Method and device for correcting direction finding accuracy of ultra-wideband multi-beam system

Abstract

The invention discloses a method and a device for correcting direction finding accuracy of an ultra-wideband multi-beam system. The method comprises: testing the intermediate beam of the system usinga microwave darkroom planar test system, and recording the planar near-field test data; obtaining the amplitude phase distribution information of an antenna unit aperture field according to the inversion of the obtained planar near-field test data; determining whether the error of the amplitude phase distribution information of the antenna aperture field and the theoretical value satisfies the requirement; testing all beams and full bands of the system using the microwave darkroom planar test system; writing the direction finding table into the system according to the far field pattern of theobtained planar near-field data inversion system; and inputting the calculated code value to obtain the correction parameters for each channel after the beam correction compensation is completed. Themethod and device have simple and convenient engineering implementation, can improve the direction finding accuracy of the system, especially in the case that the target frequency deviates from the center frequency and the target bearing deviates from the intermediate beam, which is beneficial to the subsequent target tracking processing.

Description

technical field [0001] The invention relates to a broadband active phased array system, in particular to a method and device for correcting direction finding accuracy of an ultra-wideband multi-beam system. Background technique [0002] In order to adapt to the detection and reception requirements of various electronic signals under complex electromagnetic environment conditions, the requirements of high gain, large instantaneous bandwidth, wide airspace coverage, large dynamic range, and high direction-finding accuracy are put forward for the antenna system. The Rotman lens is a low-profile, light-weight, and small-volume true-time-delay network that can realize broadband signal beamforming under wide-sweep angle conditions. The multi-beam antenna system based on Rotman lens has the characteristics of high omnidirectional intercept probability, large dynamic range, high sensitivity, and multi-target tracking. Due to the inconsistency of the material, processing and assembl...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the direction finding accuracy of the existing system is easy to deteriorate, especially when the target frequency deviates from the center frequency and the target azimuth deviates from the center beam, the direction finding accuracy is more likely to deteriorate. An ultra-wideband multi-beam system is provided Calibration method and device for direction finding accuracy

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