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3981.通过社交工具和技术进行简单的空间站飞行控制通信和记录保持
[信息传输、软件和信息技术服务业] [2014-04-01]
This paper explores three developmental ground system concepts under development at Johnson Space Center s (JSC) Mission Control Center Houston (MCC-H) and Marshall Space Flight Center s (MSFC) Payload Operations Integration Center (POIC). These concepts could reduce ISS control center voice traffic and console logging yet increase the efficiency and effectiveness of both. The goal of this paper is to kindle further discussion, exploration, and tool development.
关键词：通信；飞行控制；国际空间站；音频通信；计算机网络；人机接口
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3982.支持实时仿真空间链接的硬件和软件集成
[计算机、通信和其他电子设备制造业,信息传输、软件和信息技术服务业] [2014-04-01]
Prior to operational use, communications hardware and software must be thoroughly tested and verified. In space-link communications, field testing equipment can be prohibitively expensive and cannot test to non-ideal situations. In this paper, we show how software and hardware emulation tools can be used to accurately model the characteristics of a satellite communication channel in a lab environment. We describe some of the challenges associated with developing an emulation lab and present results to demonstrate the channel modeling. We then show how network emulation software can be used to extend a hardware emulation model without requiring additional network and channel simulation hardware.
关键词：通信；卫星通信；仿真；实时操作；电脑系统程序
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3983.多次反射继电器的应用以增强机场移动航空通信系统网络的性能
[铁路、船舶、航空航天和其他运输设备制造业,信息传输、软件和信息技术服务业] [2014-04-01]
The proposed technology, known as AeroMACS, will be used to support fixed and mobile ground to ground applications and services. This article proposes and demonstrates that IEEE 802.16j-amendment-based WiMAX is most feasible for AeroMACS applications. This amendment introduces multihop relay as an optional deployment that may be used to provide additional coverage and/or enhance the capacity of the network. Particular airport surface radio coverage situations for which IEEE 802.16-2009-WiMAX provides resolutions that are inefficient, costly, or excessively power consuming are discussed. Our initial simulation results suggest that no additional interference to MSS feeder link is caused by deployment of IEEE 802.16j-based AeroMACS.
关键词：通信；通信网络；C波段；电信
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3984.智能手机辅助快速通信和控制系统全面的系统测试计划
[信息传输、软件和信息技术服务业,计算机、通信和其他电子设备制造业] [2014-04-01]
This thesis contains a test plan and implementation of the plan for the SPARCCS system as well as a formal technical analysis of the system to ensure the proper operation, verification, and validation of the initial SPARCCS functional system. The SPARCCS system and the various wireless technologies upon which the system operates are thoroughly tested in various field and live settings to simulate real-world military and emergency services operations. The tests are designed to determine the optimal configurations of SPARCCS as well as the optimal wireless technologies to be used with SPARCCS for various operational situations.
关键词：通信；指挥控制通信；移动计算机处理技术；无线通信；智能手机辅助快速通信
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3985.集成短距离、低带宽、可穿戴通信网络技术
[信息传输、软件和信息技术服务业] [2014-04-01]
This report provides a summary of research and development (R&D) activity and accomplishments, with respect to the development of SPARNET, for U.S. Army contract number W911QY-11-C-0012 - Integrated Short Range, Low Bandwidth, Wearable Communications Networking Technologies. The research and development (R&D) efforts conducted in this project were aimed at the implementation of an integrated short-range, low-bandwidth, wearable communications, sensing, and networking, based on software-defined-radio (SDR) technology.
关键词：通信；无线电系统；通信网络；短距离；可穿戴通信
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3986.双频(无线电/光学)航天器通信的并行系统工程和风险降低
[信息传输、软件和信息技术服务业,计算机、通信和其他电子设备制造业,铁路、船舶、航空航天和其他运输设备制造业] [2014-03-31]
This paper describes a system engineering approach to examining the potential for combining elements of a deep-space RF and optical communications payload, for the purpose of reducing the size, weight and power burden on the spacecraft and the mission. Figures of merit and analytical methodologies are discussed to conduct trade studies, and several potential technology integration strategies are presented. Finally, the NASA Integrated Radio and Optical Communications (iROC) project is described, which directly addresses the combined RF and optical approach.
关键词：通信；航天器通信；无线电通信；光学通信；并行工程
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3987.基于有限元模拟的低碳钢管的金刚石冲模优化
[黑色金属冶炼和压延加工业] [2014-03-31]
Diamond-coated drawing dies are considered as ideal drawing dies for their unique characteristics, such as high hardness, wear resistance and low friction. In order to utilize the superior characteristics of diamond coatings towards improving the drawing performance, the nonlinear FEM simulation is used to simulate the whole low carbon steel tube hollow sinking process, with 2D axi-symmetric elastic-plastic element. Based on the simulation results, the distributions of the axial stress and radial stress are analyzed, the influence of parameters of drawing dies on the diameter shrinkage is investigated. Optimal die parameters are obtained.
关键词：钢铁；金刚石冲模；有限元模拟
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3988.连接操作和战略通信架构：集成小型无人机系统作为机载战术中继通信垂直节点
[计算机、通信和其他电子设备制造业,信息传输、软件和信息技术服务业] [2014-03-31]
Through the efforts of this thesis, the goal is to extend and enhance beyond line of sight (BLOS) and on-the-move communications at the small unit level. The findings provide face validation that Small-UAS equipped with a communication payload can provide these services that enhance voice transmissions, and thus, enable TCP/IP data transfer in communication degraded environments without interfering with the Small-UAS primary ISR function or airworthiness. Future efforts in this line of inquiry may also inform the use of multiple Small-UAS to extend the network and autonomous operations, and perhaps, eliminate the requirement for a ground Small-UAS operator.
关键词：通信；通信网络；无线电中继系统；数据传输系统；小型无人机系统
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3989.电信科学研究所FY2011技术进展报告
[信息传输、软件和信息技术服务业,计算机、通信和其他电子设备制造业] [2014-03-31]
ITS performs basic research in radio science that provides the technical foundation for NTIAs policy development and spectrum management activities. ITS research enhances scientific knowledge and understanding in cutting-edge areas of telecommunications technology.Through leadership roles in various working groups, ITS helps to influence development of international standards and policies to support the full and fair competitiveness of the U.S. communications and information technology sectors. ITS research helps to drive innovation and contribute to the development of communications and broadband policies that enable a robust telecommunication infrastructure, ensure system integrity, support e-commerce, and protect an open global Internet.
关键词：通信；通信卫星；通信网络；系统分析；无线电通信；技术评估
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3990.淬火中任何配置钢件核心的显微组织和硬度的预测
[黑色金属冶炼和压延加工业] [2014-03-31]
In this paper we discuss the standard Jominy curve method, which is used for hardness and microstructure prediction at the core of steel parts of different shapes. It is shown that the simplified method of calculation needs verification by an exact analytical solution of the problem connected with the Jominy end-quench method. For this purpose, an exact analytical method of calculations is proposed. It is established that the cooling rate at the core of steel parts can differ by up to 12as compared with the self-regulated boiling process and extremely forced convection.
关键词：钢铁；显微组织；硬度；顶端淬火曲线；冷却速率
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