共查询到19条相似文献,搜索用时 62 毫秒
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依据某航天类项目的应用,提出了实时观测系统中数据引导的补偿方法,针对实时系统中的数据野值提出了剔除策略,给出了数据延迟问题的解决办法,并通过实例演示了编程实现,该方法对航天测控类应用具有普遍意义。 相似文献
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单星定位技术由于具有隐蔽性高和设备简单等优势,在军事、民用方面都具有广阔的应用前景,但是同时也存在着定位时间长,卫星飞行成本高等问题。由于卫星在对地表辐射源的定位过程中,需要使用接收信号的多普勒频率进行位置解算,因此文中通过信号外推的方法,将卫星的接收信号进行合理外推,获得更多的多普勒信息,在保证一定定位精度的同时,减少了卫星的飞行时间与飞行成本。文中的研究内容主要集中在信号外推与单星定位两种算法的研究上,并将两种算法进行结合。鉴于此,文中对信号外推与单星定位算法进行了理论分析和仿真验证,主要研究内容包含以下几方面:首先,建立了单星定位中信号外推方法的模型与实现流程,并分别介绍了经典的Gerchberg-Papoulis外推算法,单星定位的数学模型与辐射源位置解算方法;其次,通过对线性调频信号的外推的研究,引入了分数傅里叶变换的概念,在实现了线性调频信号外推之后,将其外推方法类比到卫星接收信号的外推中,并且得到了信号的多普勒频率;最后,通过Satellite Tool Kit(STK)软件的仿真得到卫星的飞行速度、位置等星历信息,与多普勒频率一起代入单星定位的算法中。结果显示文中提出的... 相似文献
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在最近几年的广州市管线放线测量工作中,不少单位采用报建图,是南方测绘的CASS基础地形数据的管线设计图,因此必须向广州市管线信息系统(GUPIS)数据转换。通过分析它们的结构特点与导入到管线信息数据库的数据要求,提出相应的转换方法,编制了图形数据转换的LISP程序,完成了对复杂地物和管线的图层、线型、颜色的自动分类和转换处理,介绍CASS转换菜单的生成,列举应用于广州某公司的从化区的报建放线测量项目转换的成功案例,提高了生产效率,可为同类项目提供参考。 相似文献
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人机交互式电子白板系统是基于对光信息的处理,由计算机,投影设备,特殊光笔组成的多媒体工具。为了实现光笔对光标的控制,系统需要通过CCD对光点信号进行采集和处理,得到特殊光点的二维坐标,因此必须对屏幕上点进行坐标定位和转换。采用屏幕三点线性定位的方法,利用数据库查表进行坐标转换,使得屏幕坐标和CCD坐标的一一对应,实现系统的功能。 相似文献
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针对地面激光点云与影像数据的融合,提出一种利用激光点云反射强度值将点云三维数据化为二维图像信息,根据图像的情况从多种图像平滑的方法中利用图像客观质量评价选择出一种最优的图像平滑的方法将激光反射强度图像进行去噪,最后利用激光反射强度图像与影像的匹配得到同名点,从而实现激光点云数据与影像数据的配准达到数据的融合。 相似文献
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介绍一种基于PC的PPI显示系统的设计与实现。为满足雷达回波实时显示的要求,研究了距离-方位极坐标与光栅显示直角坐标的快速转换算法;为实现传统PPI显示器荧光点余辉效应的模拟,提出了基于回波数据上报周期递减显示像素色深的方法;为满足叠加数字地图和航迹等信息的要求,提出了基于图层的显示数据管理算法。文中提出的设计和算法较好地满足了上述功能和性能要求,研究成果应用于某目标探测系统取得了较好的效果。 相似文献
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Wei-Shiu Wang Chang-Huan Liu 《Industrial Electronics, IEEE Transactions on》1994,41(2):163-172
This paper presents the design and implementation of a multiprocessor system for real-time robot motion control. Full inverse dynamics compensation control laws in both joint and Cartesian spaces are used for developing parallel computation algorithms. The algorithms are divided into subtasks which are distributed among a fixed number of processors based on heuristic scheduling algorithms. The control laws are real-time tested on an experimental robot. The results present a feasible way for improving controller performance of current industrial robots.<> 相似文献
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为提高太阳能电池光电转换效率,设计了不得一种太阳能双轴全自动聚光跟踪控制系统,使可以放多个太阳能电池模块的框架平台可以跟踪太阳光旋转,并保持框架平台上的太阳能电池与阳光入射角保持垂直,以达到光能的最大获取率。在考虑太阳的运动轨迹模型的基础上,设计出可以同时跟踪太阳轨迹的二轴框架平台结构,方位轴和俯仰轴。在考虑晴天和阴天等复杂天气情况下,设计太阳运行轨迹跟踪方式和光传感器跟踪方式相结合的自适应智能跟踪方法,全自动地准确跟踪太阳的位置,跟踪精度小于0.4°,最大限度的接收太阳能,提高了太阳能光电转换的效率。 相似文献
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Lo Bello L. Kaczynski G.A. Mirabella O. 《Industrial Informatics, IEEE Transactions on》2005,1(3):151-161
