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Method for generating echoes of circular synthetic aperture radar based on CPU-GPU heterogeneous computing

A technology of synthetic aperture radar and echo, applied in radio wave measurement system, radio wave reflection/reradiation, utilization of reradiation, etc., can solve problems such as long computing time

Inactive Publication Date: 2014-06-25
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

This kind of calculation involving a large amount of data is performed in the traditional CPU serial mode, which will take a long time to calculate

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  • Method for generating echoes of circular synthetic aperture radar based on CPU-GPU heterogeneous computing
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  • Method for generating echoes of circular synthetic aperture radar based on CPU-GPU heterogeneous computing

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Embodiment Construction

[0023] In order to better understand the technical solutions of the present invention, the implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 is the data acquisition geometry of CSAR, with the center of the target area on the ground plane as the coordinate origin , the ground plane is plane, perpendicular to Plane is axis, to establish a Cartesian coordinate system . The radar has a radius of around the center Make a circular flight at an altitude of .

[0025] The azimuth of the radar is , the radar coordinate position corresponding to each azimuth angle is . define slope distance and down view respectively

[0026] (1)

[0027] (2)

[0028] Assume that the distribution function of the 3D observation target is , the radar transmitted pulse signal is , then the echo signa...

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Abstract

The invention relates to a method for generating echoes of circular synthetic aperture radar based on CPU-GPU heterogeneous computing. The method comprises the steps that firstly, parameters of a radar platform, a target scene and the like are determined; secondly, one CPU thread is set for controlling one GPU through the OpenMP technology and echo data at one orientation pulse are generated through each CPU thread; thirdly, the parameters are copied from each CPU to one GPU controlled by the CPU, the threads are divided in the GPU according to the target point number, and an echo signal containing carrier wave information is calculated; fourthly, the generated echo signal is copied from each GPU to the corresponding CPU, the carrier wave information of the echo signal is removed according to a distance unit, a base band echo signal is obtained, and the base band echo signal is stored in the corresponding CPU; finally, the echo data of all the orientation pulses are collected. According to the method, an OpenMP and CUDA mixed programming model is adopted, so that the efficiency of generation of the echoes of the circular synthetic aperture radar is effectively improved under a large-scale scene condition.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar signal processing, in particular to a method for improving the echo generation speed of circular synthetic aperture radar by utilizing multi-core CPU and multi-core GPU technology. Background technique [0002] In the Circular Synthetic Aperture Radar (CSAR) mode, the radar collects 360-degree circular data around the target. In theory, it can not only obtain sub-wavelength resolution, but also obtain three-dimensional information of the target. This has important implications for several areas of high-resolution and 3D imaging. However, in the actual data collection process, since the radar trajectory is difficult to control as a standard circle, the collected measured data must be pre-processed such as motion compensation before imaging processing, and the quality of the imaging is not high, so it is difficult to be used for imaging Theoretical analysis of performance. [0003...

Claims

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Application Information

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IPC IPC(8): G01S7/32
CPCG01S7/32G01S13/9088
Inventor 喻玲娟方旺盛吴君钦
Owner JIANGXI UNIV OF SCI & TECH
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