| Tactical Digital Information Link-Technical Advice and Lexicon for Enabling Simulation (TADIL-TALES) II: Link 11/11B |
JUN 2006 |
|
| Authors:
Joe Sorroche; Rob Byers; Neil Barrett; ASRC COMMUNICATION LTD KIRTLAND AFB NM DISTRIBUTED MISSION OPERATIONS CENTER
|
 | Link 11/11B, otherwise known as TADIL A and TADIL B, has been used by U.S. Services and NATO nations for many years. However, the NATO Standard Agreement (STANAG) 5602 Standard Interface for Multiple Platform Link Evaluation (SIMPLE) does not fully describe the radio frequency network environment, which is required to model a more robust Link 11/11B operation. In addition, the IEEE 1278.1a standard does not provide a way to model ... |
|
| Med-E-Tel |
APR 2006 |
511 pages |
| Authors:
Frank Lievens; Malina Jordanova; LUXEXPO KIRCHBERG (LUXEMBOURG)
|
 | Med-e-Tel, is an international conference and exhibition, taking place annually in Luxembourg and organized by Luxexpo. Med-e-Tel 2006 was held on April 5-7, 2006 and attracted 400 participants from 48 countries. Participants included hospital administrators and department heads, association executives, industry (health, IT, telecom) representatives, academia, researchers, local and international government representatives, health insurers, homecare services. The Med-e-Tel 2006 conference program covered over 130 presentations on topics such as homecare ... |
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| Controlling Unmanned Aerial Vehicles During Crisis Response |
APR 2006 |
19 pages |
| Authors:
Ricky E. Sward; Stephen Cooper; AIR FORCE ACADEMY COLORADO SPRINGS CO INST FOR INFORMATION TECHNOLOGY APPLICATIONS
|
| The purpose of this project was to continue our research on Unmanned Aerial Vehicles (UAVs) and their usefulness during a response to a crisis situation. In previous work we have shown that both the video feed and the location of the UAV can be displayed in a command center to increase the situational awareness of commanders. The research presented here will build on our previous work and improve the situational ... |
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| Notes on the SHUMA Protocol. Scalable Access to Link-16 Time Slots |
30 MAR 2006 |
45 pages |
| Authors:
John Custy; Allen Shum; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
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| This document describes the mechanisms by which SHUMA provides adaptive, scalable access to Link-16 time slots while simplifying network design. Analysis and simulation results illustrate the relative merits of SHUMA versus conventional protocols. |
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| Evaluation and Analysis of Node Localization Power Cost in Ad-hoc Wireless Sensor Networks with Mobility |
MAR 2006 |
119 pages |
| Authors:
Brian A. Sessler; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| One of the key concerns with location-aware Ad-hoc Wireless Sensor Networks (AWSNs) is how sensor nodes determine their position. The inherent power limitations of an AWSN along with the requirement for long network lifetimes makes achieving fast and power-efficient localization vital. This research examines the cost (in terms of power) of network irregularities on communications and localization in an AWSN. The number of data bits transmitted and received are significantly ... |
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| Performance Analysis of a Cooperative Search Algorithm for Multiple Unmanned Aerial Vehicles under Limited Communication Conditions |
MAR 2006 |
138 pages |
| Authors:
Kevin M. Morris; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research investigates the impacts of realistic wireless communications upon a group of unmanned aerial vehicles (UAVs) utilizing a distributed search algorithm. The UAVs are used to survey an area for mobile targets and they require communication to cooperatively locate the targets. The mobile targets do not continually radiate energy, which exacerbates the search effort; a UAV could fly directly over a target and not detect it. A simulation of ... |
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| Exploiting Semi-Directional Transceivers for Localization in Communication Systems |
MAR 2006 |
68 pages |
| Authors:
Andrew S. Crockford; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Localization is the process of determining relative, as well as absolute, positions of communicating devices. Traditionally, the process is conducted using range or directional estimates. In contrast, this research uses weak information to form relatively tight bounds on possible locations of communicating devices. Under certain conditions, achieved location estimation results are strong. However, these results are highly sensitive to the operating conditions of the proposed networks. More significant results were ... |
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| A High-Speed High-Frequency Broadband Acoustic Modem for Short-to-Medium Range Data Transmission in Ports, Very Shallow Waters and Deep Waters Using Spread-Spectrum Modulation and Decision Feedback Equalizing |
