An Asynchronous Parallel Synthetic Aperture Radar Backprojection Imaging Method

A synthetic aperture radar and back projection technology, applied in the field of radar, can solve the problems that signal processing efficiency cannot be effectively improved, data and transmission engines cannot run at the same time, graphics card hardware resources cannot be fully utilized, etc.

Inactive Publication Date: 2018-11-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, limited by the size of the video memory, when the amount of data to be processed is large, the parallel back projection algorithm between pixels must process the data in blocks
Therefore, when the current inter-pixel parallel back projection algorithm processes data, the data and transmission engine of the GPU cannot run at the same time, resulting in the hardware resources of the graphics card not being fully utilized, so that when the amount of SAR data is large, the signal processing efficiency cannot be effectively improved

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  • An Asynchronous Parallel Synthetic Aperture Radar Backprojection Imaging Method
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  • An Asynchronous Parallel Synthetic Aperture Radar Backprojection Imaging Method

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[0041] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0042] In order to describe content of the present invention conveniently, at first do following term definition:

[0043] Definition 1, CUDA stream

[0044] The CUDA stream represents a graphics processor (Graphics Processing Unit, GPU) operation queue, and the operations in the queue will be executed in a specified order; some operations can be added in the CUDA stream, such as the start of the kernel function, memory copy, And the start and end of events; each stream can be seen as a task on the GPU, and these tasks can be executed in parallel. For details, please refer to the reference: Jason Sander, Edward Kandrot, translated by Nie Xuejun, etc., GPU High Performance CUDA Combat, Machinery Industry Press, 2014.

[0045] Definition 2. Tradi...

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Abstract

The invention discloses an asynchronous parallel synthetic aperture radar backward projection imaging method. By processing the echo data at the host end in blocks in the azimuth direction, the asynchronous parallel function of the CUDA stream is used to transmit and process the data at the same time, making full use of the graphics card resources; the scheme of the present invention has the following advantages: the echo data is divided into blocks in the azimuth direction, and larger-scale data can be processed; asynchronous parallelism is realized with CUDA streams, allowing data transmission and data processing to be carried out simultaneously, so as to hide data at the host end and the transmission time of the device side; data transfer between the host side and the device side uses the function cudaHostAlloc to allocate page-locked host-side memory to ensure that the memory always resides in the physical memory; the CUDA function cudaMemcpyAsync is used during data transmission, and DMA technology can be used To realize the transmission of data between the host end and the device end without the intervention of the CPU.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] SAR is a high-resolution microwave imaging system with all-weather, all-weather capabilities that cannot be achieved with infrared sensing, optical imaging, and the ability to penetrate some coverings. These advantages make SAR very suitable for earth observation, and has a wide range of practical applications in military and civilian applications. [0003] The Back Projection (BP) algorithm is a SAR imaging algorithm based on time-domain coherent processing, which can be applied to SAR imaging of various motion trajectories. The basic idea is to calculate the length from each pixel in the imaging area to the aperture The distance history between the internal SAR antenna platforms, and then the corresponding time-domain echo signals are coherently accumulated to reconstruct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023G01S13/904G01S13/9017
Inventor 刘喆俞咏江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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