Terahertz aperture-encoded phase-free imaging device and method based on array incoherent detectors

Abstract

The invention provides a terahertz aperture coded phase-free imaging device and method based on an array incoherent detector. The present invention aims to replace multiple coherent detectors in traditional terahertz aperture-coded imaging radars with an array of non-coherent detectors, and only receive the intensity information of the echo signal but not the phase information during the receiving process, thereby simplifying the system receiving chain way, reduce system complexity, reduce manufacturing costs, and make it easy to integrate and miniaturize. Array non-coherent detectors use multi-channel output technology to complete high-speed acquisition of echo data, which can effectively reduce the number of encoding and sampling, and realize Terahertz aperture-encoded high-speed or real-time imaging.

Description

technical field [0001] The invention relates to the technical field of high-resolution staring imaging in the terahertz frequency band, in particular to a terahertz aperture-encoded phase-free imaging device and method based on an array incoherent detector. Background technique [0002] With the advancement of technology and the increase of market demand, terahertz high-resolution staring imaging radar is getting more and more attention, and it will play an important role in national defense construction and social development. Traditional terahertz high-resolution imaging radars mainly include real aperture array radar, synthetic aperture radar (SAR), inverse synthetic aperture radar (ISAR) and phased array radar. Among them, synthetic aperture radar and inverse synthetic aperture radar both rely on the relative motion between the radar and the target, and achieve high-resolution imaging in azimuth and elevation through synthetic virtual aperture, but cannot achieve forward...

AI Technical Summary

Problems solved by technology

However, the link of coherent reception is complex, and coherent receivers usually include low-noise amplifiers, intermediate frequency oscillators, mixers and other devices, which need to down-convert and reduce the bandwidth of the echo signal

In addition, the current coherent receiving devices still have certain difficulties in receiving high-frequency and large-bandwidth signals, especially in the terahertz high-frequency band, it is difficult to achieve accurate phase measurement

When it is necessary to use multi-channel output technology to achieve high-speed imaging or real-time imaging, a large number of coherent receivers will be used. At present, the cost of a single coherent receiver is relatively high. If it is used in large quantities, it will inevitably lead to an increase in system complexity and manufacturing costs. Difficult to be practical

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