| Development of Lateral-Directional Transfer Functions for Class IV aircraft with Level 1 Flying Qualities |
DEC 95 |
64 pages |
| Authors:
Julieta E. Booz; NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
|
 | This report describes the computer program that was developed to support the effort currently being conducted at C. S. Draper Laboratory, Inc. to develop a hybrid, learning augmented, lateral-directional flight control system. The output from the computer program is a set of transfer functions for trimmed flight conditions which can be used to describe representative F-18 time histories. The transfer functions meet the Level 1 Flying Qualities Requirements of MlL-F8785C ... |
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| Video-Rate Z Keying: A New Method for Merging Images |
DEC 95 |
|
| Authors:
Takeo Kanade; Kazuo Oda; Atsushi Yoshida; Masaya Tanaka; Hiroshi Kano; CARNEGIE-MELLON UNIV PITTSBURGH PA ROBOTICS INST
|
 | Video-rate z keying is a new image keying method for merging real and synthetic images in real time. In visual media communication and display, it is often necessary to merge video signals from a real camera and a synthetic video produced by computer graphics. A standard technique for such a purpose is chroma keying which is used, for example, in TV weather reports. Chroma keying, however, simply puts real world ... |
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| Display Factors Affecting The Visibility of Information on a Simulated Passive Sonar Display |
DEC 95 |
|
| Authors:
Sharon M. McFadden; Marc Zulauf; DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)
|
| With current sonar technology the operator must handle large quantities of data. The primary medium for displaying these data is the CRT. Because of the limited space available on the CRT, the operator must scan multiple pages of data rapidly if he or she is to monitor all of the information. Thus, signal visibility is critical. To ensure good visibility, it is necessary to understand the impact of display characteristics ... |
|
| Limit-Cycle Behavior in Free Electron Lasers |
DEC 95 |
86 pages |
| Authors:
Roger M. Mabe; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Many Free Electron Lasers (FEL) are driven by short electron pulses which create equally short optical pulses. At saturation, the strong optical fields present in the undulator result in the trapped particle instability which drives the carrier wave unstable and modulates the optical pulse. The trapped particle instability coupled with the short optical pulses can result in periodic oscillations of the pulse shape. This results in oscillations of the output ... |
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| Multilevel Data Association for the Vessel Traffic Services System and the Joint Maritime Command Information System |
DEC 95 |
130 pages |
| Authors:
Ian N. Glenn; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis develops an algorithm to fuse redundant observations due to multiple sensor coverage of a vessel. Fuzzy membership functions are used as a measure of correlation, and a fuzzy associative system determines which observations represent the same vessel. The result is a computationally efficient algorithm. The output of the system is a unique set of vessels identified by unique platform identifiers. Results of tests based on computer simulation of ... |
|
| Experimental Study of a CW Chemical Oxygen-Iodine Laser |
21 NOV 95 |
13 pages |
| Authors:
Fengting Sang; Chengzhou Gu; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| Through experimentation, a continuous wave oxygen-iodine chemical laser was achieved. When the amount of chlorine flow was 50mmol/s, the output power reached 1kW. In conjunction with this, measurements were made of beam divergence angles, investigating the relationships between beam divergence angles and power as well as cavity reflector curvature radii. ANNOTATION: Experimental Study of a CW Chemical Oxygen-Iodine Laser. Translation. |
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| Hardware Implementation of a Desktop Supercomputer for High Performance Image Processing. Time Multiplexed Color Image Processing Based on a VLSI cellular Neural Network with Cell-State Outputs |
15 NOV 95 |
46 pages |
| Authors:
Jose P. de Gyvez; TEXAS A AND M UNIV COLLEGE STATION DEPT OF ELECTRICAL ENGINEERING
|
| This report presents a Cellular Neural Network (CNN) VLSI implementation to be used in a time-multiplexing scheme for processing large and complex images. While efficient VLSI implementations have been reported, no research work has addressed the use of small CNN arrays for processing large complex images. Hence, the work hereby presented introduces a strategy to process large images using small CNN arrays. For practical size applications, due to hardware limitations, ... |
