| A Very Compact, High Speed and Rugged Acousto-Optic Tunable Filter for Wavelength Division Demultiplexing in Fiber Optic Communication Networks. Phase 1 |
30 JUN 1995 |
26 pages |
| Authors:
Sean X. Wang; Vladimir Pelekhaty; Keith Li; Jack Crystal; BRIMROSE CORP OF AMERICA BALTIMORE MD
|
 | Novel concepts of near-collinear/collinear acousto-optic interactions have been investigated during this SBIR Phase I program. As a result, several new acousto-optic tunable filters have been built and tested. The program is highlighted by: (1) Design, fabrication and experimental demonstration of a novel TeO2 near-collinear acousto-optic tunable filter has been designed, fabricated and tested. The device exhibits a 1.29 nm spectral resolution and a 160 mw RF drive power at 1523 ... |
|
| Best Practices in Telephone Services |
JUN 95 |
23 pages |
| Authors:
Eva Adams; Jim Apistolas; Grant Clark; Chris Cupp; Frank Greer; DEFENSE TECHNICAL INFORMATION CENTER ALEXANDRIA VA
|
| As part of the Defense Technical Information Center's (DTlC) continuing efforts to increase the quality of service to our users, DTlC implemented a benchmarking project in August 1994. For the purpose of this report, benchmarking is defined as a structured process for evaluating the products, services, and work process of organizations that represent best practices for organizational improvement. The structure of benchmarking is provided by development of a step-by-step process ... |
|
| A Comparison of Two Alternative Velocity Vector Cue Combinations for the AH-64D Integrated Helmet and Display Sight Subsystem |
JUN 95 |
46 pages |
| Authors:
John E. Stewart Ii; ARMY RESEARCH INST FOR THE BEHAVIORAL AND SOCIAL SCIENCES ALEXANDRIA VA
|
| The AH-64A employs an integrated helmet and display sight subsystem which presents night vision system and flight data to the pilot's right eye. Velocity.vector and acceleration cues tell the pilot when the aircraft is accelerating, its speed, and vector. A 6 kt cue is used for hovering; a 60 kt cue for transition. A single 20 kt cue was proposed for the AH-64D. The requirement was dropped, but the question ... |
|
| Tracking Cellular Phones with UAV's |
JUN 95 |
139 pages |
| Authors:
Michael P. Fallon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The use of cellular phones has become widespread. It is predicted that cellular phone use will soon become almost as high as normal land-line telephones. The ability to track these phones has obvious advantages for intelligence gathering. The problem with tracking these phones is that their use is intermittent and they are very low power emitters. The use of Unmanned Aerial Vehicles (UAV's) could help in the detection of these ... |
|
| Helmet-Mounted Display Symbology and Stabilization Concepts |
JUN 95 |
114 pages |
| Authors:
Richard L. Newman; CREW SYSTEMS CONSULTANTS SAN MARCOS TX
|
| The helmet-mounted display (HMD) presents flight, sensor, and weapon information in the pilot's line of sight. The HMD was developed to allow the pilot to retain aircraft and weapon information and to view sensor images while looking off boresight. |
|
| Language Identification Through Parallel Phone Recognition |
19 MAY 95 |
|
| Authors:
C. S. Chou; M. A. Zissman; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
 | Language identification systems that employ acoustic likelihoods from language-dependent phoneme recognizers to perform language classification have been shown to yield high performance on clean speech. In this report, such a method was applied to language identification of telephone speech. Phoneme recognizers were developed for English, German, Japanese, Mandarin, and Spanish using hidden Markov models. Each of these processed the input speech and output a phoneme sequence in their respective languages ... |
|
| I/O Interface between VME Bus and Asynchronous Serial Data Computer. |
09 MAY 1995 |
|
| Authors:
Dale W. McKim; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A computer interface is provided to support communication between a VMEbus architecture and a computer having its input/output (I/O) interface based on MIL- STD 1397B Type D or E asynchronous serial data specifications. A dual port RAM provides temporary storage for VMEbus data being transferred to the computer and computer data being transferred to the VMEbus. Both the VMEbus data and computer data are stored in a VMEbus parallel format. ... |
|
| Safety Guidelines for the Design, Operation, Test and Maintenance of Communications-Electronics Systems Operated On-the-Move |
