Radar suppressing jamming and deception jamming identification method based on signal cone

Abstract

The invention discloses a radar suppressing jamming and deception jamming identification method based on a signal cone. The radar suppressing jamming and deception jamming identification method mainly aims to solve the problems that jamming characteristics extracted in the prior art are not steady, and the identification rate of jamming types is low under the condition of a low or high jamming to noise ratio. The radar suppressing jamming and deception jamming identification method comprises the steps that 1, target or jammed baseband signals are obtained; 2, jamming signal error angles mu between jamming signals and a real target echo signal are calculated; 3, a threshold angle theta is set as 80 degrees, the signal cone is obtained by using theta as a cone angle and using the real target echo signal as a center axis, the jamming signals located outside the cone are defined as suppressing jamming, and the jamming signals located inside the cone are defined as deception jamming; 4 the jamming signal error angles mu are compared with the threshold angle theta, and the types of jamming are determined. Jamming characteristics extracted in the radar suppressing jamming and deception jamming identification method are steady, the types of the suppressing jamming and the deception jamming are effectively identified by using the conception of the signal cone under the condition of the high or low jamming to noise ratio, and the radar suppressing jamming and deception jamming identification method can be used for anti-jamming, target detection and target tracking of radar.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a method for identifying radar suppressive interference and deceptive interference, which is used for specific identification of interference types and selection of anti-interference measures. Background technique [0002] Suppressive jamming is to use the noise jamming signal emitted by the jammer to cover or submerge the normal echo signal, preventing the radar from detecting target information. Suppressive interference is mainly achieved by emitting high-power noise, which can interfere with any type of radar signal, because the best interference waveform is the waveform with the strongest randomness or the greatest uncertainty, and Gaussian white noise has the best interference interference waveform. Therefore, the suppressive jamming that uses Gaussian white noise to modulate the radar transmission frequency is a jamming style often used in radar countermeasures. According ...

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Problems solved by technology

[0004] When the radar detects interference, the existing methods identify the two types of interference by extracting the characteristics of time domain, frequency domain, and change domain of deceptive interference and suppression interference. See Fan Wei's May 2007 master thesis "Radar Active Interference Signal Feature Analysis and Recognition Algorithm Research" and Li Zhiming's April 2009 master's thesis "Research on Automatic Identification Method for Radar Active Interference Signals", but these methods have relatively high complexity in extracting interference features, and only in a certain dry noise The two types of interference can be correctly identified with a high probability only by comparison. When the interference-to-noise ratio is low or high, the difference between the two types of interference features is not obvious, and the recognition rate is low.

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