain separation target detection method is difficult to accurately distinguish whether a ship in a strong ocean clutter environment is a fishing boat, an oil tanker or a warship. [0003] For complex targets on the ground or sea in radar monitoring, the numerical meth...

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Problems solved by technology

[0007] In order to overcome the deficiencies and defects of the existing technology of combining radar raw data simulation, imaging and pattern recognition in a complex environment, the purpose of the present invention is to provide a radar imaging method for electrically large-sized targets in an ocean clutter environment. By establishing the surface-volume compound target scattering model in a multi-interference environment, and using the electromagnetic simulation calculation of the numerical and analytical hybrid algorithm and the fast back projection imaging method, the radar imaging of the electrically large-sized target in the marine environment is carried out.

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