In modern process control systems, Ethernet is achieving a leading position, proposing itself as a network capable of supporting all communication needs at all levels in the Computer Integrated Manufacturing hierarchy. The main obstacle to using Ethernet at the Field level is the nondeterminism of the Ethernet MAC protocol, which cannot provide real-time traffic with bounded channel access times. This paper focuses on industrial applications featuring soft real-time constraints, such as periodic control or industrial multimedia, which do not require deterministic guarantees on deadline meeting. To cope with this class of applications, Ethernet should be able to guarantee the timely delivery of real-time packets in statistical terms. The paper presents fuzzy traffic smoothing, a technique to perform adaptive traffic smoothing over Ethernet networks at the Field level thus enabling them to provide a statistical bound on packet delivery time. Previous work showed that the fuzzy smoother outperforms other adaptive smoothers proposed in the literature. This paper addresses fuzzy smoother optimization through genetic algorithms. The proposed optimization is applied to tune the inference engine membership functions. The results obtained show the effectiveness of the approach. 相似文献
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G. L. Olson J. A. Roth P. D. Brewer R. D. Rajavel D. M. Jamba J. E. Jensen B. Johs 《Journal of Electronic Materials》1999,28(6):749-755
We describe an integrated real-time sensing and control system for monitoring and controlling substrate temperature, layer
composition, and effusion cell flux during molecular beam epitaxial growth of HgCdTe epilayers for advanced IR detectors.
Substrate temperature is monitored in real-time using absorption-edge spectroscopy, allowing the temperature to be controlled
within 1.5°C of the desired setpoint. In situ spectroscopic ellipsometry (SE) is used for monitoring HgCdTe layer composition in real-time. A comprehensive temperature-
and composition-dependent dielectric function database has been recorded which allows the accurate and precise determination
of Hg1−xCdxTe layer composition over a wide range of x-values, from 0.2 to 0.42. The composition changes inferred from real-time SE measurements
obtained during growth of a two-layer structure are in excellent agreement with composition profiles obtained using post-growth
secondary ion mass spectroscopy analysis. The accuracy and precision of SE measurements conducted over multiple growth runs
are shown to be suitable for robust SE-based composition control. Changes in the Cd flux produced by a CdTe effusion cell
are detected using an atomic optical absorption method. This method allows changes in HgCdTe layer composition to be correlated
directly with variations in Cd flux. All of the in situ sensors are linked using a custom software framework to provide the foundation for real-time monitoring and control of HgCdTe
MBE growth of high performance infrared detector structures over a wide range of compositions, layer thicknesses, and substrate
temperatures. 相似文献
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由于飞艇惯性大,响应时间长,机动性低,为了提高机动性,采用基于LMI线性矩阵不等式的方法设计控制律算法,为了验证飞艇控制律的性能,在Matlab的XPC实时仿真平台基础上,搭建半物理仿真平台,研究了宿主/目标机和飞控计算机及地面操作站之间通过串口和反射光纤组成的反射内存网实现宿主/目标机和飞控计算机及地面操作站之间的信息通讯。系统实时仿真的结果表明,该系统能直观有效地验证各种控制律算法的性能,为飞控算法移植到工程应用中提供了有益的参考。 相似文献