SAR (synthetic aperture radar) echo simulating method based on GPU (graphics processing unit) parallel computing

A Technology of Echo Simulation and Parallel Computing

Active Publication Date: 2013-06-26
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to overcome the defects of the existing technology and solve the contradiction between the speed and accuracy of the current interference SAR echo

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  • SAR (synthetic aperture radar) echo simulating method based on GPU (graphics processing unit) parallel computing
  • SAR (synthetic aperture radar) echo simulating method based on GPU (graphics processing unit) parallel computing
  • SAR (synthetic aperture radar) echo simulating method based on GPU (graphics processing unit) parallel computing

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Embodiment Construction

[0024] like figure 1 As shown, a fast simulation method for SAR echoes based on GPU parallel computing, the implementation of this method is a three-layer loop, the number of outermost loops is the number of azimuth sampling points, and the inner two-layer loop is used to calculate the azimuth echo, followed by The azimuth echo is convolved with the transmitted signal, which is performed in the outermost loop. Like the two-dimensional time-domain algorithm, the azimuth echo signal operation is mapped to the two-dimensional thread grid, and the outer loop is realized by calling the kernel function multiple times. Assume that the sampling points of the echo data in the azimuth direction and the range direction are N respectively a and N r , then N can be turned on in the GPU a ×N r threads to compute the azimuth echo signals in parallel, taking into account antenna pattern gain and Doppler phase contributions. Call the GPU kernel function to traverse the azimuth time, so as...

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Abstract

The invention provides an SAR (synthetic aperture radar) echo simulating method based on GPU (graphics processing unit) parallel computing, overcomes defects on influencing SAR echo simulating speed and accuracy, and improves influencing SAR echo simulating speed. The method includes the steps of setting up scene scattering point mesh generation and making sure position relation of double antenna SAR and scene targets; building up backscattering coefficient model, and generating correlated backscattering coefficient pairs according to sight relation of double antenna SAR and ground scene so as to complete backscattering coefficient computing; calculating positioning echo signals in SAR irradiating area; performing convolution to positioning echo signals acquired in step 3 and transmitting signals to acquire current pulsing echo signals; and going through all positioning times to acquire SAR echo data influenced by double antenna in the whole scene.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a SAR echo simulation method based on GPU parallel computing. Background technique [0002] Interferometric SAR echo signal simulation, based on the principle of SAR data acquisition, uses computer simulation of multi-channel original echo data, and plays an important role in system parameter design and verification, SAR imaging processing algorithm verification, interference processing algorithm verification, interferometric SAR performance analysis, etc. important role. [0003] A lot of research has been done on SAR echo simulation at home and abroad, which can be divided into two-dimensional time domain algorithm, one-dimensional frequency domain algorithm, two-dimensional frequency domain algorithm and inverse imaging echo algorithm. The two-dimensional time-domain algorithm is a complete time-domain calculation algorithm, which is often used in the simulation of po...

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Application Information

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IPC IPC(8): G01S7/40
Inventor 汪丙南韦立登向茂生梁兴东丁赤飚
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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