Method for inhibiting active suppressing jamming to airborne radar under clutter background

Abstract

The invention discloses a method for inhibiting active suppressing jamming to airborne radar under a clutter background. The method includes the following steps: (1) performing a Fourier transform on the nth array element echo data matrix; (2) determining a value range of Doppler frequencies of a clutter and a noise zone, and calculating a Doppler channel and echo power of the noise zone; and (3) if phased array radar is jammed, calculating a covariance matrix of the jamming, performing characteristic decomposition on the covariance matrix, determining the jamming number, and calculating an angle of each jamming; forming an assistant wave beam and a main wave beam of the kth Doppler channel, inhibiting an jamming signal of the kth Doppler channel, obtaining the data matrix of the kth Doppler channel after the jamming is inhibited, then performing space-time adaptive processing on the data matrix, and obtaining the data matrix of the kth Doppler channel after the clutter is inhibited; if the phased array radar is not jammed, performing the space-time adaptive processing on the data matrix of the kth Doppler channel, and obtaining the data matrix of the kth Doppler channel after the clutter is inhibited.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an active suppression interference suppression method for airborne radar under the background of clutter, which is used for suppressing the active suppression interference of airborne radar under the background of clutter. Background technique [0002] For airborne radar, due to the influence of many factors such as machining, each array element cannot be exactly the same, and the pattern of different array elements is difficult to keep consistent, which makes it difficult for each array element to achieve a very low sidelobe, which leads to the The sidelobe clutter of the echo received by the radar is not only numerous but also strong, and it is easy to cover the target echo signal. On the other hand, in order to reduce the probability of being detected by the airborne radar system, the target system often takes certain electronic countermeasures and emits electromagne...

AI Technical Summary

Problems solved by technology

[0002] For airborne radar, due to the influence of many factors such as machining, each array element cannot be exactly the same, and the pattern of different array elements is difficult to keep consistent, which makes it difficult for each array element to achieve a very low sidelobe, which leads to The sidelobe clutter of the echo received by the radar is not only numerous but also strong, and it is easy to cover the target echo signal

On the other hand, in order to reduce the probability of being detected by the airborne radar system, the target system often takes certain electronic countermeasures and emits electromagnetic interference signals, which also causes the target detection performance of the airborne radar system to decline, so certain measures need to be taken to Suppression of interference signals and clutter signals in airborne radar echoes

[0003] Interference signals are divided into intentional interference and unintentional interference. Among them, intentional interference is an electronic attack behavior with specific hostility against radar, which can interfere with radar in multi-dimensional domains such as airspace, time domain, frequency domain, and polarization domain. , so that the target echo characteristics are distorted or deformed, making the radar unable to accurately detect the target

Active suppression jamming is the earliest form of intentional jamming. It mainly covers the entire bandwidth of the radar system by transmitting high-power noise or noise-like signals, thereby covering the target echo signal and making the radar unable to detect the target.

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