SAR imaging method based on spatial domain support area fusion

An imaging method and technology of support area, applied in the field of SAR imaging, can solve the problems of reducing the real-time performance of the algorithm, difficult imaging algorithm, coherent fusion high-resolution imaging, etc., to solve the azimuth focus position aliasing, the azimuth position consistency, and eliminate the dislocation phenomenon. Effect

Active Publication Date: 2017-06-30
XIDIAN UNIV
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Problems solved by technology

[0005] However, due to its special interpolation method, the traditional Omega-K algorithm makes azimuth focusing and decoupling complete at the same time; on the one hand, the traditional Omega-K algorithm makes it difficult to combine imaging algorithms with existing motion compensation methods; on the other hand, Azimuth coherent fusion between sub-apertures will not be possible to achiev

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  • SAR imaging method based on spatial domain support area fusion
  • SAR imaging method based on spatial domain support area fusion
  • SAR imaging method based on spatial domain support area fusion

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[0043] refer to figure 1, is a flow chart of a SAR imaging method based on fusion of space domain support regions of the present invention; wherein the SAR imaging method based on fusion of space domain support regions comprises the following steps:

[0044] Step 1, determining the airborne synthetic aperture radar, the airborne synthetic aperture radar transmits signals and receives echo signals, and records the echo signals as sub-aperture echo data.

[0045] Specifically, refer to figure 2 , is a schematic diagram of the SAR imaging geometric model in the three-dimensional space Cartesian coordinate system XOYZ of the present invention; wherein in the three-dimensional coordinate system XOYZ, the airborne synthetic aperture radar works in the strip mode, and the carrier aircraft of the airborne synthetic aperture radar operates at a horizontal velocity v Fly along the X direction (that is, the azimuth direction of the airborne synthetic aperture radar), H is the flight he...

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Abstract

The invention discloses an SAR imaging method based on spatial domain support area fusion, mainly comprising the following steps: acquiring sub-aperture echo data; carrying out 2D fast Fourier transform, range matching filtering, phase compensation, expanded stolt interpolation and range pulse compression on the sub-aperture echo data, and getting range distance domain-azimuth wave number domain sub-aperture data after range pulse compression through calculation; de-chirping the range distance domain-azimuth wave number domain sub-aperture data after range pulse compression to get de-chirped range distance domain-azimuth wave number domain sub-aperture data, carrying out azimuth inverse fast Fourier transform on the de-chirped range distance domain-azimuth wave number domain sub-aperture data to get 2D position domain sub-aperture data, and calculating imaging data of each sub-aperture; and getting an azimuth focused full-aperture high-resolution SAR image.

Description

technical field [0001] The invention belongs to the technical field of SAR imaging, and in particular relates to a SAR imaging method based on fusion of space domain support regions, which is suitable for SAR imaging processing of airborne or spaceborne platforms. Background technique [0002] As an active detection tool, SAR (Synthetic Aperture Radar) can perform high-resolution microwave imaging of the observation scene, and is widely used in the field of remote sensing. It obtains high-resolution characteristics in the distance dimension by transmitting broadband signals, while the azimuth dimension uses platform Doppler information generated by motion achieves high resolution. [0003] In recent years, with the maturity and development of various imaging algorithms, while taking into account the imaging quality, real-time performance has become an essential requirement for many imaging systems. The concept of sub-aperture has solved the contradiction between imaging qual...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9011G01S13/904
Inventor 梁毅赵衍一怀园园
Owner XIDIAN UNIV
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