Real-time tracking and fast imaging method applied to camera type millimeter wave human body security instrument

Abstract

The invention provides a real-time tracking and fast imaging method applied to a camera type millimeter wave human body security instrument, which solves an inversion error problem of the fast Fouriertransform algorithm of the traditional synthetic aperture in a near-field imaging application. The invention proposes a phase compensation method with beam near-field focusing to cooperate with infrared ranging information for near-field focusing and imaging of a synthetic aperture array. The method comprises the following steps: using an infrared camera to collect target distance data, using system calibration information to obtain a relationship between the phase compensation value of the near-field focusing and imaging and the target distance, and realizing the near-field focusing and imaging by performing point-by-point phase compensation of the imaging position according to the calculation result. According to the algorithm of the invention, the real-time tracking and fast imaging ofthe camera type millimeter wave human body security instrument in the near-field can be realized.

Description

technical field [0001] The invention relates to a synthetic aperture near-field inversion algorithm, specifically, a real-time tracking fast imaging method applied to a camera-type millimeter-wave human body security inspection instrument. Background technique [0002] The camera-type millimeter-wave human body security detector works in the millimeter-wave frequency band. The millimeter-wave human body security detector itself does not emit electromagnetic waves, does not cause any harm to the human body, and has the ability to work all day and all day. Therefore, passive millimeter-wave imaging technology, as an emerging security inspection method, is widely used in public places where people gather, such as airports and stations, for rapid and non-contact detection of concealed prohibited items carried by the human body. [0003] The synthetic aperture radiometer imaging technology uses a small-aperture sparse antenna array, and uses interferometry technology to complete ...

AI Technical Summary

Problems solved by technology

However, the study found that as the number of channels increases, the numerical image inversion algorithm of the system response G matrix becomes an ill-conditioned problem [5] , for which Camps proposed an extended CLEAN algorithm based on iterative operations for image inversion [6] , but the amount of calculation is huge, which cannot eliminate the morbidity of the problem in essence, nor can it meet the imaging speed requirements of the cameraman for real-time imaging of millimeter-wave human body security detectors

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