共查询到20条相似文献,搜索用时 46 毫秒
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为了实现北斗B1C+B1I信号的联合生成,提出一种基于软件无线电和图形处理器(graphics processing unit, GPU)加速的北斗B1宽带复合信号的实时生成方法,该方法针对单边带复数二进制偏移载波(single-sideband complex binary offset carrier, SCBOC)调制方式的信号体制进行设计,系统根据用户配置的接收机运动轨迹和星历文件,生成中频信号并通过射频端发射。为了进一步提升GPU并行运算速度,从优化设备内存结构、设计并行线程架构和统一计算设备架构流(compute unified device architecture stream, CUDA)加速3个方面,设计了基于异步运算的加速采样点数据计算的CUDA优化实现方案。测试结果证明,优化后的算法可以基于SCBOC调制实时生成北斗B1I+B1C信号,基于GTX3060的GPU平台,信号90 M采样率下能实现8颗卫星复合信号的实时生成。 相似文献
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复杂目标RCS(radar cross section)物理光学法(physical optics,PO)计算的最大难点是目标曲面之间相互遮挡关系的确定和消隐处理。首先将任意复杂目标用非均匀有理B样条(NURBS)曲面描述,并通过Cox-DeBoor算法将NURBS曲面拆分为拼接有理Bézier曲面。然后利用Trimmed NURBS技术很好地解决了物理光学积分中Bézier曲面之间的遮挡消隐问题。最后,提出了Trimmed NURBS曲面快速积分新方法,实现了导体目标物理光学散射场的快速计算。数值算例验证了方法的有效性和准确性。 相似文献
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拥有高精度蒙皮和复杂骨骼绑定关系的骨骼动画,渲染时存在很大的性能瓶颈。以往研究采用GPU加速动画,但高端GPU成本过高,而中低端GPU的通用计算性能有时不如高端CPU。为充分挖掘算法在多核CPU上的执行性能,弥补中低端GPU通用计算性能的不足,提出了基于Open CL的针对指令和线程的新兴集成并行方案,并与基于SSE结合Open MP针对指令和线程的传统独立并行方案展开对比。实验结果表明,在多数CPU和多种复杂度的数据上,基于Open CL的新兴并行方案的性能明显高于基于SSE的传统并行方案,并且性能优势随着数据复杂度的增加而提升。 相似文献
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《系统工程理论与实践》2014,(5)
正August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献
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《系统科学与系统工程学报(英文版)》2014,(2)
正AF:Any Field The School of Economics and Management at Tsinghua University(Tsinghua SEM)invites applications for faculty positions at all levels(Assistant Professor,Associate Professor and Full Professor)in any fields of business administration and management.Tsinghua SEM is the only school 相似文献
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The paper is about negotiating with issues that discourage innovation. The subject is environmental deterioration, with concern directed at the impediments that keep it from being innovatively resolved. The paper is organized around three issues. (1) The dominant model of environmental concern, called environmental protection, is managed predominantly via command and control approaches. (2) Command and control, by relying on analytical segmentation to subdivide the problem into digestible bits and using formal legislation to direct it, are not up to emerging challenges in the area. (3) More robust models are available but difficult to experiment with due to impediments that discourage change. These impediments are seen in ideals associated with protection, prevention, recycling, and sustainability that tend to do more to sustain harmful practices than to seek beneficial alternatives. Being able to appreciate the underlying restrictions of entropy could help stimulate a more innovative agenda. These issues are tested via a project funded by the EPA entitled ENERGY STAR Homes. 相似文献
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This paper presents an outline of an Oriental systems methodology: the Wuli Shili Renli approach (WSR). The basic theme of WSR contends that wuli (regularities in objective existence), shili (ways of seeing and doing), and renli (patterns underlying human relations) constitute a differentiated whole that conditions systems projects. WSR suggests that we should design and employ appropriate methods to address and tackle wuli shili and renli elements in a theoretically informed and systemic way. The background, philosophy, process, principles, and some practical applications of the methodology are preliminarily outlined. 相似文献
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