MAY 95 |
50 pages |
| Authors:
David Kiernan; ARMY COMMUNICATIONS-ELECTRONICS COMMAND FORT MONMOUTH NJ
|
| This Technical Report (TR) provides safety guidelines for the design, operation, test, and maintenance of Communications-Electronics Systems operated On-The-Move (OTM) in a tactical environment. The information in this report was extracted from military and commercial standards as well as from lessons learned experienced by CECOM Safety Office safety engineers. Specifically, design and operational recommendations are provided to minimize potential hazards that may occur during anticipated tactical situations that may be ... |
|
| Military-Media Relations: The Future Media Environment and its Influence on Military Operations |
APR 95 |
35 pages |
| Authors:
Douglas J. Goebel; AIR WAR COLL MAXWELL AFB AL
|
| This paper initially reviews the evolving relationship between the military and the media from the Vietnam War to the present. Following this analysis, the paper analyzes the future media environment and its impact on the theater commander and military operations. Many times there has been conflict between the two groups because of their differing missions. The media's goal is to keep the public informed in a timely manner and to ... |
|
| Wide Field of View Helmet Display Systems Mounted for Helicopter Simulation |
23 MAR 95 |
|
| Authors:
Lin Yi Zhong; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
|
| Telephone Line Selector and Call Accountant. |
21 MAR 1995 |
|
| Authors:
Daniel A. Berenato; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A telephone line selection and accounting system is provided. The system has an electronically programmable read only memory (EPROM) database of rate information for each carrier. Upon initiation of a user call, the database is first updated using automatic rate update tones (if available) from each carrier. The database rate information is then used to select the lowest cost carrier. The system provides the capability to connect to a carrier ... |
|
| Design and Integration Issues of Visually-Coupled Evaluation |
MAR 95 |
139 pages |
| Authors:
H. L. Task; Dean F. Kocian; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH CREW SYSTEMS DIRECTORATE
|
| This document is the text of a short course presented at SPIE ih 1992 and 1994 dealing with design and integration issues of visually-coupled systems (VCS). The VCS described are composed of a helmet-mounted display, a display image source, and a head helmet tracker. (AN) |
|
| Analysis of Heads-Up Display Quickening Versus Handling Qualities |
MAR 95 |
133 pages |
| Authors:
Gary M. Konnert; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This study investigated an analytical means of selecting the quickening time constant for the standardized Heads-Up Display flight path marker. The theoretically determined time constant allowed a faster, less resource intensive means of selecting the quickening time constant. The theoretically best time constant for pilot-aircraft handling qualities was equal to the airframe pitch attitude high frequency zero time constant, T-theta-2. Flight test indicated an empirical, more labor intensive method yielded ... |
|
| The DORIC Program: HF Modem Technology |
MAR 95 |
|
| Authors:
Martin C. Gill; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| This report describes the HF data modem work undertaken at DSTO as part of the DORIC program. |
|
| Government Emergency Telecommunications Service (GETS). Exercise Analysis Report, DEMO '94 |
28 FEB 95 |
48 pages |
| Authors:
SCIENCE APPLICATIONS INTERNATIONAL CORP MCLEAN VA
|
| The first integrated operational demonstration of the Government Emergency Telecommunications Service (GETS) Limited Capability (LC) features, dubbed Demo 94, was conducted on 25-27 October 1994 at the GTE Chantilly, Virginia, facility. The audience witnessed a live demonstration of GETS' ability to provide telecommunications support for National Security and Emergency Preparedness (NS/EP) user missions in a crisis environment. Demo '94 also showcased the integration of other National Communications System (NCS) initiatives ... |
|
| Mass Media. The Tenth Principle of War? |
13 FEB 95 |
20 pages |
| Authors:
Lisa Squire; NAVAL WAR COLL NEWPORT RI DEPT OF OPERATIONS
|
