Phase correction imaging method used for time-sharing receiving array SAR

A technology of time-sharing reception and phase correction, which is applied in the field of array antenna radar imaging, can solve the problems that the array antenna receives time-division echo signals that have not been published before, and achieves the effect of clear and concise method steps and simple and effective implementation process

Active Publication Date: 2014-03-12
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, under the moving platform, the array antenna adopts time-sharing to receive the echo signal in the process of realizing two-dimensional or three-dimensional imaging, and no related literature has been published or related patents have been applied for.

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  • Phase correction imaging method used for time-sharing receiving array SAR
  • Phase correction imaging method used for time-sharing receiving array SAR
  • Phase correction imaging method used for time-sharing receiving array SAR

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0016] The invention proposes a phase correction imaging method for time-sharing receiving array SAR, which is a time-sharing receiving compensation method for array synthetic aperture radar (SAR) array elements, which utilizes the basic The parameters estimate the primary correction matrix and the secondary correction matrix, and combine the imaging algorithm to complete the focusing process. The forward-looking array SAR on which this method is based is an observation system that uses array antenna technology to image the front and lower areas of the platform, uses pulse compression technology to achieve high resolution in the range direction, and relies on uniformly distributed array antennas to achieve high resolution ...

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Abstract

The invention discloses a phase correction imaging method used for a time-sharing receiving array SAR. The method uses an array antenna controlled by a microwave switch to achieve acquisition of array SAR echo data under a moving platform in a time-sharing manner. A one-order correction matrix is established according to position parameters and platform speed of the platform and scene parameters in the data acquisition process, and the matrix multiplies the echo data in a two-dimensional time domain before range migration correction and range compression, so as to complete a phase correction. Based on the phase correction, range imaging processing aimed at the array SAR is completed. Again, a second-order correction matrix is established according to position parameters and platform speed of the platform and scene parameters in the data acquisition process, and residue phase correction is completed in the two-dimensional time domain after processing on a distance direction is completed. Finally, a focusing processing across a course is performed, so that a two-dimensional image with preferable focusing is obtained.

Description

technical field [0001] The invention relates to the technical field of array antenna radar imaging, in particular to a phase correction imaging method for time-division receiving array SAR. Background technique [0002] Array synthetic aperture radar (SAR) uses array antenna technology to realize two-dimensional or three-dimensional radar imaging, such as figure 1 As shown in Fig. 1, evenly distributed array antennas are placed along the Y direction perpendicular to the moving direction of the carrier platform, forming a synthetic aperture in the cross-direction, transmitting broadband signals in the range direction and then performing pulse compression processing to realize a two-dimensional view of the area in front of the carrier platform. High resolution imaging. [0003] In order to reduce the hardware complexity of the radar system and facilitate the installation on light and small platforms, the microwave switch is used to control the array antenna to realize that th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S7/40G01S13/9017G01S13/904
Inventor 王彦平张英杰谭维贤洪文吴一戎
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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