The High Resolution Spaceborne SAR Simulation Based On Heterogeneous SIMD

Synthetic Aperture Radar is a kind of radar which can provide a high resolution imaging effect. It can get high resolution radar images in special weather conditions and can penetrate the cover and identify the camouflage. Because of these characteristics, it is widely used in the field of military and civilian.Due to the actual needs and the development of science and technology, there are higher request to SAR resolution and the bandwidth in order to get the high resolution images. So the amount of calculation increases quickly. The echo data is the strong support to imaging algorithm, so how to get the echo data quickly and accurate becomes a problem need to be solved.As the development of the high performance computing, this issue has a very suitable solution. In this paper, on the basis of the fully research in related literature at home and aboard, then reference the parallel simulation algorithm of spaceborne SAR echo simulation, this paper proposes a method of spaceborne SAR echo simulation based on heterogeneous SIMD. Redundant computing and irregular problem aimed at spaceborne SAR have been deeply optimized. The experimental results show that the computing efficiency increases 150 times through the improved CPU/GPU heterogeneous model compared with the serial model.The main research contents and chapters in this paper are as follows:1. Study the relevant technology of the spaceborne SAR, such as model the satellite platforms, the targets, the imaging geometry and the radar signal. Describe the whole process of spaceborne SAR echo simulation and related simulation algorithm. Then implement the serial simulation of spaceborne SAR echo.2. Analyze the parallel simulation algorithm of spaceborne SAR echo based on CPU. And divide the fine-grained tasks of spaceborne SAR echo simulation. Implement the spaceborne SAR simulation on multi-cores based on OpenMP and multi-CPUs based on MPI. At the same time, deeply optimize the SAR echo simulation base on the target partition. At the end of this chapter, implement the spaceborne SAR echo simulation based on OpenMP and SSE/AVX. Then experiment and analyze the result.3. Study the parallel simulation algorithm of spaceborne SAR echo simulation on GPU. Implement the spatial geometry calculation and echo simulation of spaceborne SAR. Due to the particularity of the SAR echo simulation algorithm, there will produce the conflicts and the irregular problems during the simulation. Then analyze the reason of producing the irregular problems. At the end of the chapter, expound two methods of solving the parallel conflicts in the SAR echo simulation, the two methods are respectively based on interpolation and reduction.4. Put forward and implement the spaceborne SAR echo simulation based on improved CPU/GPU heterogenous model. Divide the tasks of the spaceborne SAR echo simulation through the task scheduling and make full use of the computing resources of the computer, implement the spaceborne SAR echo simulation based on improved CPU/GPU synergy. At the end, show the result of the experiment and make the analysis. The result shows that the speed up of the program can be improved more in this way.