06 FEB 2006 |
|
| Authors:
Pierre-Philippe Beaujean; John Spruance; Dion Kriel; FLORIDA ATLANTIC UNIV BOCA RATON
|
| Testing of a high-resolution decision feedback equalizing with parallel tracking of large Doppler algorithm developed at FAU by Prof. Beaujean: The long-term objective is the commercialization of a high-speed high-frequency acoustic modem transmitting data at true rates of up to 105,000 bps, at a maximum range of 500 m and operate between 240 kHz and 380 kHz. Acoustic communications were achieved at a coded rate up to 150,000 bps at ... |
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| The Effects of Pushing the Digital Divide to the Fighting Hole |
03-Feb-2006 |
14 pages |
| Authors:
J M Hamilton; MARINE CORPS COMMAND AND STAFF COLL QUANTICO VA
|
| As society moves from the industrial age to the information age, the importance of sharing accurate and timely information throughout the asymmetric battlespace is becoming increasingly apparent. The current lessons learned from Afghanistan and Iraq have shown that, oftentimes, it is the Platoon Leader, and not the Battalion Commander, who needs the digital communication feed from the Unmanned Aerial Vehicle (UAV) so that a critical tactical decision can be made. ... |
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| Synchronization and Detection of Binary Data in Free-Space Optical Communication Systems using Haar Wavelet Transformation |
JAN 2006 |
14 pages |
| Authors:
Nader Namazi; Jr Burris Harris R.; Charles Conner; G. C. Gilbreath; CATHOLIC UNIV OF AMERICA WASHINGTON DC DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| A new method is presented to perform bit synchronization and detection of binary nonreturn-to-zero (NRZ) data from a free-space optical (FSO) communication link. Based on the wavelet transformation, a new bandpass filter is developed and implemented. It is shown that the Haar wavelet is an excellent choice for this purpose. The center frequency of this filter is a function of the scale and could be adjusted to adapt to the ... |
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| Support Platform and Communications to Manage Cooperative AUV Operations |
2006 |
9 pages |
| Authors:
T. R. Cuff; R. W. Wall; IDAHO UNIV MOSCOW
|
| For the testing of control and communications algorithms in cooperative behavior, a fleet of autonomous underwater vehicles (AUVs) is under development by the University of Idaho. This paper discusses one piece of the puzzle in this fleet: the communications module to manage multiple agents. The communications system provides multiple modes of operation. Different communications mediums to and from the vehicle support these modes of operation. The tools supplied by the ... |
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| Packet Testing in Free-Space Optical Communication Links Over Water |
2006 |
11 pages |
| Authors:
M. R. Suite; H. R. Burris; C. I. Moore; M. F. Stell; L. Wasiczko; W. Freeman; W. S. Rabinovich; G. C. Gilbreath; W. J. Scharpf; NAVAL RESEARCH LAB WASHINGTON DC ADVANCED SYSTEMS TECHNOLOGY BRANCH
|
| NRL's Chesapeake Bay lasercom test facility (LCTF) offers a variety of ranges for researching free-space optical laser communication (FSO lasercom) links in a maritime environment. This paper discusses link performance over the 16 km one-way range at the LCTF. There are several methods to determine the link quality in FSO lasercom. Bit-error-rate (BER) testing and packet testing are two possible methods. Since errors generally tend to occur in bursts in ... |
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| Characterization of the Marine Atmosphere for Free-Space Optical Communication |
2006 |
13 pages |
| Authors:
Linda M. Wasiczko; Christopher I. Moore; Harris R. Burris; Michele Suite; Mena Stell; James Murphy; G. C. Gilbreath; William Rabinovich; William Scharpf; NAVAL RESEARCH LAB WASHINGTON DC
|
| The Chesapeake Bay Detachment of the Naval Research Laboratory (NRL-CBD) provides an ideal environment for characterizing the effects of the marine atmosphere on free space optical communication links. The site has recently been converted to an operational 10 mile (16.2 km) one-way test range to collect information on propagation statistics in a variety of atmospheric conditions. The results presented here compare the contributions of thermal gradients across the bay to ... |
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| UMass at TREC 2006: Enterprise Track |
2006 |
5 pages |
| Authors:
Desislava Petkova; W. B. Croft; MASSACHUSETTS UNIV AMHERST DEPT OF COMPUTER SCIENCE
|
| This paper gives an overview of the work done at the University of Massachusetts, Amherst for the TREC 2006 Enterprise track. For the discussion search task, we compare two methods for incorporating thread evidence into the language models of email messages. For the expert finding task, we create implicit expert representations as mixtures of language models from associated documents. |
