Equidistant distribution sub-array system and anti-accompanying interference method

Abstract

The invention, which belongs to the technical field of radar signal and information processing, discloses a method for resisting accompanying interference of an equidistant distribution subarray, comprising the following steps: firstly, suppressing side lobe interference and retaining main lobe interference and target signals by applying a side lobe interference zero setting technology containing MLM constraint on the subarray; secondly, based on the sparsity of a main lobe target and an interference signal among the sub-arrays, detecting the target and the interference signal in the main lobe by using an optimization method, and realizing the separation of the target and the interference signal; and finally, target angle estimation is realized by comprehensively applying an FA technology and an angle coordinate ambiguity resolution algorithm based on coordinate clustering. According to the method provided by the invention, theoretical derivation and simulation analysis show that the method has relatively high target and interference resolution capability, target detection capability and angle estimation precision in the main lobe interference scene.

Description

technical field [0001] The invention belongs to the technical field of radar signal and information processing, and in particular relates to an equidistantly distributed sub-array system and a method for anti-flying interference. Background technique [0002] Accompanying jamming (problem P1) is usually produced by towed or thrown active jamming equipment, and its jamming carrier is usually co-located with the fighter in the main lobe and has a certain angle difference. The main lobe interference cancellation technology (MLC) can be used to control the antenna pattern to form a notch in the main lobe interference direction, so as to achieve zero gain for this type of interference. However, in the process of air-to-ground electronic countermeasures, the fighter can effectively compress the angle difference between it and the jamming equipment by using tactics and technical means, so that it is also in the direction of the notch of the main lobe pattern, which causes the radar...

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Problems solved by technology

However, when the sub-array spacing increases (the total span reaches more than tens of meters), the system will face several technical problems that need to be dealt with: First, the traditional narrow-band radar signal no longer maintains the "narrow-band characteristic" on the large-scale array, that is, The steering vectors of each frequency point in the target echo frequency band are no longer the same, so the system needs to preprocess each received signal in the time-frequency domain to meet the limitation of the signal bandwidth of the distributed antenna; secondly, in order to ensure the external interference suppression In the process, the regularity of the grating lobe of the system is not destroyed. The system needs to design the same interference suppression filter on each sub-array to filter out the side lobe interference, and needs to ensure that the main lobe interference and the target obtain sufficient gain; finally, the grating lobe of the array pattern It will lead to ambiguity in angle measurement, and a corresponding solution needs to be given

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