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1.
由于天线在不同的子带进行扫描,星载扫描模式不能像条带模式那样,获得连续的方位向相位历史,利用条带模式高精度处理算法(如距离一多普勒算法)处理ScanSAR数据,通过在脉冲扫描间隔中填零,把扫描数据看成中间填零的相干脉冲串序列,等效成条带SAR数据,利用条带模式的处理算法进行成像。针对填零后的数据,数据量大,可以采用基于通用图形处理单元的并行处理技术,加快处理速度。对填零处理形成的栅瓣调制,通过滤波进行消除。这样处理的图像和条带模式的图像具有相同的辐射和几何分布特性,有效抑制扇贝效应带来的影响。对实测星栽ScansAR数据进行成像处理,试验结果表明该方法的有效性。  相似文献   
2.
The library PRAND for pseudorandom number generation for modern CPUs and GPUs is presented. It contains both single-threaded and multi-threaded realizations of a number of modern and most reliable generators recently proposed and studied in Barash (2011), Matsumoto and Tishimura (1998), L’Ecuyer (1999,1999), Barash and Shchur (2006) and the efficient SIMD realizations proposed in Barash and Shchur (2011). One of the useful features for using PRAND in parallel simulations is the ability to initialize up to 10191019 independent streams. Using massive parallelism of modern GPUs and SIMD parallelism of modern CPUs substantially improves performance of the generators.  相似文献   
3.
The Grover quantum search algorithm, one of only a few representative quantum algorithms, can speed up many classical algorithms that use search heuristics. No true quantum computer has yet been developed. For the present, simulation is one effective means of verifying the search algorithm. In this work, we focus on the simulation workflow using a compute unified device architecture (CUDA). Two simulation workflow schemes are proposed. These schemes combine the characteristics of the Grover algorithm and the parallelism of general-purpose computing on graphics processing units (GPGPU). We also analyzed the optimization of memory space and memory access from this perspective. We implemented four programs on CUDA to evaluate the performance of schemes and optimization. Through experimentation, we analyzed the organization of threads suited to Grover algorithm simulations, compared the storage costs of the four programs, and validated the effectiveness of optimization. Experimental results also showed that the distinguished program on CUDA outperformed the serial program of libquantum on a CPU with a speedup of up to 23 times (12 times on average), depending on the scale of the simulation.  相似文献   
4.
In light of GPUs’ powerful floating-point operation capacity,heterogeneous parallel systems incorporating general purpose CPUs and GPUs have become a highlight in the research field of high performance computing(HPC).However,due to the complexity of programming on GPUs,porting a large number of existing scientific computing applications to the heterogeneous parallel systems remains a big challenge.The OpenMP programming interface is widely adopted on multi-core CPUs in the field of scientific computing.To effectively inherit existing OpenMP applications and reduce the transplant cost,we extend OpenMP with a group of compiler directives,which explicitly divide tasks among the CPU and the GPU,and map time-consuming computing fragments to run on the GPU,thus dramatically simplifying the transplantation.We have designed and implemented MPtoStream,a compiler of the extended OpenMP for AMD’s stream processing GPUs.Our experimental results show that programming with the extended directives deviates from programming with OpenMP by less than 11% modification and achieves significant speedup ranging from 3.1 to 17.3 on a heterogeneous system,incorporating an Intel Xeon E5405 CPU and an AMD FireStream 9250 GPU,over the execution on the Xeon CPU alone.  相似文献   
5.
长期以来,单精度似乎与科学计算无缘,然而从体系结构看,混合精度计算可以充分发挥向量部件、GPGPU设备的单精度性能,提供更高的效能,如降低通讯带宽要求、提高数据传输和通讯效率等。混合精度显格式有限元算法,结合材料强非线性多尺度有限元程序msFEM,实现了GPGPU上的有效加速。实验结果表明:混合精度显格式有限元程序实现了90%以上的计算通过单精度完成,其计算结果与全部使用双精度的结果相一致。该算法可以使得在不支持双精度格式的加速卡上实现科学计算功能。在支持双精度浮点格式的GPU上,混合精度算法与全部采用双精度计算相比其加速效果提高了1.6~1.7倍。  相似文献   
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7.
General-purpose graphics processing unit (GPGPU) plays an important role in massive parallel computing nowadays. A GPGPU core typically holds thousands of threads, where hardware threads are organized into warps. With the single instruction multiple thread (SIMT) pipeline, GPGPU can achieve high performance. But threads taking different branches in the same warp violate SIMD style and cause branch divergence. To support this, a hardware stack is used to sequentially execute all branches. Hence branch divergence leads to performance degradation. This article represents the PDOM (post dominator) stack as a binary tree, and each leaf corresponds to a branch target. We propose a new PDOM stack called PDOM-ASI, which can schedule all the tree leaves. The new stack can hide more long operation latencies with more schedulable warps without the problem of warp over-subdivision. Besides, a multi-level warp scheduling policy is proposed, which lets part of the warps run ahead and creates more opportunities to hide the latencies. The simulation results show that our policies achieve 10.5% performance improvements over baseline policies with only 1.33% hardware area overhead.  相似文献   
8.
In large vocabulary continuous speech recognition (LVCSR) the acoustic model computations often account for the largest processing overhead. Our weighted finite state transducer (WFST) based decoding engine can utilize a commodity graphics processing unit (GPU) to perform the acoustic computations to move this burden off the main processor. In this paper we describe our new GPU scheme that can achieve a very substantial improvement in recognition speed whilst incurring no reduction in recognition accuracy. We evaluate the GPU technique on a large vocabulary spontaneous speech recognition task using a set of acoustic models with varying complexity and the results consistently show by using the GPU it is possible to reduce the recognition time with largest improvements occurring in systems with large numbers of Gaussians. For the systems which achieve the best accuracy we obtained between 2.5 and 3 times speed-ups. The faster decoding times translate to reductions in space, power and hardware costs by only requiring standard hardware that is already widely installed.  相似文献   
9.
针对山地地形海量数据的特点,基于GPU的Geometrical Clipmap算法,应用简化的工作流程,结合GPGPU技术,采用了一种更为合理的高程数据组织交换模式,通过引入高程误差数据巧妙地解决不同分辨率之间的裂缝问题,并对高分辨率的遥感影像作为地形纹理的实现方法加以补充,进而实现可应用于虚拟现实系统的海量地形数据的实时可视化.  相似文献   
10.
对现代雷达信息处理的任务进行了分析,介绍了雷达信息处理系统的发展现状。结合计算机技术的发展,对基于通用处理器和GPGPU的新型设计方案进行了描述。  相似文献   
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