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| Are You Managing Your Email - Or is Email Managing You? An Analysis of Email Among Personnel Within Army Project Management Offices |
DEC 2005 |
133 pages |
| Authors:
Brian Baroni; Linda Cook; Marian Keitelman; Steven Miller; Adelia Wardle; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Based on a class project that developed leadership communication competencies for seven levels of Army civilians, email was found to be the most prevalent means of communication, regardless of leadership level. Additionally, there was a widespread perception that email communication needs to be improved. This thesis seeks to explore the clarity, efficiency and effectiveness of email among personnel within Army project management offices. This study included four phases: 1) a ... |
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| On-demand Loop-Free Routing in Ad Hoc Networks Using Source Sequence Numbers |
NOV 2005 |
11 pages |
| Authors:
Hari Rangarajan; J. J. Garcia-Luna-Aceves; CALIFORNIA UNIV SANTA CRUZ DEPT OF COMPUTER ENGINEERING
|
| In any on-demand routing protocol, sources flood route requests (RREQ) to build routes to destinations, and each new RREQ is identified uniquely with a source-sequenced label (SSL) consisting of the source identifier and a locally generated sequence number. As a RREQ propagates, it creates a directed acyclic graph (DAG), because nodes relay each RREQ only once. We present the first framework for loop-free on-demand routing in ad hoc networks that ... |
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| Endpoint-Based Routing Strategies for Improving Internet Performance and Resilience |
29 SEP 2005 |
|
| Authors:
Aditya Akella; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE
|
| Internet access speeds of large enterprises and educational institutions have improved dramatically over the past few years. However, this higher-speed connectivity is still ineffective at providing end-users with good download performance and robustness from service interruptions. This arises due to the prevalence of constrained links with little spare capacity inside Internet Service Provider (ISP) networks. In this dissertation, we first investigate the location, latency and traffic load characteristics of network ... |
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| Network-Centric Operations Case Study: Air-to-Air Combat With and Without Link 16 |
28 SEP 2005 |
|
| Authors:
Daniel Gonzales; John Hollywood; Gina Kingston; David Signori; RAND NATIONAL DEFENSE RESEARCH INST SANTA MONICA CA
|
| In the mid-1990s, the U.S. Air Force at the request of Congress conducted the Joint Tactical Information Distribution System (JTIDS) Operational Special Project. In this exercise, the capabilities of F-15 air superiority aircraft equipped with voice-only communications were compared with F-15s equipped with voice and JTIDS Link 16 data link communications in tactical air-to-air combat. More than 12,000 sorties were flown in this special project. Blue offensive counterair packages composed ... |
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| Optical Dynamic Assignment for Low Earth Orbit Satellite Constellations |
14 SEP 2005 |
8 pages |
| Authors:
Alexander Melin; K. S. Erwin; VijaySekhar Chellaboina; TENNESSEE UNIV KNOXVILLE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| In this paper we investigate autonomous task assignment for a group or low-earth orbit satellites that don't necessarily have prior knowledge or the targets or interest. Specifically, we consider the optimal assignment problem for dynamic weighted bipartite graphs. First, we present necessary and sufficient conditions for the existence of a perfect matching in a given bipartite graph. Next, we present an algorithm to construct a virtual graph based on the ... |
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| Integrated Transceiver Chip Application in Free Space Optical Communication |
SEP 2005 |
35 pages |
| Authors:
James Chan; APIC CORP CULVER CITY CA
|
| The final report describes the design, fabrication, test methods, and performance analysis of a laser array. The developed multi-channel wavelength division multiplexing (WDM) laser array chip provides for hybrid-integration with an Arrayed Waveguide Grating (AWG) based multiplexer (Mux) to form a transceiver chip on silicon-on-insulator (SOI) or silica platform. The developed WDMA laser array chip will be able to support different data interfaces and protocols. In addition, this program further ... |
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| 802.16 OFDM Rapidly Deployed Network for Near-Real-Time Collaboration of Expert Services in Maritime Security Operations |
SEP 2005 |
87 pages |
| Authors:
