Self-correcting method for spherical surface phased-array antenna near-field channel calibration link

Abstract

The invention provides a self-correcting method for a spherical surface phased-array antenna near-field channel calibration link. The self-correcting method can consume few hardware resources and automatically operate the calibration link. According to the technical scheme, the method comprises the steps that before amplitude / phase characteristic calibration is performed on all channels of an array antenna, according to the spherical surface array antenna top calibration antenna concentrated characteristics, a fixed antenna element is selected for performing calibration, the relative amplitudeand phase characteristics of the antenna top calibration link are calibrated, antenna top calibration antennas are made to correspond to calibration rods distributed in the periphery respectively, the same antenna channel on the spherical surface array antenna is adopted, and the amplitude / phase difference between the two adjacent calibration antenna channels is calibrated; then, the differentialtransmission self-correcting mode is adopted from the top of the antenna to different directions, and the relative amplitude / phase characteristics of the two calibration links are obtained; an antenna element channel fixed to the spherical surface array antenna is used for performing amplitude / phase correction reversely, and the relative amplitude / phase characteristics of each calibration link are obtained.

Description

technical field [0001] The invention relates to a self-calibration method for a channel calibration link of a measurement and control system in the field of aerospace measurement and control, in particular to a self-calibration method for a near-field channel calibration link of a digital multi-beam spherical phased array antenna. Background technique [0002] The phased array antenna is developed from the array antenna, which mainly relies on the phase change to realize the movement or scanning of the antenna beam pointing in space, also known as the electronically scanned array (ESA) antenna. It is an antenna array composed of many unit channels. It is a multi-channel system that contains a large number of antenna units. Each channel contains several microwave devices, such as radiation antenna units, phase shifters, electric attenuators, power amplifiers, and frequency converters. , LNA, filter, limiter, etc. It is difficult for these microwave devices to ensure that the...

AI Technical Summary

Problems solved by technology

The above-mentioned manual calibration method involves the disassembly and assembly of the calibration link in each operation, and cannot perform self-calibration on the calibration link while maintaining the equipment status. The error code can be calibrated in real time and automatically, and A separate test platform needs to be built for each calibration, which is very inconvenient in operation and use

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