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Missile-borne SAR forward-squint imaging method based on GPU

An imaging method and forward squint technology are applied in the directions of radio wave reflection/re-radiation, special data processing applications, and utilization of re-radiation, etc., which can solve the problems of complex parallel system structure and high hardware cost, so as to reduce hardware cost and reduce imaging The effect of time and cheap cost

Inactive Publication Date: 2015-03-25
XIDIAN UNIV
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Problems solved by technology

Most of the current missile-borne SAR forward squint parallel imaging processing is based on platforms such as DSP and FPGA, which not only leads to complex parallel structure of the system, but also high hardware cost

Method used

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  • Missile-borne SAR forward-squint imaging method based on GPU
  • Missile-borne SAR forward-squint imaging method based on GPU
  • Missile-borne SAR forward-squint imaging method based on GPU

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing:

[0023] refer to figure 1 , is a flow chart of the GPU-based forward squint imaging method for missile-borne SAR of the present invention. In the embodiment of the present invention, the main processing steps of imaging are performed on the GPU, and the range-wise processing includes range-wise pulse compression, range-walk correction and Doppler center compensation, range-bending correction, secondary range-pulse compression, and azimuth-wise pulse compression. The processing includes compensating the high-order phase of non-spatial variation in azimuth, filtering the high-order phase, compensating the residual high-order phase, and multiplying by Deramp function. These processes are completed in 4 kernel functions on the GPU side, of which the first kernel function and the second kernel function are mainly responsible for the processing of the distance direction, and the ...

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Abstract

The invention belongs to the technical field of missile-borne SAR imaging, and particularly relates to a missile-borne SAR forward-squint imaging method based on a GPU. The method comprises the specific steps that the work parameter of a synthetic aperture radar is set on a GPU side, and stored in the GPU, and SAR raw echoed data are stored in the GPU in a matrix mode; on the GPU side, distance direction processing is carried out on an SAR raw echoed data matrix, and distance orientation two-dimensional time domain data are obtained; on the GPU side, zero padding expansion is carried out on a distance orientation two-dimensional time domain data matrix in the azimuth, and a distance orientation two-dimension time domain data matrix of Na'*Nr is obtained after azimuth zero padding expansion; on the GPU side, azimuth processing is sequentially carried out on the distance orientation two-dimension time domain data matrix obtained after azimuth zero padding expansion, and focused SAR image data are obtained.

Description

technical field [0001] The invention belongs to the technical field of missile-borne SAR imaging, in particular to a GPU-based forward-squint imaging method for missile-borne SAR. Background technique [0002] With the development of synthetic aperture radar imaging technology, missile-borne SAR combining synthetic aperture radar (SAR) with precision guidance technology has become a research hotspot in recent years. Since the missile-borne SAR requires high resolution to obtain more target information, the shape and fine structure of the target can be presented more clearly, thereby greatly improving the ability to identify the target and the ability to strike accurately; and in the military, the missile-borne SAR Usually after the investigation is completed, the attack needs to be completed. In order to ensure that the missile has a certain turning maneuver time, the missile-borne SAR generally needs to be imaged under the condition of forward squint. Therefore, the imagin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G06F19/00
CPCG01S13/904G01S13/9004
Inventor 梁毅邢孟道杜凡李震宇
Owner XIDIAN UNIV
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