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Three-dimensional imaging method in widefield polar format for circular synthetic aperture radar

A technology of synthetic aperture radar and polar coordinate format, which is applied in the field of 3D imaging and can solve problems such as no related reports

Inactive Publication Date: 2012-11-14
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0009] The CSAR beam always points to the same scene area, which can be considered as a special spotlight mode SAR, so the PFA algorithm should have certain portability in the field of CSAR imaging, but there is no relevant report so far

Method used

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  • Three-dimensional imaging method in widefield polar format for circular synthetic aperture radar
  • Three-dimensional imaging method in widefield polar format for circular synthetic aperture radar
  • Three-dimensional imaging method in widefield polar format for circular synthetic aperture radar

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Embodiment Construction

[0063] Various details involved in the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0064] Such as figure 2 As shown in the flow chart of the large scene polar coordinate format three-dimensional imaging method of the circular synthetic aperture radar proposed by the present invention, the input is the original echo of CSAR, and after three-dimensional imaging processing, a CSAR three-dimensional image can be obtained, and the specific implementation steps are as follows:

[0065] Step S1: Send the original radar echo signal of CSAR to the range processing unit, transform it into the range compression frequency domain along the range direction of the original echo signal, and process it through the conjugate multiplication of the ...

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Abstract

The invention discloses a three-dimensional imaging method in a widefield polar format for a circular synthetic aperture radar. The traditional polar format imaging method for a spotlight synthetic aperture radar is developed into the three-dimensional imaging method suitable for the circular synthetic aperture radar. The traditional polar format imaging method only corrects a migration term of arange cell once, and plane wave approximation of the method causes range curvature distortion, so the method only can image a narrow field. The three-dimensional imaging method in the widefield polarformat for the circular synthetic aperture radar removes a migration term of a secondary range cell through twice correction of secondary filtration of an azimuth frequency domain and the space variant filtration of an image domain based on the conventional polar format imaging method, and has more accurate three-dimensional imaging for a wider field compared with the traditional polar format imaging method.

Description

technical field [0001] The invention relates to the technical field of three-dimensional imaging, in particular to an imaging method for applying a large-scene polar coordinate format algorithm to a circular synthetic aperture radar. Background technique [0002] In recent years, circular synthetic aperture radar (CSAR) has attracted widespread attention because of its omnidirectional observation and high-resolution three-dimensional imaging capabilities. In 2004, the French aerospace laboratory (ONERA) carried out the first L-band and P-band airborne CSAR experiments in Sweden. In 2006, the laboratory carried out X-band airborne CSAR experiments in France and Germany, and obtained An omnidirectional observation image with a resolution of 0.15 m was obtained. [0003] CSAR conducts 360° omnidirectional observation of the target area through the circular synthetic aperture formed in the azimuth direction, and its beam always points to the same target area. Its unique large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 洪文林赟王彦平谭维贤吴一戎
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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