Amplitude and phase consistency calibration method of multiple channels of human body security inspection system

Abstract

The invention discloses an amplitude and phase consistency calibration method of multiple channels of a human body security inspection system. The method comprises the following steps that: long-distance calibration and first-time short-range calibration are combined to obtain measuring data of all channels as well as comparison coefficients of all the channels are established; before each case scanning is carried out, short-range calibration at this time is carried out to obtain measuring data of this time of all the channels as well as the comparison coefficients are utilized to correct the measuring data of this time to obtain calibration data of this time; and the calibration data of this time are utilized to carry out normalized calibration on amplitudes and phases of all the channels. According to the invention, the short-range calibration technology and the long-distance calibration technology are combined, so that a problem caused by frequent usage of a long-distance calibrator can be solved; short-range real-time calibration is carried out, so that working stability of the system can be ensured for a long time and thus working efficiency of a human body security inspection system based on millimeter wave active high speed cylindrical rotation three dimensional holographic imaging can be effectively improved.

Description

technical field [0001] The invention relates to a multi-channel amplitude and phase consistency calibration method for a human body security inspection system. More specifically, the present invention relates to a method for multi-channel amplitude and phase consistency calibration of a human body security inspection system based on millimeter-wave active high-speed cylindrical rotation scanning three-dimensional holographic imaging. Background technique [0002] The millimeter-wave active high-speed columnar rotating scanning 3D imaging human body security inspection system adopts the millimeter-wave active columnar synthetic aperture technology to realize the non-undressed security inspection of the personnel to be inspected. In order to meet the requirements of cost control, the collection of columnar three-dimensional data usually adopts the mechanical rotation scanning in the circumferential direction, and the rapid electrical switching technology in the vertical direct...

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Problems solved by technology

[0003] In the past, when calibrating the channel amplitude and phase consistency of this type of security inspection system, the usual method is to place a calibration object in the remote area of ​​the target center of the security inspection system. The advantage of this method is that it can ensure that the one-dimensional array of switches and antennas is The consistency calibration of the amplitude and phase of each channel in the remote area has high accuracy. The disadvantage is that each calibration needs to install a calibration body in the center of the area to be measured. Due to the requirements of the security system’s work efficiency, it cannot be realized For the real-time calibration of the system, in order to solve the above problems, it is necessary to combine the structure and working principle of this type of millimeter-wave security inspection system to explore a new calibration method that can ensure the accuracy and real-time performance of the amplitude and phase consistency calibration of each channel of the security inspection system switch and antenna array.

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