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Azimuth de-slanting method of sar sliding spotlight mode

A technology of azimuthal declination and sliding beamforming, applied in instruments, measurement devices, and re-radiation, etc., can solve problems such as the failure of virtual rotation point models, achieve removal of Doppler aliasing, and flexibility and simplicity in system design and implementation Effect

Active Publication Date: 2022-04-15
AEROSPACE INFORMATION RES INST CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an azimuth deflection method for SAR sliding beamforming mode to solve the problem of failure of the virtual rotation point model in sliding beamforming mode with large azimuth scanning angle

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  • Azimuth de-slanting method of sar sliding spotlight mode
  • Azimuth de-slanting method of sar sliding spotlight mode
  • Azimuth de-slanting method of sar sliding spotlight mode

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Embodiment Construction

[0018] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention.

[0020] refer to figure 1 Shown is a schematic diagram of the sliding beamformin...

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Abstract

A method for azimuth de-tilting of SAR sliding spotlight mode. The method includes: determining the Doppler frequency corresponding to each azimuth moment according to the six orbit numbers, the satellite attitude angle and the antenna scanning angle of each SAR azimuth moment within the imaging time; according to the Doppler frequency corresponding to each azimuth moment, Determine the Doppler history within the imaging time; determine the relative distance history within the imaging time according to the Doppler history; determine the azimuth deramping function according to the relative distance history; multiply the echo signal with the azimuth deramping function to The echo signal is de-slanted in azimuth. The azimuth de-slanting method provided by the present invention does not depend on the virtual rotation point, can solve the problem of failure of the virtual rotation point model in the large azimuth scanning angle sliding beamforming mode, and can accurately remove Doppler aliasing caused by beam azimuth scanning.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar (SAR) data processing, in particular to an azimuth de-slanting method for SAR sliding spotlight mode. Background technique [0002] The sliding beamforming mode is the most commonly used imaging mode for high-resolution wide-range SAR in advanced systems. In the sliding beamforming mode, the intersection point of the antenna beam centers is at a certain point below the ground plane, which is called a virtual rotation point. The first step of the existing frequency domain imaging algorithm is usually to perform azimuth deskewing on the echo signal. The azimuth deskewing method usually calculates the distance history from the virtual rotation point to the satellite, and then uses the distance history to realize the azimuth deskewing . It can be seen that existing azimuth deskewing methods rely on virtual rotation points. [0003] However, with the improvement of SAR azimuth width ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9052
Inventor 黄丽佳孟大地李莹莹胡玉新仇晓兰韩冰仲利华尹迪
Owner AEROSPACE INFORMATION RES INST CAS