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

Abstract

The invention relates to a radar imaging method of an electrically large size target in the ocean clutter environment. The radar imaging method is that the radar imaging of the electrically large size target in the ocean clutter environment is achieved by establishing a surface-box complex target scattering model in a multi-interference environment and adopting electromagnetic simulating calculation through a numerical and analytical hybrid algorithm and a rapid back projection imaging mode. The electrically large size in the radar imaging method means that the ratio of the physical dimension to the wavelength of the target is larger than ten. The working frequency range of a radar is generally in a high frequency area, for example, the L waveband frequency ranges from 1GHz to 2 GHz, and the S waveband frequency ranges from 2GHz to 4 GHz. Some military targets, such as fighters, invisible planes and aircraft carriers in the L waveband and the S waveband belong to the electrically large size. According to the radar imaging method, the radar imaging of the electrically large size target in the ocean clutter environment can be achieved by means of geometric modeling of complex targets, the electromagnetic simulating calculation, the rapid 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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