A Phased Array Antenna Calibration Method Based on Difference Beam Calibration

Abstract

A phased array antenna calibration method based on difference beam calibration, using the phased array difference beam zero-depth characteristics to achieve high-precision alignment of the measured phased array antenna and the auxiliary antenna, using the measured amplitude value and measured phase of the received signal value, and the theoretical phase value of the received signal, obtain the secondary amplitude compensation value and secondary phase compensation value of each channel of the phased array antenna, and perform high-precision amplitude and phase calibration for each channel of the phased array antenna. The present invention utilizes the zero-depth characteristic of the differential beam to perform high-precision calibration of the phased array antenna in the mid-field test method. The method can realize the high-precision alignment of the auxiliary antenna and the tested antenna, and there is no fitting error, and can obtain high-precision Calibration result. In addition, the method does not need to meet the far-field conditions and can be carried out in a dark room all day, without auxiliary test equipment such as a total station, and has strong operability and high engineering value.

Description

technical field [0001] The invention relates to the field of aerospace, in particular to a mid-field test method for high-precision calibration of phased array antennas by utilizing difference beam zero-depth characteristics, which can be applied to the field of phased array antenna unit amplitude and phase calibration. Background technique [0002] In the process of phased array radar antenna array, machining and assembly of T / R components, due to the constraints of technology level, processing capacity, and the mutual coupling of T / R components, the components of each channel after the antenna assembly is completed. There will be certain inconsistencies in power, spectrum, and amplitude and phase. The amplitude and phase distribution of the antenna array unit deviates from the design value, which leads to the decrease of the zero point depth and the ratio of the main and side lobes of the phased array radar antenna. In order to meet the design requirements, the amplitude a...

AI Technical Summary

Problems solved by technology

Patent "A Phased Array Antenna Multi-beam Automatic Calibration Device and Its Automatic Calibration Method" (Patent Application No.: CN201510051961.X, Patent Publication No.: CN104597433A) In order to realize automatic calibration, when establishing the normal beam database 3, it is necessary to Under field conditions, the normal beams in each working mode of the phased array antenna are calibrated one by one, and the calibration accuracy is limited by the alignment accuracy of the auxiliary antenna and the antenna under test

The patent "A Method for Calibrating Amplitude and Phase of a Receive Channel in a Phased Array System" (patent application number: CN201010252906.4, patent publication number: CN101938305A) provides a method for calibrating the amplitude and phase of a receiving channel in a phased array system. The amplitude and phase errors of the receiving channel are well controlled, but the calibration source of the beamforming network is required, and the scope of use is limited

Images