Microwave millimeter wave three-dimensional holographic imaging system signal processing and imaging method

Abstract

The invention discloses a microwave millimeter wave three-dimensional holographic imaging system signal processing and imaging method. Echo signals are obtained in the microwave millimeter wave antenna array scanning process, and image focusing is carried out on a (y,k) dimension through a phase displacement migration algorithm; image focusing is carried out on the x-dimension by adopting a backward projection reconstruction method; finally, a three-dimensional complex image of an imaging target is obtained. The method integrates the characteristics of a time domain imaging algorithm and a frequency domain imaging algorithm, decoupling and imaging focusing are carried out on a vertical array dimension and a distance dimension through the phase displacement migration algorithm, the backwardprojection reconstruction algorithm is used for imaging focusing of a planar or cylindrical motion scanning dimension, and the advantages that the backward projection reconstruction algorithm is suitable for any antenna scanning rack and capable of facilitating motion compensation are used, so that the method is suitable for a microwave millimeter wave planar scanning imaging system and a microwave millimeter wave cylindrical scanning imaging system, the aim of being applicable to the two kinds of imaging systems though one-time algorithm development can be achieved, clear imaging can be achieved, and the calculation efficiency is higher.

Description

technical field [0001] The invention relates to a microwave and millimeter wave three-dimensional holographic imaging technology, in particular to a signal processing and imaging method for a microwave and millimeter wave three-dimensional holographic imaging system. Background technique [0002] Microwave and millimeter wave three-dimensional holographic imaging security inspection system is a mainstream direction of active microwave and millimeter wave human body security inspection. At present, it mainly includes plane scanning imaging system and cylindrical surface scanning imaging system. It can effectively detect contraband and dangerous goods hidden under the clothes of the human body through imaging without contacting the human body, and the electromagnetic radiation dose is only one thousandth of that of mobile phones. It is an effective new human body security inspection. Mode; can be widely used in civil aviation airports, prisons, courts, border checkpoints, cust...

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Problems solved by technology

[0003] At present, microwave and millimeter wave 3D holographic imaging signal processing methods mainly include time-domain imaging algorithms and frequency-domain imaging algorithms; time-domain imaging algorithms include time-domain correlation algorithms and back-projection reconstruction algorithms, which are applicable to any antenna scanning trajectory and can be used for Microwave and millimeter wave plane scanning and cylindrical surface scanning imaging systems have the advantage of being easy to realize motion compensation, which is a classic signal processing imaging algorithm, but due to the large amount of calculation and the consumption of hardware resources, it is difficult to meet the real-time requirements of calculation. Therefore, it is only used as an algorithm for imaging effect comparison; frequency-domain imaging algorithms include distance migration algorithm and phase displacement algorithm, and the derivation of the algorithm principles for microwave and millimeter-wave plane scanning and cylindrical surface scanning imaging systems are inconsistent. If applied to the actual system , the signal processing imaging software and hardware of the planar scanning and cylindrical scanning imaging systems need to be developed separately, which increases the hardware cost and labor cost, and prolongs the development cycle

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