Short-range microwave holographic imaging experiment system and method

Abstract

The invention discloses a short-range microwave holographic imaging experiment system and method. An experiment platform is set up through a reconstruction target, a scanning device, a scanning control device, an image processing device and a vector network analyzer to study the short-range microwave holographic imaging technology. The scanning device can complete scanning of the reconstruction target just through two horn antennae, so that the cost is greatly lowered, and experiment errors are reduced. The vector network analyzer is adopted for achieving the cross-correlation phase solution of signals to obtain S parameter data of the target, so that the real-time performance is good, the efficiency is high, and the deign cost and the complexity are greatly lowered. The image processing device processes holographic data of the target according to the convolution kernel grid method, so that the aliasing effect caused by grid deviation is effectively eliminated, and the definition and the imaging quality of a target reconstructed image are improved. By means of the short-range microwave holographic imaging experiment system and method, problems probably existing in the practical application of the short-range microwave holographic imaging technology can be better found out and solved, and therefore the development of the short-range microwave holographic imaging technology in the practical application can be promoted.

Description

technical field [0001] The invention relates to the field of microwave holographic imaging, in particular to a short-range microwave holographic imaging experimental system and an experimental method. Background technique [0002] Microwave imaging technology can detect targets under opaque objects such as biological tissues, ceramics, and plastics, and has been widely used in biomedical imaging, concealed weapon detection, through-wall imaging, nondestructive testing, and human security inspection. In microwave imaging technology, microwave holography is a fast inversion technology. It mainly relies on measuring the amplitude and phase of the scattered wave of the target to obtain the target hologram, and then obtains the microwave image of the target through inversion. The short-range target in microwave holography Imaging has been considered for applications such as biomedical imaging, tomographic imaging, and human security inspection. [0003] The earliest research on ...

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Problems solved by technology

Some domestic institutions have also done research on the imaging algorithm and imaging system of this technology, but it is still in its infancy, and the imaging algorithm and prototype have yet to be perfected

[0004] In addition, the short-range millimeter-wave holographic imaging technology itself has many shortcomings: first, this imaging technology mainly uses antenna array scanning, which is costly; second, the imaging system device uses an antenna array located on the side of the target, and only collects data, the imaging resolution is limited; moreover, the imaging algorithm assumes that the incident field of the target and the Green's function are approximated by spherical waves to calculate and finally derive the imaging formula. For short-range imaging, this assumption is unreasonable. The incident field and Green's function of should be numerical functions

However, most of the experimental work of short-range millimeter-wave holographic imaging technology is realized based on general-purpose electromagnetic simulation software, and only a small part of the experimental platform is built for research and needs to be improved, resulting in many problems that may exist in practical applications. It is extremely unfavorable for the development of practical imaging systems in the future

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