Terahertz aperture coding three-dimensional target scanning imaging method

Abstract

Currently, the two-dimensional imaging technology under the aperture coding imaging system is no longer suitable for a three-dimensional target. To solve the above defect in the prior art, the invention provides a terahertz aperture coding three-dimensional target scanning imaging method. In the invention, an entire three-dimensional imaging area where a three-dimensional target is located is evenly divided into three-dimensional imaging units with the same size and, for each three-dimensional imaging unit, an updated lens phase modulation factor is calculated according to the position of thesingle three-dimensional imaging unit, such that complete coverage of the three-dimensional imaging units can be realized and complete scanning of the three-dimensional imaging area is achieved. The method of the invention can achieve forward-looking high-resolution imaging for a close-distance three-dimensional target, effectively increases the imaging range and speed of terahertz aperture codingimaging, improves the imaging efficiency, reduces the requirements for computer memory configuration, and is applicable to the security inspection and counter-terrorism, target detection and identification and other near-field imaging fields.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional target block scanning, in particular to a three-dimensional target block scanning method based on terahertz aperture coding imaging. Background technique [0002] With the development of society, radar high-resolution imaging plays an increasingly important role in ensuring national strategic security and promoting national economic development. Optical radar can perform forward-looking imaging with short wavelength, high resolution and fast imaging speed, but it relies on target radiation, has poor penetration ability to smoke, dust, fog and obstacles, and is easily affected by environmental factors. Microwave radar can actively detect and has strong penetrating ability. However, due to the low microwave frequency, long wavelength, and low angular resolution, and due to the limitation of the imaging principle, imaging accumulation time is required, and high frame rate and high resolutio...

AI Technical Summary

Problems solved by technology

However, this method is aimed at low-resolution imaging in the microwave segment, the grid division is relatively sparse, and the scale of the reference signal matrix is ​​relatively small

For high-resolution imaging of relatively large-volume 3D targets, such as the human body in security inspection imaging, the scale of the reference signal matrix that needs to be constructed is doubled. On the one hand, the radiation field reference matrix for the entire human target is huge, and the imaging process requires too much computer memory

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