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

A synthetic aperture radar and inverse distance migration technology, which is applied in the direction of utilizing re-radiation, reflection/re-radiation of radio waves, measurement devices, etc. The reconnaissance requirements are concise and clear, the requirements are concise and uncomplicated, and the effect of a large oblique angle of view

Active Publication Date: 2018-04-10
NAT UNIV OF DEFENSE TECH
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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

Method used

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

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Embodiment Construction

[0050] The present invention will be further explained below in conjunction with the accompanying drawings. figure 1 The space situation map of the confrontation between the jammer and the radar is displayed on the radar two-dimensional slant range plane. The spatial geometric relationship in the figure is described by three rectangular coordinate systems, which are radar coordinate system, jammer coordinate system and deception template coordinate system. The radar coordinate system is described by the coordinate axis r-x, and its x-axis coincides with the radar track, the r-axis is perpendicular to the radar track, and the coordinate origin O rad Located closest to radar and jammer. The coordinate system of the jammer and the coordinate system of the deception template are obtained by translation of the radar coordinate system. They are respectively described by the coordinate axes p-q and u-v. Generally, the origins of their coordinates are respectively located at the posi...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/38
CPCG01S7/38G01S13/90G01S13/9011
Inventor 王伟刘永才冯德军潘小义傅其祥顾赵宇饶彬李程陆珊珊张文明
Owner NAT UNIV OF DEFENSE TECH
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