| Information has become a viable weapon of war that can be used to strategic, operational and tactical advantage by both enemy and friendly forces. Mass media is the agent by which military information is collected, interpreted and transmitted to worldwide audiences and therefore, has tremendous power to affect the outcome of military operations. The commander who embraces the inevitability of media presence in the theater of operations and plans accordingly, ... |
|
| Security and Facsimile |
FEB 95 |
57 pages |
| Authors:
Stephen Perschau; DELTA INFORMATION SYSTEMS INC HORSHAM PA
|
| In addition to the secure transmission of the facsimile data, a second area of concern is the authentication of the sender and receiver, i.e., the sender is the true originator of the document and the receiver is the intended recipient of the document. The prior year report addressed the use of cryptosystems, both single/secret key and public key, in providing the secure data transmission and also authentication protocols within Group ... |
|
| Requirements Validation for Telecommunications Services-Philadelphia Area |
06 JAN 1995 |
42 pages |
| Authors:
Thomas F. Gimble; John A. Gannon; Robert M. Murrell; Annie L. Sellers; Consolacion L. Loflin; INSPECTOR GENERAL DEPT OF DEFENSE ARLINGTON VA
|
| The objective of the audit was to evaluate the effectiveness of the revalidation of requirements for existing leased long-haul telecommunications services in the Philadelphia area. |
|
| Data Security Vulnerabilities of Facsimile Machines and Digital Copiers |
JAN 1995 |
40 pages |
| Authors:
William J. Orvis; Allan L. Van Lehn; LAWRENCE LIVERMORE NATIONAL LAB CA
|
| This study examines the data security vulnerabilities of facsimile machines, i.e., self-contained fax machines and fax modems. This study is primarily concerned with vulnerabilities associated with outsider intrusion and interception. An outsider is anyone who does not have physical access to the fax machine, but does have access to the phone number, wires, utilities, and trash that passes into and out of the facility containing the fax machine. This paper ... |
|
| TCP Performance over ACTS |
1995 |
14 pages |
| Authors:
C. E. Fair; NATIONAL CENTER FOR ATMOSPHERIC RESEARCH BOULDER CO
|
| Coupled atmospheric and hydrodynamic forecast models were executed on supercomputing resources of the National Center for Atmospheric Research (NCAR) in Boulder, Colorado and the Ohio Supercomputing Center (OSC) in Columbus, Ohio respectively. The interoperation of these two models on distributed, high performance computing platforms required the transfer of large three dimensional data sets at very high in formation rates. High capacity terrestrial fiber optic transmission system technologies ... |
|
| Gateway: Volume 6, Number 4 |
1995 |
17 pages |
| Authors:
Victor Klymenko; Clarence E. Rash; Jerry Wachtel; Michael C. Reynolds; CREW SYSTEM ERGONOMICS INFORMATION ANALYSIS CENTER WRIGHT- PATTERSON AFB OH
|
| This issue contains articles on the following subjects: (1) Human Performance with New Helmet-Mounted Display Designs; (2) Human Factors in Process Control: Developing Criteria for the Review of Advanced Human-System Interface Designs; 3. Federal Aviation Administration Technical Center: Human Factors Support. |
|
| Passive, Multi-Channel Fiber Optic Rotary Joint Assembly. |
06 DEC 1994 |
|
| Authors:
Gregory H. Ames; Roger L. Morency; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A passive multi-channel optical fiber rotary joint couples optical fiber communication channels via axially bilaterally symmetrically disposed lens housings, or array pieces, for receiving miniature-collimation-lenses to one and the other sides of an image-derotation-prism and prism-rotational-drive-subassembly including an image derotation prism which rotates at a predetermined ratio of the relative rotation of the array pieces. This establishes transverse pseudo-planar rotary interfaces respectively between the one and another array piece ... |
|
| Ride Motion Simulator (RMS) Testing Using Human Occupants (Submitted to Human Use Committee) |
DEC 94 |
16 pages |
| Authors:
AnnMarie Berger; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| The objective of this report is to summarize the results of using human occupants in the RMS during the Crewmans Associate Job. This report does not address the subjective data obtained on the helmet mounted displays and controllers preferobility and usability. This report will be submitted to the Human Use Committee and describes the tests conducted. |
|
| Ride Motion Simulator (RMS) Testing Using Human Occupants (Submitted to Human Use Committee) |
