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Method and system for resisting dense forwarding type defraud interference of airborne radar

A technology of spoofing jamming and airborne radar, which is applied in the field of radar, can solve the problems that cannot solve the adverse effects of constant false alarm rate detection threshold and space-time adaptive processing, and does not fundamentally filter out forwarding spoofing jamming, etc., to achieve Solve the adverse effects of radar performance, suppress deception interference, and improve the effect of detection performance

Active Publication Date: 2013-11-20
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing anti-intensive forwarding spoofing interference methods only judge whether the detected result is a real target or forwarding spoofing interference based on certain characteristics of forwarding spoofing interference, and do not fundamentally filter out forwarding spoofing. interference, unable to solve the adverse effects of forwarding spoofing interference on constant false alarm rate detection threshold and space-time adaptive processing

Method used

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  • Method and system for resisting dense forwarding type defraud interference of airborne radar
  • Method and system for resisting dense forwarding type defraud interference of airborne radar
  • Method and system for resisting dense forwarding type defraud interference of airborne radar

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Embodiment 1

[0050] The present invention is an airborne radar anti-intensive forwarding deception jamming method based on generalized sidelobe cancellation, see figure 1 , the process of resisting dense forwarding spoofing interference includes the following steps:

[0051] Step 1: Reconnaissance interference, the radar receives and channel data, space-time data through the antenna, and transmits to the digital processor of the radar, the interference reconnaissance process includes

[0052] 1.1 Convert the sum channel data to B from the pulse domain to the Doppler domain

[0053] B ~ = FB

[0054] In the formula, F is the Fourier transform matrix. This process is called pulse Doppler (Pulse Doppler, PD) processing.

[0055] 1.2 In the same way as beam processing, the space-time data X received by the radar is converted from the pulse domain to the Doppler domain

[0056] X ~ ...

Embodiment 2

[0086] The invention is also an airborne radar anti-intensive forwarding jamming system, which is designed on the basis of an airborne radar anti-intensive forwarding deceptive jamming method based on generalized side lobe cancellation. The airborne radar anti-dense forwarding deception jamming method based on generalized sidelobe cancellation is the same as that in Embodiment 1.

[0087] The airborne radar anti-dense forwarding jamming system includes a jamming reconnaissance module and a jamming filtering module, see figure 1 , the interference detection module provides dense forwarding interference direction and its interference sample information for the interference filtering module; the interference detection module is equipped with a sum channel data module, a PD processing CFAR detection module, a direction of arrival estimation module, and a comprehensive multiple wave position estimation The interference direction module, firstly, the channel data module receives the...

Embodiment 3

[0091] The airborne radar anti-intensive forwarding deception jamming method based on generalized sidelobe cancellation is the same as that in Embodiment 1, and the airborne radar anti-intensive forwarding jamming system is the same as in Embodiment 2.

[0092] The structural diagram of the present invention is as figure 1 shown. In order to clearly illustrate the specific implementation method of the present invention, the echo characteristics of the airborne radar in the present invention are first introduced in detail. Taking the airborne equidistant linear array radar as an example for analysis, the geometric relationship between the radar and the target is as follows: figure 2 shown. The carrier aircraft is flying parallel to the ground along the positive direction of the X-axis at the speed v, the angle between the radar front and the carrier aircraft speed is α, and the azimuth angle, pitch angle, cone angle and straight-line distance of the target relative to the ra...

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Abstract

The invention discloses a method and a system for resisting dense forwarding type defraud interference of an airborne radar, and the resistance of dense forwarding type defraud interference is realized through an interference scout module and an interference filter and elimination module. Interference scout is used for carrying out the PD (probability of defraud) treatment on data received by a radar; the CFAR (constant false alarm rate) detection is carried out on data in a clear area; a detection result direction of arrival is estimated; an interference direction of arrival is estimated with combination of the detection result of a plurality of wave positions. In the interference filter and elimination treatment, a sum beam pointing to the interference direction is formed according to an interference scout result; the sum beam pointing to the interference direction is used as an auxiliary passageway, an existing space passageway is used as a main passageway, the method of GSC (gain scheduling control) is adopted to filter and eliminate interference, and the channel covariance matrix of the interference is estimated according to an interference sample selected from the clear area. By adopting the method and the system, the difficult problem of inhibition on dense forwarding type defraud interference is solved, the dense forwarding type interference is fundamentally filtered and eliminated, false alarms caused by the dense forwarding type interference are reduced, adverse effects on a CRAR detection threshold and the STAP (space time adaptive processing) performance are eliminated, the detection performance of a radar target is improved, the system is simple and easy to realize, and an engineering application value is provided.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to the suppression of intensive forwarding deception interference, in particular to an airborne radar anti-intensive forwarding deception interference method and system, which is used for the suppression of forwarding deception interference of airborne phased array radar. Background technique [0002] With the development of electronic warfare technology and equipment, the electromagnetic environment faced by airborne radar is becoming increasingly complex. It is not only affected by ground (sea) clutter, but also faces the threat of spoofing interference caused by the radar signal forwarded by the opponent. The jammer based on the digital radio frequency memory can delay or frequency-shift the captured radar signal to generate a repeating jamming with the characteristics of distance deception and speed deception. Repeater jamming will cause false alarms and increase the constant false ...

Claims

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Application Information

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IPC IPC(8): G01S7/36
Inventor 王彤吴亿锋吴建新吴晓明
Owner XIDIAN UNIV
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