Generalized polar coordinate imaging method for synthetic aperture radar (SAR)

A technology of synthetic aperture radar and imaging method, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., which can solve the problem of increasing research costs and not being able to simultaneously take into account spotlight SAR, sliding spotlight SAR and TOPSSAR, etc. question

Inactive Publication Date: 2014-09-24
XIDIAN UNIV
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Problems solved by technology

[0006] The above imaging processing algorithms are only for one synthetic aperture radar SAR mode, but cannot take into account the three modes of spotlight SAR, sliding spotlight SAR and TOPS SAR at the same time
For different modes of beam pointing synthetic aperture radar (BS-SAR), it is necessary to install corresponding imaging processing modules on the carrier aircraft, which increases the research cost and brings a lot of inconvenience when the imaging scene is unknown

Method used

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  • Generalized polar coordinate imaging method for synthetic aperture radar (SAR)
  • Generalized polar coordinate imaging method for synthetic aperture radar (SAR)
  • Generalized polar coordinate imaging method for synthetic aperture radar (SAR)

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Embodiment Construction

[0067] refer to figure 1 , illustrate the generalized polar coordinate imaging method of a kind of synthetic aperture radar SAR that the present invention proposes, and its concrete steps are as follows::

[0068] Step 1: Synthetic aperture radar SAR receives the echo signal of the target, and obtains the range wavenumber domain signal s(K r ,t a ).

[0069] 1a) performing pulse pressure processing on the echo signal in the range time domain;

[0070] 1b) Perform Fourier transform on the echo signal after pulse pressure processing in the distance direction, and then transform it into the distance wavenumber domain to obtain the range wavenumber domain signal s(K r ,t a ) expression is:

[0071] s ( K r , t a ) = σ W r ( K r ...

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Abstract

The invention discloses a generalized polar coordinate imaging method for a synthetic aperture radar (SAR), and relates to the field of radar signal processing. The method comprises the following steps: 1, receiving an echo signal of a target through the SAR, and acquiring a distance wavenumber domain signal from the echo signal; 2, performing orientation dechirp on the distance wavenumber domain signal by using an orientation dechirp function; 3, acquiring a phase-compensated signal; 4, performing Fourier inversion on the phase-compensated signal in a distance direction, and performing scaling, phase correction and phase protection operation to obtain a final imaging result. By adopting the generalized polar coordinate imaging method, the vehicle load test cost can be lowered, and different scene requirements are met.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and relates to the focusing of beam-pointing synthetic aperture radar (BS-SAR), in particular to a generalized polar coordinate imaging method of synthetic aperture radar SAR, which can be used for airborne and spaceborne platforms Synthetic Aperture Radar (SAR) imaging processing. Background technique [0002] In recent years, there have been more and more researches on Synthetic Aperture Radar (SAR). Synthetic Aperture Radar (SAR) is an all-time, all-weather, high-resolution remote sensing device. In addition, synthetic aperture radar SAR can also work in different polarization modes at different frequencies and different observation angles. These characteristics of synthetic aperture radar SAR make it a flexible and effective tool for obtaining information. Synthetic aperture radar SAR can also produce high-resolution, high-precision images. Synthetic aperture radar imaging belongs t...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S7/41G01S13/904G01S13/9047G01S13/9004G01S13/9052
Inventor 孙光才左绍山邢孟道保铮
Owner XIDIAN UNIV
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