Terahertz frequency band cylindrical spiral scanning imaging method and system

A technology of helical scanning and imaging method, which is applied in the radio wave measurement system, radio wave reflection/re-radiation, electromagnetic wave re-radiation, etc., can solve the problem of obtaining height information in the observation area, and achieve fast and stable scanning speed , Realize the effect of real-time imaging

Active Publication Date: 2020-08-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the CSAR imaging system requires that the radar must be located on the same height plane,

Method used

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  • Terahertz frequency band cylindrical spiral scanning imaging method and system
  • Terahertz frequency band cylindrical spiral scanning imaging method and system
  • Terahertz frequency band cylindrical spiral scanning imaging method and system

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[0060] In the following, the content of the present invention will be further described in conjunction with the drawings and embodiments.

[0061] Such as image 3 Shown is a schematic diagram of the cylindrical spiral track of the terahertz band cylindrical spiral scanning imaging method provided by the present invention;

[0062] A terahertz band cylindrical spiral scanning imaging method includes the following steps: the radar platform equipped with terahertz radar moves along the trajectory of the cylindrical spiral. During the movement of the radar platform, the direction of the terahertz radar line of sight always points to the center of the scene area and sends a signal , Collect the echo signal, and perform imaging based on the echo signal.

[0063] In this embodiment, a simulation experiment is used for verification, and the specific content is as follows:

[0064] The relative position of the radar platform and the imaging scene such as Figure 5 As shown, the size of the im...

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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...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S17/90G01V8/00
CPCG01S13/904G01S13/887G01S17/90G01V8/00G01V8/005G01S13/9088
Inventor 邓彬吕楚冰杨琪王宏强张野
Owner NAT UNIV OF DEFENSE TECH
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