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  • Comparison of three filters in asteroid-based autonomousnavigation 相关:celestial MECHANICS -
  • At present, optical autonomous navigation has become a key technologyin deep space exploration programs. Recent studies focus on the problem of orbit de-termination using autonomous navigation, and the choice of filter is one of the mainissues. To prepare for a possible exploration mission to Mars, the primary emphasisof this paper is to evaluate the capability of three filters, the extended Kalman filter(EKF), unscented Kalman filter (UKF) and weighted least-squares (WLS) algorithm,which have different initial states during the cruise phase. One initial state is assumedto have high accuracy with the support of ground tracking when autonomous navi-gation is operating; for the other state, errors are set to be large without this support.In addition, the method of selecting asteroids that can be used for navigation fromknown lists of asteroids to form a sequence is also presented in this study. The simula-tion results show that WLS and UKF should be the first choice for optical autonomousnavigation during the cruise phase to Mars.
  • 云计算环境下多GPU资源调度机制研究 相关:云计算 GPU(graphics Processing
  • 资源调度是云计算中的关键问题之一,它的调度机制与算法直接影响到云计算系统的性能及成本.GPU(graphics processing unit)正越来越多地被应用到通用计算领域,作为高性能云计算系统中的特殊计算资源,对GPU计算资源的调度有其特殊性.综合考虑计算任务在节点间以及节点内部的数据传输延迟,以充分利用系统GPU计算资源、掩藏传输延迟为目标,研究了云环境下多GPU的"传输&传输&执行"三段调度问题.提出一种云环境下GPU计算资源调度机制MGSC(Multi-GPU resource Scheduling scheme in Cloud environment):考虑了GPU计算中传输与计算的因素,讨论了在GPU计算中出现的四种资源需求情况,建立GPU计算资源模型;为了减轻中心节点的任务处理压力,设计了基于树型结构的GPU资源分布式检索算法.实验结果说明,MGSC在满足多用户共享GPU计算资源的同时,能够较好地提高云计算系统中GPU计算资源利用率,获得较高的服务质量,有效地减少资源闲置,降低服务提供者的服务成本.
  • 雷达测距综合实训平台的设计与实现 免费阅读 下载全文 相关:AVR Arduino Uno
  • 介绍了一个典型的基于AVR架构处理器的测距实训平台的设计方案,处理器采用Atmel公司的ATmega328,测距雷达使用HC-SR04超声波测距模块,PPI显示界面采用processing设计,通过对Arduino Uno开发板端口和库文件的分析,以及HC-SR04驱动波形和逻辑要求的理解,实现了由ATmega328控制HC-SR04通过上位机显示雷达测距的设计方案。
  • 机载前视阵雷达阵元误差稳健的空时插值补偿方法 免费阅读 下载全文 相关:阵元误差 空时插值 距离依赖性
  • 空时插值方法通过对地面杂波空时导向矢量进行插值变换,能够有效地降低机载前视阵雷达地面杂波的距离依赖性,改善空时自适应处理器的杂波抑制性能。然而,当机载雷达接收通道存在阵元误差时,该方法对接收的数据处理失效。针对该问题,提出一种稳健的空时插值方法,该方法在杂波空时导向矢量周围选取约束导向矢量,然后进行插值变换,补偿地杂波距离依赖性。仿真结果表明,当机载雷达接收通道存在阵元误差时,该方法能够有效地降低接收的地杂波数据的距离依赖性,提高空时自适应处理器的杂波抑制性能。
  • 知识辅助的机载MIMO雷达STAP非均匀样本检测方法 免费阅读 下载全文 相关:机载多输入多输出雷达 空时自适应处理 知识辅助
  • 针对样本协方差矩阵受干扰目标污染时机载多输入多输出(multiple-input multiple-output,MIMO)雷达空时自适应处理(space-time adaptive processing,STAP)目标检测性能下降的不足,提出一种知识辅助(knowledge-aided,KA)的广义内积非均匀样本检测方法。首先利用扁长椭球波函数估计的杂波子空间知识,离线构造杂波协方差矩阵,然后与广义内积非均匀检测器(generalized inner product non-homogeneity detector,GIP NHD)结合,实现对训练样本的有效选择,使目标检测不受训练样本中干扰目标的影响。仿真结果表明,相对于常规 GIP 方法,KA-GIP 方法能够对存在干扰目标的样本进行更加有效地剔除,并且机载 MIMO 雷达 STAP 的目标检测性能得到显著提升,因此更有利于实际工程应用。
  • 基于新疆准东基地水源地地下水开采方案的数值模拟 免费阅读 下载全文 相关:地下水 数值模拟 Processing
  • 为探究新疆准东基地水源地地下水开采量可实行方案与地下水水位下降状况,采用Processing MODFLOW软件,对项目区进行地下水数值模拟研究。经过模拟流场形态与观测值以及对地下水动态进行拟合,提取地下水梯度场、降速场与实测资料进行对比分析。总结得出符合该地区地下水变化的地下水开采量方案。研究表明该水源地地下水开采实施方案符合该地区水资源长期发展。
  • GPU上两阶段负载调度问题的建模与近似算法 免费阅读 下载全文 相关:GPU(graphics Processing unit)
  • 随着硬件功能的不断丰富和软件开发环境的逐渐成熟,GPU(graphics processing unit)越来越多地被应用到通用计算领域,并对诸多计算系统(尤其是嵌入式系统)性能的显著提升起到了至关重要的作用.在基于GPU的计算系统中,大规模并行负载同时进行数据传输和加载的情况时常发生,数据传输延时在系统性能全局最优化中变得不容忽视.综合考虑负载的传输时间和执行时间,以总负载makespan最小化作为系统性能的全局优化目标,研究了GPU上负载“传输-执行”联合调度问题.首先,将负载的时间信息和并行任务数与矩形域的二维空间联系起来,建立了负载的2D双层矩形域模型;然后,将GPU上负载调度问题归结为一类Strip-Packing问题;最后,基于贪婪策略给出了近似度为3的多项式时间近似算法,算法复杂度为O(nlogn).该近似算法的核心是对数据传输阶段进行负载排序调度.这从理论层面上证明了GPU系统采取“传输。执行”两阶段调度的有效性,即,在数据传输阶段采取负载排序调度,在负载执行阶段采取先来先服务(first-come-first-serve,简称FCFS)调度,能够使GPU性能达到全局最优或近似最优.
