Terahertz multi-mode real-time imaging system

Abstract

The invention discloses a terahertz multi-mode real-time imaging system which comprises a terahertz quasi-optical feed-in module, a terahertz planar imaging array frontend module, an intermediate-frequency readout circuit, a signal processing and control module, a display module, a baseband signal generating module, a terahertz transmitting signal and a local oscillator signal module. The system can operate in four working modes of passive non-coherent, passive coherent, active non-coherent and active coherent, and can satisfy application requirements such as all-weather mute supervision, suspected key target imaging and tracking. Furthermore the system can improve image contrast on the condition of imaging quality reduction caused by environment factors. The system is suitable for aerospace situation perception and aerospace target imaging tracking.

Description

technical field [0001] The invention belongs to the technical field of terahertz imaging, in particular to a terahertz real-time imaging system. Background technique [0002] Terahertz (THz) waves usually refer to electromagnetic radiation (1THz=10 12 Hz), between microwaves and infrared radiation on the electromagnetic spectrum. Terahertz waves have very important application value in space situational awareness and space target monitoring and tracking. [0003] From the perspective of propagation characteristics, the propagation attenuation of terahertz waves in high altitude, near space and outer space is very small, which is much lower than that in near-ground space. Therefore, terahertz waves can be used to realize long-distance target detection and tracking in the above-mentioned spaces . [0004] Secondly, from the perspective of target characteristics, the shape and shadow (contour) characteristics of targets in the terahertz frequency band are clearer than those ...

AI Technical Summary

Problems solved by technology

The first way is to use the focal plane imaging architecture to achieve real-time staring imaging, but the phase information of the target cannot be obtained

The second imaging method is to use synthetic aperture radar imaging architecture to achieve coherent detection, but it has the following disadvantages: (1) poor real-time performance; (2) it must rely on the relative moving imaging of the system and the target, and cannot keep relatively still; (3) ) is unable to look forward to imaging, and the observation angle and field of view are limited

[0009] Third, the system architecture of the existing terahertz imaging system is not flexible, and it does not have the equipment potential of standardization and pedigree

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