A thz-qomimo architecture suitable for terahertz security detectors

Abstract

The invention discloses a THz-QoMIMO framework suitable for a Terahertz security check instrument, comprising signal processing and target recognition digital hardware, Terahertz MIMO array front end high frequency hardware, and one-dimensional quasi-optics focusing and scanning, and employing an MIMO array layout. By utilizing MIMO synthetic focusing, a system frame rate is increased, and sending and receiving channels are reduced so as to reduce system costs; in addition, the THz-QoMIMO framework can simplify a system whole machine structure, improve system work reliability, perform repeated multi-angle measurement, reduce coherent speckle influence, and facilitate automatic target detection and recognition; besides, the THz-QoMIMO framework employs an image classification recognition method with distance information z as the primary and intensity information I as the complement, and is especially suitable for an active Terahertz rapid security check instrument.

Description

Technical field [0001] The invention relates to a terahertz radar three-dimensional imaging technology, in particular to a THz-QoMIMO architecture suitable for a terahertz security checker. Background technique [0002] Active terahertz fast security inspection instrument is an important application field of terahertz wave. The general application requirements of the active terahertz fast security inspection instrument: 1. Larger bandwidth to meet higher longitudinal resolution requirements and improve target detection capabilities; 2. Faster speed to meet real-time monitoring requirements under normal traffic; 3 .Tahertz arrays should be chipped and solid-state as much as possible to facilitate integration and miniaturization, improve reliability and consistency, and reduce batch costs; 4. Automatic target detection and recognition to meet the protection requirements for personal privacy. These requirements put many constraints on the optical structure, terahertz array front en...

AI Technical Summary

Problems solved by technology

But at present, because the cost of the terahertz local oscillator frequency multiplication chain is relatively high, the main consideration is to increase the mechanical scanning speed to appropriately increase the system frame rate

The mechanical scanning speed is limited, which limits the improvement of the system frame rate

[0007] 2. The quasi-optical structure is complex, which makes the system structure complex and large, and the system reliability decreases:

[0008] The quasi-optical focusing and scanning structure of this solution requires two-dimensional focusing (focus point) and fast scanning, so the quasi-optical structure is generally more complicated; thus making the whole system complex and large, affecting the usability of the system

Due to the need for fast two-dimensional mechanical scanning, large vibrations will be generated, which will affect the stability of the optical path, etc., thereby reducing the reliability of the system.

[0009] 3. Strong coherence speckle (Speckle) is not conducive to automatic target detection and recognition:

Therefore, for the same target, the intensity of the received backscatter signal (Back-Scatter) changes greatly, that is, the coherent speckle is strong; thus, it is not conducive to automatic target detection and recognition

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