DEC 94 |
16 pages |
| Authors:
AnnMarie Berger; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| The objective of this report is to summarize the results of using human occupants in the RMS during the Crewmans Associate Job. This report does not address the subjective data obtained on the helmet mounted displays and controllers preferobility and usability. This report will be submitted to the Human Use Committee and describes the tests conducted. |
|
| T2L2 Time Transfer by Laser Link |
Dec-1994 |
12 pages |
| Authors:
Christian Veillet; Patricia Fridelance; OBSERVATOIRE DE LA COTE D'AZUR GRASSE (FRANCE)
|
| T2L2 (Time Transfer by Laser Link) is a new generation time transfer experiment based on the principles of LASSO (Laser Synchronization from Synchronous Orbit) and used with an operational procedure developed at OCA (Observatoire de la Cote d'Azur) during the active intercontinental phase of LASSO. The hardware improvements could lead to a precision better than 10 ps for time transfer (flying clock monitoring or ground based clock comparison). Such a ... |
|
| Telephone Monitoring and Recording. Change 1 |
16 NOV 94 |
2 pages |
| Authors:
WASHINGTON HEADQUARTERS SERVICES (DOD) DC
|
| The attached Change 1 to DoD Directive 4640.1, "Telephone Monitoring and Recording," January 15, 1980, is provided to DTlC. The DTIC accession number for the basic Directive is ADA-271072. |
|
| Partial Discharge Testing of High Voltage Wiring Harness for Airborne Displays |
OCT 94 |
18 pages |
| Authors:
Gregory L. Rhoads; John Horwath; Daniel Schweickart; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| The pilots of advanced tactical airplanes must evaluate increasingly more information. Innovations such as the heads-up" display were designed to decrease the visual workload. More flexible helmet- mounted CRTs are now being developed, presenting new design challenges. For example, high voltage leads for helmet-mounted displays must incorporate a quick release, load-break mechanism into the wiring harness to accommodate pilot ejection. The potential presence of flammable vapors resulted in an arc-suppressing, ... |
|
| Phase Conjugate Propagation Study |
OCT 94 |
59 pages |
| Authors:
G. J. Dunning; M. L. Minden; D. M. Pepper; C. Oh; K. T. Andrews; HUGHES AIRCRAFT CO MALIBU CA
|
| This study addresses two issues that relate to optical communication systems over a propagation path that includes an ensemble of randomly distributed dynamically moving scattering sites. One issue pertains to the reduction of off axis scattering experienced by a probe beam of light that propagates from a remote sensor to an interrogator over the path. A second issue involves the sensing and quantification of any global motion of the scattering ... |
|
| Efficient Symbol-Spreading Strategies for Wireless Communication |
OCT 1994 |
82 pages |
| Authors:
Gregory W. Wornell; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| Some efficient new classes of algorithms for compensating for fading in wireless systems are introduced. For single-user or frequency-division multiplexed wireless systems, we develop a technique we refer to as spread-response precoding which replaces the interleaver traditionally used in conjunction with coding in such systems. From the perspective of the coded symbol stream, spread-response precoding effectively transforms an arbitrary Rayleigh fading channel into a nonfading, simple white marginally Gaussian noise ... |
|
| Video Transmission for Quantized Variable Bandwidth Networks |
08 SEP 94 |
19 pages |
| Authors:
Christopher C. Yu; NAVAL RESEARCH LAB WASHINGTON DC
|
| Transmission of variable bit-rate sources, such as video, over channels with quantized rates is discussed. An optimal scheme for transmission, based on the Viterbi algorithm, is described. A sliding window sub-optimal algorithm is introduced which significantly reduces algorithmic complexity while maintaining near-optimum performance. Simulation of the performances of the optimal and sub-optimal algorithms, as well as comparisons to a constant bit rate channel is completed. Video compression, Asynchronous transfer mode ... |
|
| Secure Distributed Time for Secure Distributed Protocols |
SEP 94 |
|
| Authors:
Sean W. Smith; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE
|
