This is the final report of the COMNAVMETOCCOM Independent Model Review Panel (CIMREP) for the Voice of America Coverage Analysis Program (VOACAP), version 05.0119W, as modified by the Space and Naval Warfare Systems Center Pacific (SSC-Pacific), Atmospheric Propagation Branch (5528). VOACAP is a tool for predicting the performance of High Frequency (HF) radio communication systems. The authors evaluated VOACAP for possible inclusion in the Oceanography and Atmospheric Master Library (OAML) by (1) using provided and online documentation from HF experts, (2) installing the program on PCs, (3) running a series of test cases and (4) comparing the output results with other HF models and VOACAP versions.

关键词：通信和广播系统；电磁辐射；大气物理学；语音通信

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This study arose from the importance of having soldiers reliably connected to one another and to their chains of command, or 'networked,' despite the possibility of disruptions and/or degraded system performance. The objective was to identify possible new communications and information capabilities that ensure sufficient connectivity and performance to be able to successfully share information. Satellite communications and GPS today are force multipliers, providing forces with extensive connectivity and enabling control over battlefields. These communications and information capabilities can reduce uncertainty and suppress threats, but they must be implemented in ways that prevent adversaries from finding ways to deny, disrupt, and degrade them. Lessons from recent asymmetric confrontations (e.g., NATO operations in Syria, Egypt, and Libya) include the following: the deployment of standard military communication systems may not be sufficient to ensure adequate connectivity and information-related capabilities, the adversary can destroy networks without disrupting his own vital networks or exercising global control over public networks, and populations can respond to simple inputs using social networks. The solution posed by adversaries with these capabilities is to extend and integrate traditional C2 systems with a social network infrastructure concept, a C2 system applet applied to COTS devices, and a supporting concept like crowdsourcing in a protected environment. The resulting C2 system will be better able to operate successfully in a degraded operational environment where a simple SMS can make the difference. This paper demonstrates the value of this new approach with a simulation.

关键词：指挥和控制系统；通信网络；信息交流；融合；移动计算

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关键词：车辆安全;通信系统;动态数据;智能系统

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The General Dynamics (GD) S-Band software defined radio (SDR) in the Space Communications and Navigation (SCAN) Testbed on the International Space Station (ISS) provides experimenters an opportunity to develop and demonstrate experimental waveforms .

关键词：算法；空间通信；超高频率；空间导航；通信；

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Engineering a city-wide ubiquitous computing system requires a comprehensive understanding of urban infrastructure including physical motorways, vehicular traffic, and human activities. Many world cities were built at different time periods and with different purposes that resulted in diversified structures and characteristics, which have to be carefully considered while designing ubiquitous computing facilities. In this paper, we propose a novel technique to study global urban infrastructure, with enabling city-wide ubiquitous computing as the aim, using a massive data-driven network of planet-scale online web-cameras and a location-based online social network service, Foursquare. Our approach examines six metropolitan regions infrastructure that includes more than 800 locations, 25 million vehicular mobility records, 220k routes, and two million Foursquare check-ins. We evaluate the spatio-temporal correlation in traffic patterns, examine the structure and connectivity in regions, and study the impact of human mobility on vehicular traffic to gain insight for enabling city-wide ubiquitous computing.

关键词：数据库管理；系统工程；计算机通讯；计算机模拟；通信和无线电系统

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Markov Random Fields (MRFs), a.k.a. Graphical Models, serve as popular models for networks in the social and biological sciences, as well as communications and signal processing. A central problem is one of structure learning or model selection: given sam

关键词：网络;算法;通信和广播系统;分布

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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：空间通信；地面支持系统；系统工程；系统兼容性

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Independent Component Analysis (ICA) has largely been applied to the biomedical field over the past two decades and only recently extended to the processing of complex non-circular sources. The feasibility and performance of complex ICA to extract a weak co-channel interfering communications signal from a television broadcast signal is investigated in this thesis. The performance of three algorithms, complex maximization of non-Gaussianity (CMN) by Novey et al., RobustICA by Zarzoso et al., and complex fixed-point algorithm (CFPA) by Douglas, over varied interference-to-noise ratios (INR) for a fixed signal-to- interference ratio (SIR) is obtained by simulation. The communication signals examined for the weak interferer are binary phase-shift keying (BPSK), four- level rectangular quadrature amplitude modulation (4-QAM), and 16-level rectangular quadrature amplitude modulation (16-QAM), and the television broadcast signals are North American standard, Advanced Television Systems Committee (ATSC) and European standard, Digital Video Broadcasting - Terrestrial (DVB-T). Improved performance and sensitivity to the prewhitening step present in the ICA implementations are shown as the number of sensors increases.

关键词：通信和系统;无线电信号;算法;数字录音系统;提取

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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：空间通信；通信卫星；无线电通信；试验台；无线电设备

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Today's nuclear power plant (NPP) instrumentation uses current loops and voltage-based communications sometimes compromised by radio frequency interference (RFI), also called electromagnetic interference (EMI). Copper-based communications technology also relies on insulation that may degrade after decades of exposure to NPP environments and can be flammable. Wireless technologies offer the potential for greater expansion in instrumentation in a plant that could augment human performance, provide additional data on plant equipment and component status, and facilitate online assessment of the material condition of plants. Wireless communications capabilities may substantially reduce the cabling cost, but a number of technology and security issues must be resolved. One of the greatest capital cost contribution from I&C systems arises from cable installation. The trend toward more effective, efficient operation and maintenance will require many additional sensors beyond the number of nuclear and process sensors at a conventional NPP. These additional sensors are needed to enable monitoring of real-time process variables, structural components, movable equipment, portable devices, and warehouse/inventory areas, but will exacerbate the cabling complexity and cost. Wireless technologies offer the potential for greater expansion in instrumentation in a plant that could augment human performance, provide additional data on plant equipment and component status, and facilitate online assessment of the material condition of plants.

关键词：电站;通信网络;传感器;费用;电力电缆

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