Single-channel SAR two-dimensional flow field inversion method and system based on Doppler center migration

A technology of Doppler center and two-dimensional flow field, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., to achieve the effect of improving utilization rate, simplifying design requirements, and wide applicability

Active Publication Date: 2019-12-10
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0007] Obtaining two-dimensional flow field information using single-channel SAR data is of great significance in practical applications, but at present, single-channel SAR can only detect one-dimensional flow field. The purpose of this invention is to propose a method based on Doppler center shift The single-channel SAR two-dimensional flow field inversion method and system of the present invention can at least partially solve the above technical problems

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  • Single-channel SAR two-dimensional flow field inversion method and system based on Doppler center migration
  • Single-channel SAR two-dimensional flow field inversion method and system based on Doppler center migration
  • Single-channel SAR two-dimensional flow field inversion method and system based on Doppler center migration

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[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0053] The traditional DCA method uses the full-aperture data irradiated on the sea surface for processing, and can only obtain Doppler information along the line-of-sight direction of the center of the beam, and then can only obtain the motion velocity component in one direction, that is, it can only detect one-dimensional flow field. The Doppler information in different directions in the irradiation beam can be obtained by sub-aperture segmentation of the data, and their joint analysis can be used to estimate the range and azimuth velocity components of the two-dimensional sea surface flow field. Therefore, the present invention discloses a single-channel SAR two-dimensional flow field inversion method and system based o...

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Abstract

The invention discloses a single-channel SAR two-dimensional flow field inversion method and system based on Doppler center migration. The method comprises the following steps: enabling a single-channel SAR to receive original data of a to-be-measured area and carry out imaging to generate a single-view complex image; segmenting the single-view complex image into N sub-aperture single-view complex images; performing spatial multi-view processing on each sub-aperture single-view complex image to obtain sub-aperture complex images; dividing each sub-aperture complex image into n sub-image blocks; and according to the Doppler center offset of each sub-image block, sequentially calculating the azimuth and distance velocity components of the two-dimensional flow field of each sub-image block region to obtain the two-dimensional flow field with the azimuth and distance velocity components in the to-be-measured region. According to the Doppler center migration-based single-channel SAR two-dimensional flow field inversion method and system provided by the invention, the influence of different motion components of the sea surface on Doppler center migration is fully considered, and the keyproblem that an existing single-channel SAR Doppler center migration method can only invert an ocean one-dimensional flow field is solved.

Description

technical field [0001] The present invention relates to the field of synthetic aperture radar (Synthetic Aperture Radar, SAR) signal processing and the application field of marine remote sensing, and more specifically relates to a single-channel SAR two-dimensional flow field inversion method and system based on Doppler center shift. Background technique [0002] Ocean current field is one of the parameters of ocean dynamics, which has a wide range of application requirements and important research significance. Currently, Synthetic Aperture Radar (SAR) is the most effective tool for flow field detection because it can obtain flow field information all-time, all-weather, in a wide range, and with high resolution. There are two main methods for SAR detection of flow field: Doppler center shift (DCA) method based on single-channel SAR data and along-track interferometry (ATI) flow measurement method based on dual-channel SAR data. [0003] The ATI method uses the interferomet...

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58G01S13/90G01S7/41
CPCG01S7/41G01S13/589G01S13/90G01S13/9004G01S13/9027
Inventor 种劲松李岩王宇航赵亚威
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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