| This thesis develops a framework for secure distributed time, and uses this framework to build secure protocols for practical problems. In distributed systems, many important problems-such as detecting potential causality, obtaining global states, and recovering from process failure-center on temporal relations more general than the linear order of real time. Systems with asynchronous message passing require a partial order time model, and systems with multiple levels of abstraction require multiple ... |
|
| The Use of Telemetry in Tactical Network Management |
SEP 94 |
60 pages |
| Authors:
Lucious B. Morton; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis addresses the issue of reporting the real-time status of equipment in a tactical telephone system. The U.S. Army is developing a system called the Integrated System Control to manage all tactical communication networks. However, this system does not provide the network managers with a rapid and efficient tool for identifying and diagnosing network outages based on equipment failure. The current semi-manual method of reporting system residuals and failures ... |
|
| Efficient Use of Telephone Survey Response Facilities: A Decision Aid |
SEP 94 |
107 pages |
| Authors:
Neale R. Ellis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis develops an object-oriented simulation model of the Computer Aided Telephone Inquiry (CATI) system currenily employed by the Defense Health Resources Study Center, which allows recipients of mailed survey questionnaires to respond to the mailed questionnaires via telephone. The simulation models system performance and the response arrival process as a transitory queuing system. The primary focus of this study is to develop a predictive decision aid for effective and ... |
|
| A Structured Approach To Information Technology Management In The Department Of Defense |
SEP 94 |
235 pages |
| Authors:
Paul R. Logan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Information technology management (ITM) in the Department of Defense (DoD) has changed significantly during the 1980's and early 1990's. The pace of this change seems only to be accelerating as computer processing power continues to increase, data storage and retrieval capacity continues to grow, telecommunications capabilities continue to improve, hardware and software become more readily available, and automation costs continue to decrease. Managers need to understand the answers to the ... |
|
| Visual Perception in the Field-of-View of Partial Binocular Overlap Helmet-Mounted Displays |
AUG 94 |
26 pages |
| Authors:
Victor Klymenko; Robert W. Verona; Howard H. Beasley; John S. Martin; William E. McLean; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
|
| Because of limitations in the size of the field-of-view (FOV) available in helmet-mounted displays (HMD) using the full overlap display mode, where the entire FOV is binocular, partial binocular overlaps displays, which can be convergent or divergent, have been proposed. One consequence of this is a perceptual effect known as luning, which is a subjective darkening in the monocular regions of the FOV, which can in some cases cause fragmentation ... |
|
| Acousto-Optic Beam Steering Study |
AUG 1994 |
|
| Authors:
H. W. Presley; L. M. Burberry; A. F. Abbenante; HARRIS CORP MELBOURNE FL GOVERNMENT AEROSPACE SYSTEMS DIV
|
| This is the final report for a 21 month study investigating the use of acoustic-optic beam steering for inter-satellite laser communications (lasercom). The basic technique is demonstrated in a breadboard that uses a customized 2-dimensional acoustic-optic Bragg cell deflector and a magnifying optical system comprised entirely of off-the-shelf components. The breadboard was designed to steer a laser over a range of 360 x 36 degrees. Important characteristics of the acoustic-optic ... |
|
| Processing Multilevel Secure Test and Evaluation Information |
31 JUL 94 |
11 pages |
| Authors:
George Hurlburt; Bradley Hildreth; Teresa Acevedo; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| The Test and Evaluation Community Network (TECNET) is building a Multilevel Secure (MLS) system. This system features simultaneous access to classified and unclassified information and easy access through widely available communications channels. It provides the necessary separation of classification levels, assured through the use of trusted system design techniques, security assessments and evaluations. This system enables cleared T&E users to view and manipulate classified and unclassified information resources either using ... |
|
