Service Oriented Architecture (SOA) can enable agile C2 functionality. The flexibility and loose coupling offered by the SOA paradigm means that both NATO and many of the NATO nations are basing their future information infrastructures on this paradigm. Web services, the most common and mature technology for implementing a service-oriented system, will inevitably be a part of this development, at least for use in fixed infrastructure networks. SOA, realized using Web services technology, is currently available at the higher levels of command such as (deployed) headquarters, but not necessarily at tactical levels. However, SOA is a proposed paradigm for delivering C2 at the tactical level. IST-118 is a recently started research group intended as a follow-on to IST-090. IST-090 identified several challenges related to applying SOA at the tactical level, in particular, disadvantaged grids. In this paper, we summarize the important findings of IST-090, and outline the program of work for the IST-118 group in which the goal is to create a recommendation for a tactical profile for using SOA in disadvantaged grids.

关键词：通信；指挥与控制系统；通信网络；协同工作；软件工程

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In todays airports, IT is a core component of all systems. Airports are offering more com-prehensive services to their tenants and customers in the normal course of doing business. Thisprimer was developed as a user-friendly management tool to help airport executives and ITprofessionals:Identify and communicate effectively regarding common IT issues.Articulate sound IT principles for implementing IT systems.Implement a standard IT system lifecycle process for their airport.Effectively describe the benefits and value of IT systems when formulating airport strategicgoals and making financial investment decisions.Understand the fundamental architecture concepts of IT systems.Ultimately, the information in the primer should facilitate understanding among airport executives and help them work together more effectively on IT projects, leading to better performanceand reliability of IT systems and fewer cost overruns and delays during system implementation.

关键词：通信；信息系统；信息技术；机场

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Software-defined radios (SDRs) provide researchers with a powerful and flexible wireless communications experimentation platform. GNU Radio is the most popular open-source software toolkit for deploying SDRs, and is frequently used with the Universal Software Radio Peripheral (USRP). After establishing a USRP testbed, the researcher will need to implement new signal processing algorithms or modify existing ones. This document describes this process, highlighting those details that have received minimal attention in the existing documentation.

关键词：通信；通信和无线电系统；软件工程；信号处理；无线通信

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Software-defined radios (SDRs) provide researchers with a powerful and flexible wireless communications experimentation platform. GNU Radio is the most popular open-source software toolkit for deploying SDRs, and is frequently used with the Universal Software Radio Peripheral (USRP). There is significant complexity involved in setting up GNU Radio with the USRP; therefore, in this report, we describe the key steps to take (and pitfalls to avoid) in order to successfully establish such an SDR testbed.

关键词：通信；通信和无线电系统；无线通信；软件工具；实验平台

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With the results of these simulations, two- and three-dimensional representations of the area without communication coverage and area with coverage were developed, showing the size and shape of the communication coverage gap projected in space. Also, the significance of this communication coverage gap is analyzed from the simulation data. To analyze the extent of this gap and other coverage limitations, simulations of the DSN architecture were performed. In addition to the physical properties of the DSN assets, the simulation incorporated communication forward link calculations and azimuth/elevation masks that constrain the effects of terrain for each DSN antenna. Analysis of the simulation data was performed to create coverage profiles with the receiver settings at a deep space altitudes ranging from 2 million to 10 million km and a spherical grid resolution of 0.25 degrees with respect to longitude and latitude. 

关键词：通信；通信网络；深空网络；模拟；无线电频率干扰

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Air traffic controllers are often required to simultaneously communicate with several aircraft over multiple radio frequencies. As a result, during peak loading, it is common for the controller to receive multiple concurrent communications, each from a different aircraft, making it difficult to discern audio messages received from multiple pilots simultaneously. To address this problem, a modified air traffic control (ATC) interface was prototyped with the goal of increasing controller-to-pilot communication efficiency. This prototype included supplementary text cueing which was provided by a hypothetical automated text to speech system in an on-screen text box for controller reference in the event of an obscured or indiscernible radio call. The prototype was then evaluated by a group of 35 participants, all with ATC experience including 12 students and 23 instructors at the Air Force controllers' school house Keesler AFB, MS. The text cueing improved controllers' comprehension of pilots' transmissions.

关键词：通信；空中交通控制器；无线电系统；原型设计；信号产生

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Purpose of the Space Network Ground Segment Sustainment (SGSS) is to implement a new modern ground segment that will enable the NASA Space Network (SN) to deliver high quality services to the SN community for the future The key SGSS Goals: (1) Re-engineer the SN ground segment (2) Enable cost efficiencies in the operability and maintainability of the broader SN.

关键词：通信；太空通信；地面支持系统；系统工程；系统兼容性

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The project focuses on various aspects of Electromagnetic Compatibility (EMC) and its significance to today's automotive signal/data communication systems that include navigation, communication, safety, information and entertainment. The requirements of various data transmission networks (interconnecting wiring and connection system) to provide interface to various systems will be discussed. The importance of EMC assurance to minimize the systems emissions and susceptibility to electromagnetic Interference (EMI) will be examined. The research focuses on the identification of critical parameters that affect the performance of the data transmission network, the development of test methodology and the analytical techniques to properly define its performance characteristics.

关键词：通信；汽车运输系统；信号传输；数据传输；电磁兼容性

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Power Line Communication (PLC) systems provide a bi-directional communication platform capable of delivering data for a variety of Smart Grid applications such as home energy management and intelligent meter reading and control. One benefit of applying power line communication on power grid is that it provides an infrastructure that is much more comprehensive and widespread than other wired/wireless alternatives. Power line cables are a shared medium, therefore multiple PLC devices operate on the same frequency over the same power line may interfere with each other, thus reducing the effectiveness of these devices. This publication introduces the coexistence mechanism for the IEEE and ITU-T BB-PLC standards, and provides implementation guidelines for PLC devices to be used for smart grid applications.

关键词：通信；通信网络；宽带；电力线；标准；指南

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We study the problem of assigning a group of mobile robots to an equal number of distinct static targets, seeking to minimize the total distance traveled by all robots until each target is occupied by a robot. In the first half of our paper, the robots assume limited communication and target-sensing range otherwise, the robots have no prior knowledge of target locations. Under these assumptions, we present a necessary and sufficient condition under which true distance optimality can be achieved. Moreover, we provide an explicit, non- asymptotic formula for computing the number of robots needed for achieving distance optimality in terms of the robots communication and target-sensing ranges with arbitrary guaranteed probabilities. We also show that the same bound is asymptotically tight. Because a large number of robots is required for guaranteeing distance optimality with high probability, in the second half of our study, we present suboptimal strategies when the number of robots cannot be freely chosen. Assuming that each robot is aware of all target locations, we first work under a hierarchical communication model such that at each hierarchy level, the workspace is partitioned into disjoint regions; robots can communicate with one another if and only if they belong to the same region. This communication model leads naturally to hierarchical strategies, which, under mild assumptions, yield constant approximations of true distance-optimal solutions. We then revisit the range-based communication model and show that combining hierarchical strategies with simple rendezvous-based strategies results in decentralized strategies which again achieve constant approximation ratios on distance optimality. Results from simulation show that the approximation ratio is as low as 1.4.

关键词：通信；无线通信；移动机器人；距离优化；机器人网络

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