Terahertz isar imaging system and image reconstruction method based on back projection

A technology of image reconstruction and back projection, applied in the field of terahertz radar imaging, can solve the problems of low imaging resolution and accuracy, and achieve the effects of high imaging result resolution, reduced downlink processing bandwidth, and high resolution

Active Publication Date: 2022-03-18
SHANXI UNIV
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Problems solved by technology

[0013] Aiming at the problem that the imaging resolution and precision are not high when the terahertz radar adopts the range-Doppler algorithm to reconstruct the target image, the present invention provides a method for high-resolution ISAR image reconstruction. The basic idea of ​​the method is Reconstruction of terahertz ISAR images is achieved by back-projecting echo signals into the imaging area and coherently accumulating them

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  • Terahertz isar imaging system and image reconstruction method based on back projection
  • Terahertz isar imaging system and image reconstruction method based on back projection

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Embodiment Construction

[0026] A terahertz inverse synthetic aperture radar imaging system includes a terahertz frequency stepping radar imaging system and a two-dimensional turntable scanning system.

[0027] The terahertz frequency stepping radar imaging system includes a frequency synthesis module, a radio frequency front end, an intermediate frequency module, a horn antenna module, a signal acquisition and processing module, a host computer control unit, and an image display unit. Among them, the control unit of the host computer is connected to the frequency synthesis module through the RS232 communication serial port, the frequency synthesis module is connected to the RF front-end through a high-frequency low-loss cable, the RF front-end is connected to the horn antenna module through a gold-plated rectangular waveguide, and the RF front-end is connected to the intermediate frequency module through The high-frequency low-loss cable is connected, the intermediate frequency module is connected to ...

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Abstract

A terahertz ISAR imaging system and an image reconstruction method based on back projection, the stepping terahertz ISAR system includes a terahertz frequency stepping inverse synthetic aperture radar imaging system, a two-dimensional high-precision electronically controlled rotary table, and a stepping motor control The stepping motor controller controls the rotation of the two-dimensional high-precision electronically controlled rotary table; the terahertz frequency stepping radar imaging system includes a frequency hopping module, a radio frequency front-end, an intermediate frequency module, a horn antenna module, and a signal acquisition and processing module; The two-dimensional high-precision electronically controlled rotary table includes an ultra-precision shaft system, a precision turbine, a worm drive, a grating dial, a liquid crystal screen and a standard computer communication interface; the stepper motor controller includes a control unit, a motor driver, a voltage regulator circuit.

Description

technical field [0001] The invention belongs to the technical field of terahertz radar imaging, and in particular relates to a terahertz frequency stepping ISAR imaging system and a two-dimensional high-resolution image reconstruction method. Background technique [0002] Terahertz refers to electromagnetic waves with a frequency of 0.1THz-10THz, corresponding to a wavelength of 3mm-30μm, which is between infrared and microwave on the electromagnetic spectrum, and is called submillimeter wave or far-infrared light. transition zone. Therefore, it has the advantages of both infrared and microwave. Compared with microwave radar, terahertz radar is easier to achieve large bandwidth and extremely narrow antenna beam, so as to obtain high-resolution images. [0003] Cooper K B, Dengler R J, Llombart N, et al. THz imaging radar for standoff personnel screening [J]. IEEE Transactions on Terahertz Science and Technology, 2011, 1(1): 169-182. [0004] Cooper, Ken B., et al."Fast hi...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S7/411G01S13/904G01S13/9064G01S13/9017
Inventor梁美彦张存林
OwnerSHANXI UNIV