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| Numerical Electromagnetic Engineering Design System (NEEDS 3.1) Workstation Programmer's Manual |
NOV 95 |
209 pages |
| Authors:
J. C. Lam; J. W. Rockway; L. C. Russell; D. T. Wentworth; NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
|
| This manual is a programmer's guide to the Numerical Electromagnetic Engineering Design System (NEEDS) Version 3.1 software program. NEEDS was developed to assist users of the Numerical Electromagnetics Code - Method of Moment (NEC-MoM). NEC-MoM requires rigidly defined inputs and often generates massive quantities of output. NEEDS makes NEC-MoM less tedious and more error- free. NEEDS 3.1 is specifically designed for NEC-MoM Version 4 users. |
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| Research Needed for More Compact Intermittent Combustion Propulsion Systems for Army Combat Vehicles. Volume 1. Executive Summary and Main Body |
NOV 95 |
69 pages |
| Authors:
SOUTHWEST RESEARCH INST SAN ANTONIO TX BELVOIR FUELS AND LUBRICANTS RESEARCH FACILITY
|
| Because of the unique performance requirements of combat vehicles, it is not possible to achieve the required propulsion system power density by adaptation of commercial engines; the Army must ensure that the research and development required to achieve the needed propulsion system power density is accomplished. To assist TACOM in identifying the research and development needed in the next decade for intermittent combustion combat engines, a BRC was established. Assuming ... |
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| Architecture and Performance Analysis of DIRSMIN: A Fault-Tolerant Switch Using Dilated Reduced-Stage MIN |
NOV 95 |
30 pages |
| Authors:
Arun K. Somani; Tianming Zhang; INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA
|
| We develop and analyze a dilated high performance fault tolerant fast packet multistage interconnection network (MIN) in this paper. In this new design, the links at the input and the output stages of a dilated banyan based MIN are rearranged to create multiple routes for each source destination pair in the network after removing one stage in the network. These multiple paths are link and node disjoint. Fault tolerance at ... |
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| A Two-Dimensional Numerical Program Simulating the Effects of Free- Electron Laser Nonrotational Symmetry |
31 OCT 95 |
18 pages |
| Authors:
Sihai Qian; Yijin Shi; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| A nonrotational symmetry 2D FEL numerical simulation program was set up with electron wiggling motion direction extended infinitely. This program was used to calculate light field evolution under conditions of nonideal incidence. Results showed that both shifting the center of the electron beam and tilting the beam axis caused the exponential degradation of luminous power output and excitation of higher order transverse modes, as well as deviation of the light ... |
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| Arbitrary Waveform Generator. |
31 OCT 1995 |
|
| Authors:
Maurice J. Griffin; Glenn S. Sugawara; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| This report describes a system for storing an arbitrary waveform on non-volatile random access memory (NVRAM) device and generating an analog signal using the NVRAM device. A central processing unit is used to synthesize an arbitrary waveform and create a digital representation of the waveform and transfer the digital representation to a microprocessor which, in turn, writes the digital data into an NVRAM device which has been mapped into a ... |
|
| EOSAEL (Electro-Optical Systems Atmospheric Effects Library) For Windows (Trade Name) |
25 OCT 95 |
51 pages |
| Authors:
MISSION RESEARCH CORP NASHUA NH
|
| The Electro-Optical Systems Atmospheric Effects Library (EOSAEL) is a state of the art computer library which describes atmospheric propagation in several wavelength regimes for the battlefield environment. The EOSAEL modules provide transmittance and radiance calculations through gases, natural aerosols, battlefield aerosols, smoke, haze, fog, and clouds for bandpass and laser propagation. The library consists of twenty-four FORTRAN codes which act fairly independently. Since the library was developed over time by ... |
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| Turbulent Kinetic Energy Budgets from a Large-Eddy Simulation of Airflow Above and Within a Forest Canopy |
20 OCT 95 |
83 pages |
| Authors:
