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Rapid backward projection imaging method of terahertz circular track SAR

A technology of back projection and imaging method, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., which can solve the problems of large amount of calculation in the back projection algorithm, and reduce the complexity and calculation amount , the effect of improving computing efficiency

Inactive Publication Date: 2019-12-17
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

This method aims to solve the problem of the large amount of calculation of the back projection algorithm in the imaging process of the circular trace SAR in the terahertz band, realize the reduction of the calculation amount, effectively improve the calculation efficiency, and has practical application prospects

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  • Rapid backward projection imaging method of terahertz circular track SAR
  • Rapid backward projection imaging method of terahertz circular track SAR
  • Rapid backward projection imaging method of terahertz circular track SAR

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Embodiment Construction

[0057] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the protection scope of the present invention.

[0058] The present invention is a fast backward projection imaging method of terahertz circular track SAR, such as figure 1 As shown, the method includes the following steps:

[0059] Step 1: If figure 2 As shown, the imaging model of terahertz circular track SAR1 is established, and the projection point of the center of terahertz circular track SAR 1 on the ground is taken as the center point 2. Since the range direction and azimuth direction of terahertz circular track SAR 1 can achieve the same resolution, in Select a rectangular area in the observation area to establish an imaging grid 3 equidistant in the azimuth direction and distance direction of the terahertz circular track SAR 1; the gr...

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Abstract

The invention discloses a rapid backward projection imaging method of terahertz circular track SAR. The method comprises the following steps: 1, establishing imaging grids of equidistant imaging points in the azimuth direction and the distance direction of the terahertz circular SAR, and performing matched filtering in each azimuth direction on a linear frequency modulation signal to complete compression in the distance direction and obtain a distance compression signal; 2, in a certain azimuth direction, projecting the imaging points through the distance compression signal to obtain a backscattering coefficient of the imaging points in the azimuth direction; 3, repeating the step 2 in each azimuth of the terahertz circular track SAR to obtain a backscattering coefficient of an imaging point in each azimuth; and 4, coherently superposing the backscattering coefficients of the imaging points in all azimuth directions to obtain an imaging result of terahertz circular SAR projection. Themethod solves the problem of large calculation amount of a back projection algorithm in a circular SAR imaging in the terahertz waveband, realizes reduction of the calculation amount, effectively improves the calculation efficiency, and has a practical application prospect.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a terahertz circular track SAR fast backprojection imaging method. Background technique [0002] In Synthetic Aperture Radar (SAR) imaging, obtaining radar imaging with high azimuth resolution is an important direction of its development. Traditional linear SAR can only acquire target features at a certain angle, and the Doppler bandwidth is limited; spotlight SAR increases the Doppler bandwidth and improves the azimuth resolution by increasing the wide surveying angle. Circular Synthetic Aperture Radar (CSAR) takes the center of the target scene as the center, and the antenna beam always points to the target scene. All-round observation can obtain the full-view characteristics of the target, which greatly improves the azimuth resolution and can also obtain the target Omni-directional target scattering characteristics. Terahertz circular SAR combines terahertz w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9094G01S13/9017G01S13/9088
Inventor 阚学超盛佳恋王海涛卢护林苏皎阳
Owner SHANGHAI RADIO EQUIP RES INST