Method of using sum and difference channels of radar antenna for restraining radar side lobe interception

Abstract

The invention relates to a method of using sum and difference channels of a radar antenna for restraining radar side lobe interception. According to the method, antenna patterns of the sum channel and the difference channel of the radar main antenna are optimized, self-correcting signals of a radar system are used for obtaining amplitude and phase errors with the sum channel as the datum, and the amplitude and phase errors are used for error correction of the sum channel and the difference channel; according to the target position in the sum channel, the corresponding position, in the difference channel, of a target is searched for, and amplitude and phase correction is carried out on the complex number value of the position, where the target is located, in the difference channel by means of the amplitude and phase errors of the sum channel; the complex number modulus value of the position, where the target is located, in the sum channel is compared with the corrected complex number modulus value of the target in the difference channel to judge whether target echoes enter from main lobes or side lobes of the main antenna. Therefore, the radar system using the method can directly use the main antenna for recognizing side lobe targets without depending on an auxiliary antenna, the design difficulty of the radar antenna is effectively lowered, the number of the channels of the antenna is effectively reduced, and the reliability of the antenna is improved.

Description

technical field [0001] The invention relates to the field of radar system antenna sidelobe cancellation, in particular to a method for suppressing radar sidelobe interception by using a radar antenna and a difference channel. Background technique [0002] The modern radar system has the ability to receive and process the sum and difference channel, which is used to realize the relative angular position judgment and high-precision angle measurement function of the radar and the target airspace. However, the problem of side lobe interception will cause errors in radar angle measurement, resulting in the inability of the radar system to track the target stably, let alone give the correct angle of the target. [0003] Currently, radar designers optimize the radar main antenna pattern at the beginning of the system design. The maximum gain of the main lobe of the main antenna is more than ten decibels to several tens of decibels greater than the maximum gain of the side lobes, w...

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a method for suppressing radar sidelobe interception by using radar antenna and difference channel to solve the problem of radar system sidelobe interception under the condition of no auxiliary antenna, only using the sum and difference channel signal of the radar main antenna itself can Obtain the ability to suppress sidelobe interception, effectively reduce the difficulty of radar antenna design, reduce the number of antenna channels, and improve antenna reliability

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