Michael J. Dwyer; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| Large eddy simulation output was used to study the terms of the resolved scale turbulent kinetic energy budget. The computation produces a three dimensional, time dependent simulation of the airflow above and within a plant canopy where the lowest third of the domain was occupied by a drag layer and heat sources that represented a forest. Shear and buoyant production of TKE computed from the simulated resolved scale flow fields ... |
|
| Oil/Coolant Separator. |
17 OCT 1995 |
|
| Authors:
Jack H. Fentz; DEPARTMENT OF THE NAVY WASHINGTON DC
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| A separator that separates a lubricating oil from a coolant both of which are used in a cutting or grinding machine is disclosed. The separator comprises input, intermediate and output chambers comprising divider panels having top and bottom portions. Every other panel has a passageway near its top region and the alternate panels, relative to the every other panels, have passageways located at their bottommost region. The lubricating oil finds ... |
|
| TM:YALO 1.94-Micron, Solid State Laser. |
17 OCT 1995 |
|
| Authors:
Leon Esterowtiz; Robert C. Stoneman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A thulium-doped solid state laser is provided capable of operation at a wavelength having a shallow absorption depth in tissue. The laser is comprised of a laser cavity defined by first and second reflecting surfaces opposing each other on an optical axis, a thulium-doped YALO crystal disposed in the cavity, and a pump source for pumping the crystal with a pump beam at a preselected wavelength to enable the crystal ... |
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| Recent Developments in Inductive Output Amplifiers |
12 OCT 95 |
28 pages |
| Authors:
M. A. Kodis; K. L. Jensen; E. G. Zaidman; B. Goplen; D. N. Smithe; NAVAL RESEARCH LAB WASHINGTON DC
|
| An inductive output amplifier is an RF device in which an emission- gated electron beam induces RF fields in an output circuit by means of displacement currents, not convection current. Emission-gated electron beams experience strong interactions when traversing a resonant or synchronous electromagnetic field, and this strong interaction is responsible for both the interesting nonlinear physics and the attractive efficiency and compactness of emission-gated amplifiers. Field emission cathodes, due to ... |
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| Signal Processor Having Multiple Paralleled Data Acquisition Channels and an Arbitration Unit for Extracting Formatted Data Therefrom for Transmission. |
10 OCT 1995 |
|
| Authors:
Victor A. Andersen; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system for acquiring data from a plurality of analog signal sources includes a multiple-channel asynchronously operating first-stage subsystem each channel of which outputs composite digital representations of the analog signal, which in turn are passed to a digital processor in which the data are used by a second-stage subsystem (40). The second-stage subsystem (40) has a plurality of signal processing units (48), each having an input coupled to a ... |
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| Experiment on a Free-Electron Laser with a Tapered Wiggler and Analysis of Results |
02 OCT 95 |
17 pages |
| Authors:
Zhao Donghuan; Wang Jian; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| Experiments on a Raman FEL with a tapered field have been done. A maximum radiation output of 31MW at 8 to 10.4mm has been obtained with an energy efficiency of 9.68%. The tapering technique is effective in increasing the efficiency in the Raman FEL for large current and low energy electron beam. ANNOTATION: Experiment on a Free-Electron Laser with a Tapered Wiggler and Analysis of Results. --Translation. |
|
| Modification of Canberra's Accuspec Radiation Data Collection Program to Produce Spreadsheet-Format Output Files |
OCT 95 |
25 pages |
| Authors:
D. R. Laws; P. Karnik; D. R. LaCaze; J. A. Novotny; NAVAL MEDICAL RESEARCH INST BETHESDA MD
|
| This manuscript describes a modification of Canberra's Accuspec radiation data acquisition program to produce a compact, ASCII-format, concatenated output file with real- time display of data to a remote video terminal. This modification was driven by the needs of an experiment requiring the collection of data from several channels of input over many cycles, followed by statistical analysis and graphical display. These requirements were satisfied entirely within the framework of ... |
|
| InP Solar Cell Development on Inexpensive Si Substrates. Phase 1 |
OCT 95 |
43 pages |
| Authors:
Steven J. Wojtczuk; SPIRE CORP BEDFORD MA
|
