This integrated network architecture is expected to provide SCaN customers with the capabilities to seamlessly use any of the available SCaN assets to support their missions to efficiently meet the collective needs of Agency missions. One potential optimal application of these assets, based on this envisioned architecture, is that of arraying across existing networks to significantly enhance data rates and/or link availabilities. As such, this document provides an analysis of the transmit and receive performance of a proposed SCaN inter-network antenna array. From the study, it is determined that a fully integrated internetwork array does not provide any significant advantage over an intra-network array, one in which the assets of an individual network are arrayed for enhanced performance. Therefore, it is the recommendation of this study that NASA proceed with an arraying concept, with a fundamental focus on a network-centric arraying.

关键词：通信；宇宙通信；天线阵；深空网；可靠性分析

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Bluetooth data collection devices are an innovative technique for measuring travel times and speeds on roadway segments. This project developed a system capable of recording Bluetooth MAC addresses with a timestamp and determining the space mean speed of vehicles between multiple nodes. Battery powered and solar powered nodes are developed for the project. Various deployments of the nodes are utilized to determine the ideal placements and distances. The nodes are utilized in determining capacity of work zones by using travel speeds and times as surrogate measures of congestion. Nodes are also used to detect incidents based on increased Bluetooth device hit counts. Recommendations for node spacing are made for rural and urban areas.

关键词：通信；蓝牙；农村公路；数据收集；无线通信

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This approach is encumbered by the use of a number of disparate hardware and software tools, spreadsheets and documents to grasp the concept of the network design and operation. In case of NASA's space communication networks, since the networks are geographically distributed, and so are its subject matter experts, the team is challenged to create a common language and tools to produce its products. Using Model Based Systems Engineering methods and tools allows for a unified representation of the system in a model that enables a highly related level of detail. In this paper, we identify the challenges the PSE team faced in its quest to unify complex legacy space communications networks and their operational processes. We describe the initial approaches undertaken and the evolution toward model based system engineering applied to produce Space Communication and Navigation (SCaN) PSE products. We will demonstrate the practice of Model Based System Engineering applied to integrating space communication networks and the summary of its results and impact. We will highlight the insights gained by applying the Model Based System Engineering and provide recommendations for its applications and improvements.

关键词：通信；太空通信；通信网络；系统工程；系统集成；网络分析

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In this paper, parasitic feedback, uneven illumination and the implications of receiver array geometries are considered and experimental hardware results for HILPB are presented. The TEM00 Gaussian energy profile of the laser beam presents a challenge to the effectiveness of the receiver to perform efficient photoelectric conversion, due to the resulting non-uniform illumination of the photovoltaic cell arrays. In this investigation, the geometry of the receiver is considered as a technique to tailor the receiver design to accommodate the Gaussian beam profile, and in doing so it is demonstrated that such a methodology is successful in generating bulk receiver output power levels reaching 25 W from 7.2 sq cm of photovoltaic cells. These results are scalable, and may be realized by implementing receiver arraying and utilizing higher power source lasers to achieve a 1.0 sq m receiver capable of generating over 30 kW of electrical power.

关键词：通信；通信网络；激光接收器

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We summarize three problems. In the first problem, we study the impact of communication constraints on delay-critical problems of distributed computation. We consider networks of agents, each having access to some partial information, which aim at computing some application-specific function of the global information. Computation has to be ompletely distributed, i.e., agents can rely on the local observations only, while iteratively processing the available information, and communicating through digital noisy channels. As large delays can be detrimental for the overall system performance, it is critical to design distributed algorithms which perform such computation in the quickest possible way. We present tight lower bounds on the computation delay that capture the connectivity of the network as well as the channel characteristics.

关键词：通信网络；分布式；算法

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Congestion and hazardous traffic situations for the drivers on the road can occur around work zones and snowplow operation during the winter season due to low visibility. An information warning system for such environments can improve traffic mobility and thereby driver safety. Intelligent transportation systems (ITS) and other related technologies are being aggressively pursued to devise such automated traffic-information systems. Dedicated short-range communication (DSRC) has been considered as a key enabling wireless communication technology to realize such automated traffic warning systems. DSRC-based traffic-information systems use vehicle-to-vehicle (V2V) and/or vehicle-to-infrastructure (V2I) communication using DSRC technology to acquire and disseminate travel safety information. To take advantage of the disseminated information messages, a vehicle needs to be equipped with DSRC technology.

关键词：通信；无线通信；信息系统；混合动力；短距离通信；可变信息标志

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This work proposes mitigating emissions vulnerability by utilizing a new method of optical communications at LOS visual ranges reminiscent of flag semaphore. Tactical QR code communications streaming digital data through optical signaling has the potential to provide tactical communications at a moderate range, allowing critical communications to be relayed to and from off-ship platforms. Additional technological advances can be used to overcome current range, security, reliability, and throughput barriers. This project demonstrates how a combination of essential technical capabilities can be used to establish a QR code communications system as a potentially useful approach for tactical operations.

关键词：通信；光通信；舰队；速记式加密

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运用价值网和利害相关者权益等相关理论，研究运营商通过精细化流量经营实现流量价值的提升的 策略，并以某运营商S公司为实证案例，通过对现网用户数据的挖掘分析，理清S公司流量经营规模、收入、成本、效率和场景等方面的问题，结合对行业内标杆企业流量经营管理、技术的研究，提出S运营商流量经营的具体实施措施。

关键词：流量经营；智能管道；聚合平台；价值提升

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NASA has developed an experimental flight payload (referred to as the Space Communication and Navigation (SCAN) Test Bed) to investigate software defined radio (SDR) communications, networking, and navigation technologies, operationally in the space environment. The payload consists of three software defined radios each compliant to NASAs Space Telecommunications Radio System Architecture, a common software interface description standard for software defined radios. The software defined radios are new technology developments underway by NASA and industry partners launched in 2012. The payload is externally mounted to the International Space Station truss to conduct experiments representative of future mission capability. Experiment operations include in-flight reconfiguration of the SDR waveform functions and payload networking software. The flight system will communicate with NASAs orbiting satellite relay network, the Tracking and Data Relay Satellite System at both S-band and Ka-band and to any Earth-based compatible S-band ground station. The system is available for experiments by industry, academia, and other government agencies to participate in the SDR technology assessments and standards advancements.

关键词：通信；太空通信；通信卫星；无线电设备；软件工程

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企业信息化的内涵是企业的信息化建设者利用互联网、物联网、云计算、传感技术等各种现代化的信息技术手段，向企业生产、营销、管理等各个环节渗透，影响并促使企业管理理念的创新，管理流程的优化，管理团队的重组、营销理念的创新、运作模式和组织结构的变化，促进企业生产、营销、管理决策过程的自动化、准确化，使企业的内部资源易于共享、外部资源易于获取，对内外部各种资源进行广泛利用，不断提高企业生产、经营、管理、决策的效率和水平，进而提高企业经济效率，最终获得竞争优势的过程。

关键词：信息化；内部管理

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