  • 基于Processing的人机交互游戏开发 免费阅读 下载全文 相关:PROCESSING KINECT
  • 随着数字化体验时代的发展,人们越来越关注自然的人机交互方式。体感技术作为一种最新的交互体验方式,也越来越多地受到人们的重视,体感技术通过多种技术手段把虚拟平台和现实平台相结合,实现自然地人机交互方式。本文基于Processing进可视化编程,并基于Kinect进行多目标跟踪实现准确地识别和交互,致力于实现自然和谐、身临其境的虚拟游戏体验。
  • Some Aspects of Physical-mechanical Properties of Apple (Malus domestica) Cultivars for High Techniques in Manufacturing 免费阅读 下载全文 相关:APPLE HARVEST processing
  • Several mechanical and physical properties of five apple cultivars (Black, Apricot, Jester, Big Ariane and Medium Ariane) had been estimated. The results showed that there were important significant differences among the cultivars in most of the parameters that were measured. Among the cultivars, Black cultivar had the highest fruit mass (207.65 g), followed by Big Ariane (188.34 g) and Medium Ariane (137.49 g). The actual fruit volume (cm3) ranged from 61.77 (Apricot) to 269.67 (Black). The highest geometric, arithmetic, square and equivalent mean diameter values were observed for Big Ariane. The surface area and projected area of cultivars were between 14.53-69 cm2 and 45.56-165.33 cm2, respectively. The maximum coefficient of static friction was obtained on plastic followed by steel, iron and glass; the maximum coefficient of dynamic friction was obtained on glass followed by steel, plastic and iron.
  • Research on Anti-noise Processing Method of Production Signal Based on Ensemble Empirical Mode Decomposition (EEMD) 免费阅读 下载全文 相关:PRODUCTION SIGNAL DENOISING
  • The grain production prediction is one of the most important links in precision agriculture. In the process of grain production prediction, mechanical noise caused by the factors of difference in field topography and mechanical vibration will be mixed in the original signal, which undoubtedly will affect the prediction accuracy. Therefore, in order to reduce the influence of vibration noise on the prediction accuracy, an adaptive Ensemble Empirical Mode Decomposition (EEMD) threshold filtering algorithm was applied to the original signal in this paper: the output signal was decomposed into a finite number of Intrinsic Mode Functions (IMF) from high frequency to low frequency by using the Empirical Mode Decomposition (EMD) algorithm which could effectively restrain the mode mixing phenomenon; then the demarcation point of high and low frequency IMF components were determined by Continuous Mean Square Error criterion (CMSE), the high frequency IMF components were denoised by wavelet threshold algorithm, and finally the signal was reconstructed. The algorithm was an improved algorithm based on the commonly used wavelet threshold. The two algorithms were used to denoise the original production signal respectively, the adaptive EEMD threshold filtering algorithm had significant advantages in three denoising performance indexes of signal denoising ratio, root mean square error and smoothness. The five field verification tests showed that the average error of field experiment was 1.994% and the maximum relative error was less than 3%. According to the test results, the relative error of the predicted yield per hectare was 2.97%, which was relative to the actual yield. The test results showed that the algorithm could effectively resist noise and improve the accuracy of prediction.
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