| Indium phosphide (InP) solar cells were made on silicon (Si) wafers to take advantage of both the radiation-hardness properties of the InP solar cell and the light weight and cost savings of Si wafers compared to either InP or germanium (Ge) wafers. Calculations are presented which show that in very high radiation environments (e.g. van Allen proton belts), these cells can provide over twice as much EOL power density than ... |
|
| Postdoctoral Fellowship Study of X-Ray Optical Mammograph |
OCT 95 |
16 pages |
| Authors:
Carolyn A. MacDonald; Carmen C. Abreu; STATE UNIV OF NEW YORK AT ALBANY
|
| A number of feasibility measurements of the x-ray imaging properties of a capillary prototype optic for digital mammography were performed. The capillary prototype optic had input and output diameters of 4.15 mm and 7.5 mm, respectively. A mammographic scanning system was constructed to allow imaging of a larger field for some of the measurements. The optic showed good primary transmission (46%) at mammography energies. Images of a lucite contrast detail ... |
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| Design of Phase Quantization Digital Radio Frequency Memories |
29 SEP 95 |
|
| Authors:
Zhou Goufu; Ji Guoliang; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| This paper discusses the designs of the resistor loop phase shifter, input encoder, and output decoder used in a phase quantization digital radio frequency memories (DRFM), and analyzes the relationship between instantaneous bandwidth and sampling frequency of the phase quantization DRFM. The results show that the instantaneous bandwidth of the phase quantization DRFM is equal to, in numeral. the sampling frequency, which is the same as the I, Q double ... |
|
| Experimental and Theoretical Research on Advanced Vacuum Electronic Microwave Devices |
29 SEP 95 |
121 pages |
| Authors:
W. W. Destler; MARYLAND UNIV COLLEGE PARK
|
| This report summarizes the work done on the task titled "Harmonic Gyrotron Oscillators and Amplifiers", Covering the period from September 30, 1994 to September 29,1995. During the past year we have completed the test experiment of phase locking a 35 GHz second harmonic gyrotron oscillator using a quasi-optical circulator to separate injection and output signal. The experiment well demonstrated the capabilities of the hot test equipment in the harmonic gyrotron ... |
|
| Melatonin, the Pineal Gland and Circadian Rhythms |
25 SEP 95 |
5 pages |
| Authors:
Vincent M. Cassone; TEXAS A AND M UNIV COLLEGE STATION
|
| The rat pineal is a component of the circadian clock. Exogenous melatonin entrains the rat clock and does not require the presence of the pineal gland. The pineal gland is important for circadian rhythmicity. Pinealectomy exacerbates the disruptive effects of LL on rhythmicity. This may be due to a role of the pineal gland and melatonin in clock light sensitivity, since pinealectomized rats' ... |
|
| Quasi-Optical Constrained Lens Amplifiers |
20 SEP 95 |
222 pages |
| Authors:
Jon S. Schoenberg; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| A major goal in the field of quasi-optics is to increase the power available from solid state sources by combining the power of individual devices in free space, as demonstrated with grid oscillators and grid amplifiers. Grid amplifiers and most amplifier arrays require a plane wave feed, provided by a far field source or at the beam waist of a dielectric lens pair. These feed approaches add considerable loss and ... |
|
| The PASPlus Survey Graphics Package -- Applications and Design Elements |
19 SEP 95 |
19 pages |
| Authors:
John R. Palys; Dennis E. Delorey; BOSTON COLL CHESTNUT HILL MA INST FOR SCIENTIFIC RESEARCH
|
| This report describes the PASPlus Survey Graphics Package, which displays data from the full complement of instrumentation comprising the PASPlus payload, along with ephemeris and spacecraft state-of-health information. Graph types include instantaneous I-V curves for all sixteen of the research solar arrays, along with derived and ancillary information; biased-array current-loss data, as a time series; all parameters from the data-rich Transient Pulse Monitor, from which can be derived arcing rates ... |
|
| Smart Cards in Hostile Environments |
14 SEP 95 |
7 pages |
| Authors:
Howard Gobioff; Sean Smith; J. D. Tygar; CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE
|
| One often hears the claim that smart cards are the solution to a number of security problems, including those arising in point-of-sale systems. This paper argues that many proposed smart card systems still lack effective security for point-of-sale applications. We consider the point-of-sale terminal as a potentially hostile environment to the smart card. Moreover, we discuss several types of modifications that can be made to smart cards to improve their ... |
