Terahertz aperture coding phase-free imaging device and method based on array incoherent detector

Abstract

The invention provides a terahertz aperture coding phase-free imaging device and method based on an array incoherent detector. The invention aims to replace a plurality of coherent detectors in a traditional terahertz aperture coding imaging radar by using the array incoherent detector, only the intensity information of an echo signal is received in the receiving process, the phase information isnot received, so that a system receiving link is simplified, the system complexity is reduced, the manufacturing cost is reduced, and meanwhile, the integration and miniaturization are easy; and the array incoherent detector adopts a multi-channel output technology to complete high-speed acquisition of echo data, so that the coding and sampling times can be effectively reduced, and high-speed imaging or real-time imaging of terahertz aperture coding is realized.

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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