Four-channel main lobe interference suppression angle measurement method based on feature projection preprocessing

Abstract

The invention relates to a four-channel main lobe interference suppression angle measurement method based on feature projection preprocessing. The method comprises the following steps of: firstly, filtering main lobe interference in a sampling sample only containing interference noise through feature projection matrix preprocessing, calculating a weight for suppressing side lobe interference through constrained adaptive beam forming, forming a new sum channel, a new pitch difference channel, a new azimuth difference channel and a new double-difference channel, suppressing main lobe interference through a four-channel main lobe suppression monopulse angle measurement technology, detecting a target, and measuring a target angle. According to the method, after main lobe interference is suppressed, angle measurement of the target can be realized, the target can be detected under the conditions of main lobe interference and side lobe interference, and accurate angle measurement can be performed on the target, so that the defect that the traditional four-channel main lobe interference suppression monopulse angle measurement technology can only suppress one main lobe interference theoretically is overcome.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a four-channel main lobe interference suppression angle measurement method based on characteristic projection preprocessing. Background technique [0002] With the rapid development of electronic technology, the electromagnetic environment faced by modern radar systems is becoming more and more complex. Various forms of active and passive interference, as well as ground (sea) clutter, etc. bring extreme challenges to radar target detection, positioning and tracking. big difficulty. Among them, active interference enters the radar receiver and signal processing system through the main lobe or side lobe of the receiving antenna, seriously affecting the detection performance of the radar system. Therefore, radar anti-jamming has developed into a very popular and important technology in the current radar engineering and academic fields. [0003] Adaptive...

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Problems solved by technology

[0004]However, in the blind source separation method, there is no mature solution for the angle measurement of the separated target signal; the characteristic projection matrix preprocessing algorithm suppresses the main lobe interference, It is also difficult to apply to the angle measurement of the target; although, using the synthetic sum beam, azimuth difference beam, elevation difference beam and double difference beam can perform adaptive processing to eliminate the main lobe interference, and complete the single pulse measurement in the azimuth or elevation dimension respectively. angle, but since the system has only two degrees of freedom in any dimension, it can only eliminate one main lobe interference. Therefore, when there is main-lobe suppression interference in the environment, the four-channel main-lobe interference suppression single-pulse angle measurement technology is not effective. then apply

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