Christopher E. Marvin; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The world's shipping lanes are an area of intense focus in the Global War on Terror. Every day millions of tons of cargo are shipped through thousands of ports. Most cargo is harmless, however, some ships carry the weapons and human operators of terrorist organizations. To prevent the spread of weapons and terror suspects on the sea lanes, the cargo, passengers, and crew of these vessels must be subject to ... |
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| Potentialities of HTS Superconductor Technology in Telecommunication Satellites |
13 JUL 2005 |
12 pages |
| Authors:
M. Maignan; B. Brevart; T. Trollier; V. Madrangeas; C. Zanchi; ALCATEL SPACE TOULOUSE (FRANCE)
|
| High temperature super-conductive (HTS) technology is presented as a disruptive technology able to improve the performances of microwave equipment: mass and volume savings, electrical properties, etc. To verify the well-founded of these qualities for telecom satellite payloads, the research department of Alcatel Space has studied two proof-of-concept of microwave space equipment including super-conductive and chill electronics. The objectives of these projects are to estimate the potential of HTS technology, evaluate ... |
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| High-Throughput Optical Interconnect Technology for Future On-Board Digital Processors |
13 JUL 2005 |
9 pages |
| Authors:
Michel Sotom; Norbert Venet; Pierre Aubry; Jacques Berthon; ALCATEL SPACE TOULOUSE (FRANCE)
|
| Digital processing is expected to take place in many satellite payload sub-systems, including advanced telecom repeaters and antenna beam-formers, next-generation radars and data handling units of remote sensors. The capabilities of integrated circuits and processors have been growing so rapidly over the last decades that the pressure is being now shifted to the interconnect function. Whereas the speed and pin count of IC's increases rapidly, the bandwidth and density of ... |
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| Conclusions of ESA 1st Optical Wireless Onboard Communications Workshop: Current Status and the Road Forward |
13 JUL 2005 |
6 pages |
| Authors:
Inmaculada Hernandez; Patrick Plancke; EUROPEAN SPACE RESEARCH AND TECHNOLOGY CENTRE NOORDWIJK (NETHERLANDS)
|
| The purpose of this workshop was to bring together representatives of European space agencies, aerospace industry, wireless technology industry, academia, research institutions, and end-users to do the following: (1) Review the state-of-the-art of optical free space communications in ground and in space, in short- and medium-link distances, point-to-point, as well as broadcast or other networking schemes; (2) Explore the future needs, potential solutions, and challenges in applying these technologies to ... |
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| Data Communications Over Aircraft Power Lines |
JUN 2005 |
12 pages |
| Authors:
Hal Tian; Tom Trojak; Charles Jones; AIR FORCE FLIGHT TEST CENTER EDWARDS AFB CA
|
| This paper introduces a study of the feasibility and initial hardware design for transmitting data over aircraft power lines. The intent of this design is to significantly reduce the wiring in the aircraft instrumentation system. The potential usages of this technology include Common Airborne Instrumentation System (CAIS) or clock distribution. Aircraft power lines channel characteristics are presented and Orthogonal Frequency Division Multiplexing (OFDM) is introduced as an attractive modulation scheme ... |
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| Modeling and Simulation of the Physical Layer of the Single Channel Ground and Airborne Radio System (SINCGARS) |
JUN 2005 |
75 pages |
| Authors:
Richard A. Paradise; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In this thesis, the physical layer of the Single Channel Ground and Airborne Radio System (SINCGARS) was analyzed to gain insight into the bit- error-rate (BER) performance in various channel conditions. The BER performance of the radio was examined using theoretical, simulation, and experimental techniques. These results are presented in graphical form as the probability of bit error as a function of the energy-per-bit to noise-power-spectral-density ratio. The results of ... |
|
| Network-Centric Railroading Utilizing Intelligent Railroad Systems |
JUN 2005 |
22 pages |
| Authors:
Steven R. Ditmeyer; INDUSTRIAL COLL OF THE ARMED FORCES WASHINGTON DC
|
| Network-centric railroading and intelligent railroad systems represent a" unified theory of railroading" in which positioning systems, sensors, computers, advanced mathematical methods, and digital communications are used to collect, process, and disseminate information to improve the safety, security, and operational effectiveness of railroads. Intelligent Transportation Systems (ITS) for highways and mass transit are based on the same technologies, as are the National Airspace System and maritime vessel tracking systems. Major parcel ... |
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| Automatic Generation of Social Network Data from Electronic-Mail Communications |
JUN 2005 |
43 pages |
| Authors:
