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Near-field real-time calibration method for human body millimeter wave imaging safety inspection system

A millimeter-wave imaging and calibration method technology, which is applied to radio wave measurement systems and instruments, can solve problems such as poor calibration repeatability, difficult multi-channel calibration, and difficult real-time calibration, achieving less calibration time, less radiation field disturbance, and guaranteed Effect of Calibration Accuracy

Inactive Publication Date: 2013-03-06
中国航天科工集团第二研究院二〇三所
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Problems solved by technology

[0008] The purpose of the present invention is to provide a near-field real-time calibration method for human body millimeter-wave imaging security inspection system, which solves the problems of difficulty in multi-channel calibration, real-time calibration, and poor calibration repeatability in previous methods

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  • Near-field real-time calibration method for human body millimeter wave imaging safety inspection system

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Embodiment Construction

[0036] The specific steps of a near-field real-time calibration method for a human body millimeter-wave imaging security inspection system are:

[0037] The first step is to set up the calibration system

[0038] The calibration system includes: switch array, antenna array, metal calibration line, amplitude-phase consistency calibration module, and relative delay calibration module.

[0039] The switch array is connected to the antenna array feeder. The metal calibration line is placed in the area directly in front of the initial position of the antenna array, the installation angle of the metal calibration line is perpendicular to the ground, and the distance between the metal line and the antenna array is 10 cm.

[0040] The function of the amplitude-phase consistency calibration module is to calibrate the amplitude and phase consistency of the switch array and the antenna array.

[0041] The function of the relative time delay calibration module is to calibrate the relati...

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Abstract

The invention discloses a near-field real-time calibration method for a human body millimeter wave imaging safety inspection system, and the calibration system comprises a switch array, an antenna array, a metal calibration line, an amplitude and phase consistency calibration module and a relative time delay calibration module. The antenna array is used for measuring a reference signal, the amplitude and phase consistency calibration module is used for calibrating amplitude and phase consistency, and the relative time delay calibration module is used for calibrating relative time delay, thereby completing the near-field real-time calibration method for the human body millimeter wave imaging safety inspection system. In the method, the metal line is adopted for performing near-field calibration on the imaging system, and the disturbance of the structure of the metal calibration line on a radiation field of the antenna array is small, so that the calibration repeatability is good, and the calibration precision can be ensured. The calibration method can complete calibration by only performing measurement on an air target region once, a calibration reflector does not need to be placed, the calibration time is less than imaging measurement time, and real-time calibration can be performed on a working clearance of the system at any time.

Description

technical field [0001] The invention relates to a near-field real-time calibration method, in particular to a near-field real-time calibration method for a human body millimeter wave imaging security inspection system. Background technique [0002] The existing active millimeter wave human body imaging security inspection system, referred to as the imaging system, consists of an image acquisition and processing device, a mechanical scanning and electrical scanning hybrid scanning device, a millimeter wave transmitter receiver, a linear antenna array and a switch array. The imaging system uses millimeter waves to irradiate the human body for imaging. The imaging system transmits a broadband step-frequency modulation signal for measurement, and performs two-dimensional scanning in the horizontal and vertical directions to obtain target three-dimensional measurement information. The imaging system adopts a mixed scanning method of mechanical scanning and electronic scanning, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40
Inventor 柏兵年丰方维海
Owner 中国航天科工集团第二研究院二〇三所
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