| Resonant Tunneling Quantum Well Integrated Optical Waveguide MOdulator/ Switch |
JUL 94 |
33 pages |
| Authors:
Andrew Kostrzewski; PHYSICAL OPTICS CORP TORRANCE CA APPLIED TECHNOLOGY DIV
|
| In this Phase I program, Physical Optics Corporation (POC) has investigated resonant tunneling double barrier quantum wells (RTDBQW) for application to all-optical communication networks. The RTDBQW) can be used as a building block in superfast SONET/ATM network. The proposed concept relies on the integration of an optical guided wave modulator with the RTDBQW. Several waveguide modulator architectures have been investigated, including Mach-Zehnder directional couplers. A Mach-Zehnder interferometer has been selected ... |
|
| Adaptive Locally Optimum Processing for Interference Suppression from Communication and Undersea Surveillance Signals |
JUL 94 |
116 pages |
| Authors:
James W. Bond; Vincent Broman; David Stein; James Zeidler; Stefen Hui; NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
|
| The technical results contained in this report include: Formulas for optimum processing of complex samples when the sign als has known and unknown phase structure; Formulas for optimum processing of complex sample amplitude, phases, and symmetric phase-differences when the signal has known and unknown phase structure; Formulas for the optimum processing of the frequency domain representation of the signal samples when the signal is narrowband; explicit formulas for processing samples ... |
|
| Self-Initializing Circuit Link. |
21 JUN 1994 |
|
| Authors:
Anthony E. Spezio; Saurabh Dalal; Edward M. Alexander; Hal L. Levitt; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A circuit link, and method for using link, for self initializing any device operatively connected to the link. An input signal is split into two portions, one of which is delayed so that the undelayed signal can transverse the circuit link before the delayed signal. A pair of quadrature splitters are operatively connected to one another to split and combine the undelayed and delayed signals in their turns, and recombine ... |
|
| Mass Media and Clausewitz: A Different Look at the Trinity |
05 MAY 94 |
54 pages |
| Authors:
Thomas J. Burton; ARMY WAR COLL CARLISLE BARRACKS PA
|
| This monograph examines the controversy surrounding mass media and war by close examination of the media's influence on Carl von Clausewitz's 'Remarkable Trinity' (the people, the government, and the military). After a brief historical examination of that controversy, a new model is developed that provides a tool for the examination of past, present, and future conflicts. Subsequent sections examine the application of this model against limited war, total war, operations ... |
|
| Atomic Line Filter for SDI Applications |
13 APR 94 |
70 pages |
| Authors:
Jim Menders; S. H. Bloom; Eric Korevaar; M. Rivers; C. S. Liu; THERMOTREX CORP SAN DIEGO CA
|
| When optical signals are embedded in background noise, narrowband optical filters are needed for receivers to achieve quantum limited performance. Such is typically the case with daytime optical communications and lidar. Narrowband filtered detectors. with acceptance bands of just a few picometers (pm) and high out of band rejection are well suited for these applications. The main thrust of this program has been the development of two means for narrowband ... |
|
| Method and Apparatus for Polarization-Maintaining Fiber Optical Amplification with Orthogonal Polarization Output. |
12 APR 1994 |
|
| Authors:
Irl N. Duling III; Ronald D. Esman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A single-polarization fiber optical amplifier and corresponding method is provided capable of amplifying an optical input signal by a fiber optic amplifier constructed of fiber which may be non-polarization-maintaining. The single-polarization fiber optical amplifier provides a direction-selective coupler which receives an optical input at a first port and outputs an optical output at a second port. A fiber optic amplifier is operatively connected to the direction-selective coupler at a bidirectional ... |
|
| Multi-Channel, Covert, Non-Line-Of-Sight UV Communication. |
05 APR 1994 |
|
| Authors:
Myer Geller; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system enables omnidirectional non-line-of-sight simultaneous communications in a number of frequency separated channels in the ultraviolet spectrum. A plurality of discharge lamps each has at least a single different isotope of mercury for each omnidirectionally radiating a discrete line in the ultraviolet spectrum. Each of the discrete lines in the ultraviolet spectrum is modulated by an on-off sequence generator so that modulated discrete lines transmit communications to a number ... |