Jason Yee; Robert F. Mills; Gilbert L. Peterson; Summer E. Bartczak; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Most organizations have formal and informal elements. Formal structures are usually documented in organizational charts showing chain of command, levels of authority, and personnel resources. The actual effectiveness of the organization or specific individuals may actually depend on informal structures and internal communication networks. These are by definition personality-dependent and may provide significant insight into how work actually gets done within the organization. Effective leaders will want insight into these ... |
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| Operation of Multiple Link 16 Terminals Connected to a Single Host |
JUN 2005 |
10 pages |
| Authors:
Kenneth D. Bradley; THALES-RAYTHEON SYSTEMS CO LLC FULLERTON CA
|
| Link 16 is the backbone tactical datalink system for exchange of related surveillance, weapons coordination, and air control information. The standard for Link 16 operation is a single terminal. Until recently no platform employed more than one Link 16 terminal. The United States (US) military standard and North Atlantic Treaty Organization (NATO) standard organizations have not developed documentation for operating multiple terminals from a single command and control (C2) unit. ... |
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| An Evaluation of the Success of the Tactical Electronic Medical Record: Graduate Management Project |
20 APR 2005 |
71 pages |
| Authors:
Scott J. Stokoe; MADIGAN ARMY MEDICAL CENTER TACOMA WA
|
| The purpose of this study was to evaluate the success of the tactical electronic medical record (Tactical EMR) and its ability to improve medical documentation. The study evaluated data collected from medical personnel using the Tactical EMR. The dependent variable used to evaluate success was organization impact and the independent variables were system quality, information quality, usage, user satisfaction, individual impact, unit, rank, duty position, and time with the unit. ... |
|
| Internet-Based Cervical Cytology Screening Program |
APR 2005 |
53 pages |
| Authors:
David C. Wilbur; MASSACHUSETTS GENERAL HOSPITAL BOSTON
|
| Cervical cancer is theoretically completely preventable by effective screening using cervical cytology methods (the Pap test). The process of preparing and interpreting Pap tests remains one of the last high-volume manual processes in the clinical laboratory. Recent technological advances in specimen preparation and computerized primary screening make automated approaches to cervical cancer screening possible. In addition, advances in information technology have facilitated the Internet transmission and archival storage of digital ... |
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| Integrating Software Architecture Evaluation in a DoD System Acquisition |
APR 2005 |
|
| Authors:
John Bergey; Timothy Morrow; CARNEGIE-MELLON UNIV PITTSBURGH PA SOFTWARE ENGINEERING INST
|
| These briefing charts demonstrate the integration of software architecture evaluation into a Department of Defense (DoD) system acquisition using the Common Link Integration Processing (CLIP) Program as an example. The presentation outline is as follows: CLIP Program Background, CLIP System and Software Concept, CLIP Challenges, Role of Architecture in RFP/contract, Current Acquisition Status, Proactive Application of Architecture Tradeoff and Analysis Method (Trademark) (ATAM (Trademark)) and Quality Attribute Workshop (Trademark) (QAW ... |
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| Wireless Radio Frequency Hydrophone System |
21 MAR 2005 |
13 pages |
| Authors:
James D. Hagerty; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A wireless hydrophone system includes a hydrophone joined to a preamplifier. A serial A/D converter receives the amplified hydrophone signal and provides a serial digital output representative of the signal. The A/D converter is joined to a processor which provides a start signal and a clock signal to the A/D converter. A digital transmitter is also controlled by the processor. The transmitter receives the serial digital output from the A/D ... |
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| Wireless Serial Data Transmission Method and Apparatus |
21 MAR 2005 |
19 pages |
| Authors:
James D. Hagerty; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A data transmission system includes a serial A/D converter and a transmission processor. Transmission processor provides control signals to the A/D converter and first and second transmitters. The first transmitter is joined to the A/D converter to transmit a sync signal at a first frequency. The second transmitter is joined to transmit serial digitized data at a second frequency. First and second receivers are used to receive these frequencies. A ... |
|
| Air Virtual At Sea Training (VAST) Platform Stimulation Analysis (CD-ROM) |
02 MAR 2005 |
1 pages |
| Authors:
David B. Cavitt; Rod Powers; BMH ASSOCIATES INC NORFOLK VA
