This research has produced several important research contributions to the communications, signal processing and data fusion communities. It was shown that if the sensors know that their data is to be used to solve a specific target detection and estimation problem, they are able to determine what data is necessary to accurately solve these problems and which data which is already well described by previously observed data. Thus joint design can enable a new generation of technologies for solving important real-world problems related to large-scale networks of monitoring sensors spread over large regions.

关键词：通信；通信网络；雷达；传感器；信息优势；联合信号处理

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Warfighting based on Commander s Intent and Mission Tactics will remain the foundation of command and control, but the information structure that supports Marine Corps tactical units will continuously undergo changes based on developments in information technology. Mobile Ad Hoc Networking is one of the information technology developments that the Marine Corps is currently studying. Mobile Ad Hoc Network s (MANETs) are infrastructureless, highly mobile communications and their multi-hop routing capabilities have the potential to reliably and robustly extend existing networks to the tactical edge. There are many challenges to MANET implementation however, including management of the dynamic physical topology, and the efficient use of limited spectral and energy resources. One platform being tested by the Marine Corps utilizes a time-division multiple access (TDMA) scheme combined with Barrage Relaying to ensure robust communications. Other schemes for MANETs employ intelligent-routing protocols. This thesis examines those protocols and identifies the parameters needed to implement a tactical MANET routing scheme. The findings of this research advance understanding of MANETs and the elements necessary to enable their use in support of tactical communications; bringing the Marine Corps closer to its goal of lightweight and efficient tactical communications.

关键词：通信；MANETs；战略通信；路由

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This research develops collection and signal processing models to produce passive SAR ground images using OFDM communication networks. The OFDM- based WiMAX network is selected as a relevant example and is evaluated as a viable source for radar ground imaging. The monostatic and bistatic phase history models for OFDM are derived and validated with experimental single dimensional data. An airborne passive collection model is defined and signal processing approaches are proposed providing practical solutions to passive SAR imaging scenarios. Finally, experimental SAR images using general OFDM and WiMAX waveforms are shown to validate the overarching signal processing concept.

关键词：通信；通信网络；合成孔径雷达；无源雷达；雷达成像；OFDM

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对电信行业客户行为标签进行了研究，分析了当前数据及信息系统现状，并结合国内外数据经营基础，重点剖析了数据分散、数据安全性及对外经营模式缺失等问题，提出了数据运营系统的构建方案，以实现数据统一汇聚、统一管控，开拓了对外经营服务局面。同时，以CTNET用户鉴权计费和超人MR项目为研究案例，充分论证了建立数据运营系统的可行性，证实了对提升电信运营商数据价值的重要意义。

关键词：数据运营；数据安全；标签数据

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GAO has identified the protection of systems supporting the nation's critical infrastructure--which includes the communications sector--as a government-wide high-risk area. GAO was asked to (1) identify the roles of and actions taken by key federal entities to help protect communications networks from cyber-based threats, (2) assess what is known about the extent to which cyber incidents affecting the communications networks have been reported to the FCC and DHS, and (3) determine if Defense's pilot programs to promote cybersecurity in the defense industrial base can be used in the communications sector. To do this, GAO focused on core and access networks that support communication services, as well as critical components supporting the Internet. GAO analyzed federal agency policies, plans, and other documents; interviewed officials; and reviewed relevant reports.

关键词：通信；网络安全；计算机网络；公共安全；国家安全

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This report presents a method for running a dynamic legacy inlet simulation in concert with another dynamic simulation that uses a graphical interface. The legacy code, NASA's LArge Perturbation INlet (LAPIN) model, was coded using the FORTRAN 77 (The Portland Group, Lake Oswego, OR) programming language to run in a command shell similar to other applications that used the Microsoft Disk Operating System (MS-DOS) (Microsoft Corporation, Redmond, WA). Simulink (MathWorks, Natick, MA) is a dynamic simulation that runs on a modern graphical operating system. The product of this work has both simulations, LAPIN and Simulink, running synchronously on the same computer with periodic data exchanges. Implementing the method described in this paper avoided extensive changes to the legacy code and preserved its basic operating procedure. This paper presents a novel method that promotes inter-task data communication between the synchronously running processes.

关键词：通信；数据传输；并行处理；仿真模拟；遗留代码

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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) will provide experimenters an opportunity to develop and demonstrate experimental waveforms in space. The GD SDR platform and initial waveform were characterized on the ground before launch and the data will be compared to the data that will be collected during on-orbit operations. A desired function of the SDR is to estimate the received signal to noise ratio (SNR), which would enable experimenters to better determine on-orbit link conditions. The GD SDR does not have an SNR estimator, but it does have an analog and a digital automatic gain control (AGC). The AGCs can be used to estimate the SDR input power which can be converted into a SNR. Tests were conducted to characterize the AGC response to changes in SDR input power and temperature. This purpose of this paper is to describe the tests that were conducted, discuss the results showing how the AGCs relate to the SDR input power, and provide recommendations for AGC testing and characterization.

关键词：通信；自动增益控制；无线电通信；SDR；宇宙空间站；太空通信

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最近，国务院发布了《促进信息消费扩大内需的若干意见》。“信息消费”，这个我们每个人日常都越来越深地参与其中的事物，却又显得新鲜和陌生。信息消费消费的是什么？怎样消费？它的内涵是什么？它有什么样的规律和特点？这一系列的问题，都引起了全社会各方的关注和讨论。尤其是在我国经济发展面临调整和转型的关键时期，推动信息消费的对我国的政治、经济、民生、未来发展等的意义在哪里，更是各路研究机构和专家解读的对象。

关键词：信息消费；信息通信

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This presentation briefly discusses application of the Root Raised Cosine (RRC) pulse shaping in the space telecommunication. Use of the RRC filtering (i.e., pulse shaping) is adopted in commercial communications, such as cellular technology, and used extensively. However, its use in space communication is still relatively new. This will possibly change as the crowding of the frequency spectrum used in the space communication becomes a problem. The two conflicting requirements in telecommunication are the demand for high data rates per channel (or user) and need for more channels, i.e., more users.

关键词：通信；脉冲通信；宇宙通信；电信；根升余弦滤波器

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As part of the effort to integrate UAS in the National Airspace, NASA Glenn Research Center is currently involved with providing research into Communications systems and Communication system operations in order to assist with developing requirements for this implementation. In order to provide data and information regarding communication systems performance that will be necessary, NASA GRC is tasked with developing and executing plans for simulations of candidate future UAS command and control communications, in line with architectures and communications technologies being developed and/or proposed by NASA and relevant aviation organizations (in particular, RTCA SC-203). The simulations and related analyses will provide insight into the ability of proposed communications technologies and system architectures to enable safe operation of UAS, meeting UAS in the NAS project goals (including performance requirements, scalability, and interoperability), and ultimately leading to a determination of the ability of NextGen communication systems to accommodate UAS.

关键词：通信；无人驾驶飞机系统；航空通信；通信系统仿真；建模

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