|
| ELF Communications System Ecological Monitoring Program: Electromagnetic Field Measurements and Engineering Support |
APR 94 |
375 pages |
| Authors:
D. P. Haradam; J. R. Gauger; J. E. Zapotosky; IIT RESEARCH INST CHICAGO IL
|
| The ELF Communications System enables the U.S. Navy to communicate with submarines worldwide at operational depth and speed. The system consists of transmitting facilities in Wisconsin and Michigan that synchronously broadcast messages. Transmitters became fully operational in Wisconsin in 1985 and in Michigan in 1989. In situ studies to monitor for possible bioelectromagnetic effects from operation of both transmitters were initiated in 1982. The studies use a split-plot or blocked ... |
|
| Silica Fresnel Lens for Laser Communications |
15 MAR 94 |
31 pages |
| Authors:
Bing F. Zhu; Jean-Luc Nogues; GELTECH INC ALACHUA FL
|
| This document presents the results of the study on the fabrication and characterization of pure silica Fresnel lenses by a replication process. To demonstrate the replication capability of diffractive or Fresnel optics, Fresnel lenses were prepared by a sol-gel molding technique. The optical quality and performance and dimensional characteristics of the lenses are reported. Optical and physical properties tested included glass homogeneity, UV/VIS/NIR transmission, light scattering and surface profilometry. Optical ... |
|
| Advanced Optical Fiber Communication Systems |
01 MAR 94 |
36 pages |
| Authors:
Leonid G. Kazovsky; STANFORD UNIV CA DEPT OF ELECTRICAL ENGINEERING
|
| Our research is focused on three major aspects of advanced optical fiber communication systems: dynamic wavelength division multiplexing (WDM) networks, fiber nonlinearities, and high dynamic range coherent analog optical links. In the area of WDM networks, we have designed and implemented two high- speed interface boards and measured their throughput and latency. Furthermore, we designed and constructed an experimental PSK/ASK transceiver that simultaneously transmits packet-switched ASK data and circuit-switched PSK ... |
|
| Elimination of Electromagnetic Interference to Receivers and Sensitive Equipment Generated by Switching Systems |
MAR 94 |
78 pages |
| Authors:
Emmanuel Stelioudakis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Recently installed equipment in naval receiving sites such as digital telephone switching systems, uninterruptible power supplies, laser printers etc. , induce Electromagnetic Interference (EMI) into receiver systems, thus limiting the performance of the receiving site. EMI is injected into receiver systems by conducted, inductive and capacitive paths associated with poor compartment shielding, grounds, or cable shielding. In this thesis, the MITEL SX-20 automatic digital telephone switching system is studied as ... |
|
| Mobile Subscriber Equipment: The Materiel Fielding of a Nondevelopmental System |
MAR 94 |
|
| Authors:
Stephanie G. Vandeveire; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Mobile Subscriber Equipment (MSE) is a tactical communications system which provides mobile field radio, telephone, and record traffic for the U.S. Army at corps and division levels. This system went from contract award to materiel fielding in a period of less than two and a half years through the utilization of nondevelopmental item (NDI) acquisition. The accelerated acquisition cycle presented many challenges to the successful deployment of this tactical communications ... |
|
| Theory and Application of Image Enhancement |
FEB 94 |
467 pages |
| Authors:
Michael G. Ellis Sr.; Roy L. Campbell Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS INFORMATION TECHNOLOG Y LAB
|
| The conventional methods for image enhancement cannot be satisfactorily applied to the restoration of many types of images. This report explores standard image enhancement algorithms with emphasis on possible extensions to allow for real-time applications. The artifacts introduced by compression algorithms can often be compensated for by proper restoration techniques. A desktop conferencing system is prototyped in this report as a test-bed application to evaluate both real-time compression and real-time ... |
|
Non-radio Communications
