A cylindrical helical scanning imaging method and system in the terahertz frequency band

Abstract

The invention belongs to the field of radar signal processing technology and synthetic aperture radar imaging technology, in particular to a cylindrical spiral scanning imaging method and system in the terahertz frequency band. The method includes the steps of: a radar platform equipped with a terahertz radar moves along the trajectory of a cylindrical helix, and during the movement of the radar platform, the line of sight of the terahertz radar always points to the center of the scene area, sends signals, and collects echo signals for imaging . The system executes the steps of the terahertz frequency band cylindrical helical scanning imaging method. The cylindrical spiral scanning mode adopted by the method of the invention avoids the acceleration and deceleration process of the existing linear scanning mode, and is beneficial to realize real-time imaging. Due to the stability and central symmetry of the cylindrical rotation scan, the imaging process can be started from any moment in the rotation process, not limited to the same starting point and the same end point. The imaging system of the invention can effectively reduce the number of array elements and reduce the system cost under the premise of ensuring high imaging resolution.

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 relates to a terahertz frequency band cylindrical spiral scanning imaging method and system. Background technique [0002] The use of radar to achieve high-resolution imaging of targets is a widely used method. It has the characteristics of all-weather, all-weather, and high-resolution. It has very important applications in remote sensing measurement, military reconnaissance and security inspection. Terahertz (THz) frequency band usually refers to electromagnetic waves with frequencies between 0.1THz and 10THz (corresponding to wavelengths of 30μm-3mm). The broad application prospects in many fields have attracted widespread attention, and it is one of the important frontier scientific and technological fields recognized international...

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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