Terahertz frequency band cylindrical spiral scanning imaging method and system

Abstract

The invention belongs to the technical field of radar signal processing and synthetic aperture radar imaging, and particularly relates to a terahertz frequency band cylindrical spiral scanning imagingmethod and system. The method comprises the steps that a radar platform carrying a terahertz radar moves along the track of a cylindrical spiral line, in the moving process of the radar platform, thesight direction of the terahertz radar points to the center of a scene area all the time, signals are sent, and echo signals are collected for imaging. The system executes the steps of the terahertzfrequency band cylindrical spiral scanning imaging method. According to the method, a cylindrical spiral scanning mode is adopted, the acceleration and deceleration process of an existing linear scanning mode is avoided, and real-time imaging can be achieved. Due to the stability and the central symmetry of cylinder rotation scanning, imaging processing can be started from any moment of the rotation process and is not limited to the same starting point and the same terminal point. According to the imaging system, the number of array elements can be effectively reduced on the premise of ensuring high imaging resolution, and the system cost is reduced.

Description

technical field [0001] The invention relates to millimeter wave / terahertz security inspection imaging technology, belongs to the field of radar signal processing technology and synthetic aperture radar (SAR) imaging technology, and particularly refers to a cylindrical spiral scanning imaging method and system in the terahertz frequency band. Background technique [0002] The use of radar to achieve high-resolution imaging of targets is a widely used method, which has the characteristics of all-day, all-weather, high-resolution, etc., and has very important applications in remote sensing measurement, military reconnaissance and security inspection. Terahertz (Terahertz, THz) frequency band usually refers to electromagnetic waves with a frequency between 0.1THz and 10THz (corresponding to a wavelength of 30μm-3mm). The broad application prospects in many fields have attracted widespread attention, and it is one of the internationally recognized important frontier science and t...

AI Technical Summary

Problems solved by technology

However, the CSAR imaging system requires that the radar must be located on the same height plane, and the height information of the observation area cannot be obtained through a single flight path

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