|
| ELECTRONIC FILE CHARACTERISTICS: 3 files; MS PowerPoint (.PPT). PHYSICAL DESCRIPTION: 1 CD-ROM; 4 3/4 in.; 12.1 MB. SYSTEMS DETAIL NOTE: ABSTRACT: BMH Associates, Inc. and Cubic Applications, Inc. conducted research to determine the ease of which a platform's given weapons and avionic systems can be stimulated with entity state and event data generated by the developing Air VAST common synthetic battlespace. Task included the identification of candidate aircraft for ... |
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| Outcome Analysis Tool for Army Refractive Surgery Program |
MAR 2005 |
6 pages |
| Authors:
Kraig S. Bower; WALTER REED ARMY MEDICAL CENTER WASHINGTON DC
|
| The primary objective of this project has been to develop a web-based outcome analysis application to work with an existing electronic medical record database in the Army's Warfighter Refractive Eye Surgery Program (WRESP). The application, web-based Refractive Surgery Information System (webRSIS), is based on a precursor client/sever version previously developed and deployed. The availability of the outcomes information will ultimately improve the safety and efficacy of excimer laser keratorefractive surgery ... |
|
| Attitude Model of a Reaction Wheel/Fixed Thruster Based Satellite Using Telemetry Data |
MAR 2005 |
137 pages |
| Authors:
Jason E. Smith; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| Attitude determination of satellites is normally the job of inertial instruments, such as gyroscopes, or through sensing instruments, such as star trackers or Global Positioning Satellites (GPS). Satellite health monitoring systems watch and determine if the satellite deviates from its normal operating attitude orientation. Knowing the orientation of a satellite is essential in being able to control it in order to complete the satellite's designated mission. While there are a ... |
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| Issues Associated with the Global Information Grid Bandwidth Expansion |
28 FEB 2005 |
34 pages |
| Authors:
J. M. Gilmore; CONGRESSIONAL BUDGET OFFICE (U S CONGRESS) WASHINGTON DC
|
| The Department of Defense (DoD) is undertaking a major initiative to create a communications network called the Global Information Grid (GIG). The GIG is intended to be a single information-sharing network with multiple levels of security for use by DoD and possibly other elements of the national security community, including the intelligence agencies. It is intended to satisfy all operational and business needs for transmitting and sharing information among elements ... |
|
| Time Diversity Automatic Repeat Request (ARQ) Equalization Scheme |
19 JAN 2005 |
19 pages |
| Authors:
Fletcher A. Blackmon; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A method and system are provided for processing communication signals. In one embodiment, the method has the steps of providing a data signal based on a communication signal transmitted from a transmitting source, processing the data signal to determine if the data signal has acceptable error characteristics, requesting retransmission of the data signal if the data signal does not have acceptable error characteristics, coherently and jointly equalizing the data signal ... |
|
| Scaling in Computer Network Traffic |
07 JAN 2005 |
58 pages |
| Authors:
Darryl Veitch; MELBOURNE UNIV VICTORIA (AUSTRALIA)
|
| Presentation on efforts to measure and model computer/communications network traffic. |
|
| Completion and Field Demonstration of a Portable Coastal Observatory |
04 JAN 2005 |
|
| Authors:
Daniel E. Frye; Bradford Butman; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| The goal of the NOPP funded project, Low Cost Modular Telemetry for Coastal Time Series Data 1, was to develop an affordable, easy to use technology for the real time collection and dissemination of data from instruments deployed in the coastal ocean. The observing system that was developed consists of four elements: 1) low cost acoustic modems that are deployed with each instrument, 2) small, easy to deploy surface buoys ... |
|
| Physician Use of Hand-Held Computers for Drug Information and Prescribing |
2005 |
17 pages |
| Authors:
|
| The purpose of this study was to develop and pilot-test an instrument that determines the relationship between perceptions, intended use, and actual use of the personal digital assistant (PDA) by primary care physicians for drug information access and prescribing. The instrument studied addressed human factor limitations, attitudes toward learning to use the PDA, and fear of losing either confidential information or the PDA itself. The study instrument was intended to ... |
|
| Progress in Laser Propagation in a Maritime Environment at the Naval Research Laboratory |
2005 |
10 pages |
| Authors:
G. C. Gilbreath; W. S. Rabinovich; C. I. Moore; H. R. Burris; R. Mahon; K. J. Grant; P. G. Goetz; J. L. Murphy; M. R. Suite; M. F. Stell; M. L. Swingen; NAVAL RESEARCH LAB WASHINGTON DC
|
