An Inverse Range Migration Method for Large Scene Spoofing Jamming of Synthetic Aperture Radar

Abstract

Provided is an inversion range migration method for a synthetic aperture radar (SAR) large-scale scene deception jamming. The method comprises steps of: 1, constructing a jammer deception template according to a false electromagnetic characteristic which is planned to be generated by a jamming party in a radar image; 2, computing equidistant sampling values of a complementary focusing filter HHdiff (k, kx) on a two-dimension frequency domain (k, kx) plane; 3, computing equidistant sampling values of a consistent focusing filter HHbulk (k, kx) on a two-dimension frequency domain (k, kx) plane, and multiplying the equidistant sampling values of the consistent focusing filter HHbulk (k, kx) on the two-dimension frequency domain (k, kx) plane by the equidistant sampling values of the complementary focusing filter HHdiff (k, kx) on the two-dimension frequency domain (k, kx) plane acquired in the step 2; and 4, performing azimuth inverse Fourier transformation on a result acquired in the step 3 and multiplying a transformed result by the equidistant sampling values of a jammer blanking filter Hhelim (k, x) on a distance frequency domain (k, x) plane. The invention provides the SAR large-scale scene deception jamming method for overcoming defects in the prior art. The method computes jammer system frequency response accurately and high efficiently in order that a radar, when having high resolution, a large squint angle, and a long synthetic aperture, may satisfy computational complexity and focusing effects.

Description

【Technical field】 [0001] The invention belongs to the field of electronic countermeasures and signal processing, and in particular relates to countermeasure technology against synthetic aperture radar, in particular to a large-scene deception jamming method for synthetic aperture radar. 【Background technique】 [0002] SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) has all-day, all-weather, long-distance, and high-resolution imaging capabilities, which has brought unprecedented challenges to the protection of information security. Therefore, the electronic countermeasure technology of SAR has received extensive research and attention. As one of the hot and difficult issues in the field of SAR electronic countermeasures, the purpose of large scene deception jamming is to form false electromagnetic scattering characteristics in the radar image without attracting the attention of the radar operator, thereby confusing the radar target recognition process and destroying t...

AI Technical Summary

Problems solved by technology

However, in exchange for the optimization of the calculation amount, the existing methods sacrifice the focusing effect of the interference signal to varying degrees

At present, when the radar has high resolution, obvious oblique viewing angle, or large synthetic aperture, the false targets in the large scene generated by the existing method will not be able to focus well

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