| In this paper, we summarize progress in free space laser propagation research at the U.S. Naval Research Laboratory, specifically in the context of propagating and detecting signals through the atmosphere in a maritime environment. Transmission through the atmosphere over large bodies of water presents different challenges that transmission through the atmosphere over land. Our paper reports some of these findings as well as progress in our collaborative efforts to mitigate ... |
|
| Steering Compensation for Strong Vertical Refraction Gradients in a Long-Distance Free-Space Optical Communication Link Over Water |
2005 |
11 pages |
| Authors:
M. R. Suite; C. I. Moore; H. R. Burris; L. Wasiczko; M. F. Stell; W. S. Rabinovich; W. J. Scharpf; G. C. Gilbreath; NAVAL RESEARCH LAB WASHINGTON DC ADVANCED SYSTEMS TECHNOLOGY BRANCH
|
|
| Optical Communication and Navigation for Spacecraft Docking using Modulating Retroreflectors |
2005 |
10 pages |
| Authors:
Linda M. Wasiczko; Harris R. Burris; N. G. Creamer; Rita Mahon; Christopher Moore; Lee Swingen; James Murphy; Mena Stell; Brad E. Pinney; Peter Goetz; NAVAL RESEARCH LAB WASHINGTON DC
|
| An optical communications link is used to transmit important navigation and range information between two spacecraft platforms to aid in the spacecraft docking process. This experiment uses NRL's multiple quantum well modulating retroreflector (MRR) array as the light payload optical communications transmitter on the target spacecraft. Spacecraft navigation information is determined by using the MRR array to impose five distinct modulation frequencies on the optical transmit beam, and analyzing the ... |
|
| FM-MRR Analog Audio System |
2005 |
9 pages |
| Authors:
J. L. Murphy; G. C. Gilbreath; W. S. Rabinovich; M. M. Sepantaie; P. G. Goetz; NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV
|
| In this work, we describe a hybrid free-space infrared communications link that supports audio transmission. The technique combines conventional frequency modulation "FM" techniques with optical amplitude modulation "AM" with a Multiple Quantum Well "MQW" Modulating Retroreflector "MRR" technology. The method has produced a robust, low power system capable of transmitting high quality audio information over a free space infrared link extending to multiple kilometers, depending on the characteristics of the ... |
|
| Quantum Key Distribution Using Polarized Single Infrared Photons |
01 DEC 2004 |
10 pages |
| Authors:
Roman Sobolewski; ROCHESTER UNIV NY DEPT OF ELECTRICAL ENGINEERING
|
| Experimental research has been conducted in order to establish the new quantum key distribution system for secure and undecipherable quantum communications. The system has been based on optical single-photon transmitters and superconducting single-photon detector receivers. The photon transmitters were based on heavily attenuated femtosecond optical pulses, generated by a high-repetition-rate laser. Novel superconducting devices were designed and developed for efficient and ultrafast counting of visible-light and near- infrared (telecommunication wavelength) ... |
|
| Ranger Medic Evaluation for Field Use of a Core Temperature Monitoring Unit |
DEC 2004 |
70 pages |
| Authors:
William J. Tharion; Reed W. Hoyt; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
|
| Management of heat injuries in military training and combat is a serious issue for military medical personnel. In addition to severe health consequences associated with heat stroke, it has been estimated that the cost of heat stroke injuries as a result of military training is approximately $10M/ year. The uses of new clinical tools to help diagnose and treat heat injuries are urgently needed. One device that may be useful ... |
|
| Distributed Beamforming in Wireless Sensor Networks |
DEC 2004 |
|
| Authors:
Chan C. Wai; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A wireless sensor network (WSN) consists of a large number of small sensor nodes that are densely deployed over an area to acquire information about targets of interest. These sensor nodes collaborate among themselves to form an ad-hoc network and disseminate the collected target information to an unmanned aerial vehicle (UAV). The objective is then to increase the data rate and transmission range between the sensor nodes and the UAV. ... |
|
| Simulations of Diversity Techniques for Urban UAV Data Links |
DEC 2004 |
115 pages |
| Authors:
Seng Cheong Telly Poh; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| In urbanized terrain, radiowave propagation is subjected to fading on large-scales and small-scales that would impede on the quality and reliability of data link transmission. This would have implications in many military applications. One example is the performance of unmanned aerial vehicle (UAV) data and communications links in complex urban environments. The purpose of this research is to study the effectiveness of diversity techniques on the performance of urban UAV ... |
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Telemetry