|
| Unmanned Aerial Vehicles: A Study of Gas Turbine Application |
SEP 95 |
88 pages |
| Authors:
David P. Lobik; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A survey of commercially-available gas turbine, spark and compression ignition engines was conducted to evaluate their current and future relative suitability for the DoD's unmanned aerial vehicle (UAV) short and close range program. The effects on performance associated with reducing gas turbine engine size from full scale to UAV dimensions were examined. A small turbo-jet engine (produced in France for remotely piloted vehicles) was procured in order to evaluate what ... |
|
| User's Guide for Computer Program TEMPER (X83O5) |
SEP 95 |
51 pages |
| Authors:
Terry West; FEDERAL ENERGY REGULATORY COMMISSION ATLANTA GA
|
| This manual documents the computer program TEMPER (x83O5) which estimates, using classical heat flow methods, the uniform and linear temperature distributions in arch dams. The program uses the theoretical methods described in "Control of Cracking in Mass Concrete Structures" by the U.S. Department of the Interior, Bureau of Reclamation. |
|
| Developing an Integrated Model for Measuring Organizational Effectiveness in Light of the Government Performance and Results Acts of 1993 |
SEP 95 |
70 pages |
| Authors:
Thomas A. Miller; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The purpose of this thesis was to review current Systems Program Office (SPO) effectiveness measures in light of the recently implemented Government Performance and Results Act of 1993 (GPRA), and to develop an integrated model of organizational effectiveness SPOs can use to comply with GPRA. Specifically, this thesis attempted to answer three research propositions addressing whether or not: (1) Current effectiveness measures used within SPOs are strictly output goal measures; ... |
|
| Distributed System Design Using Generalized Rate Monotonic Theory |
SEP 95 |
|
| Authors:
Lui Sha; Shirish S. Sathaye; CARNEGIE-MELLON UNIV PITTSBURGH PA SOFTWARE ENGINEERING INST
|
| Rate monotonic theory and its generalizations have been adopted by national high technology projects such as the space station and have recently been supported by major open standards such as the IEEE Futurebus(+) and POSIX. 4. In this paper, we describe the use of generalized rate monotonic scheduling theory for the design and analysis of a distributed real-time system. We review the theory, examine the architectural requirements for the use ... |
|
| Developing Integrated Decision Support Systems from Mathematical Models |
SEP 95 |
85 pages |
| Authors:
Michael S. Downs; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A methodology for the creation of decision support systems (DSS) from mathematical programming models is examined. This approach is demonstrated using a model for flight scheduling, integrating a formal data model, represented in a database management system (Paradox), and a mathematical programming model, represented in an executable mathematical modeling language (GAMS). The integration is completed by creating a database capable of supporting the GAMS model creating a series of queries ... |
|
| Optimal Inputs for System Identification |
SEP 95 |
196 pages |
| Authors:
James M. Brown II; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The derivation of the power spectral density of the optimal input for system identification is addressed in this research. Optimality is defined in information theoretic terms, with entropy quantifying the parameter information content of the input and output measurement sequences pertaining to a discrete time plant. The maximization of entropy is performed in the context of three different scenarios. First, the case in which the average output power of the ... |
|
| Hoo Optimization with Spatial Constraints |
SEP 1995 |
19 pages |
| Authors:
Raffaello D'Andrea; CALIFORNIA INST OF TECH PASADENA CONTROL AND DYNAMICAL SYSTEMS
|
| A generalized H infinity synthesis problem where non-euclidian spatial norms on the disturbances and output error are used is posed and solved. The solution takes the form of a linear matrix inequality. Some problems which fall into this class are presented. In particular, solutions are presented to two problems: a variant of H infinity synthesis where norm constraints on each component of the disturbance can be imposed, and synthesis for ... |
|
| Influence of Geometric Approximations on Computational Results in Complex Tunnel Configurations |
SEP 95 |
57 pages |
| Authors:
Robert G. Ekler; Lynn W. Kennedy; Charles E. Needham; S-CUBED ALBUQUERQUE NM
|
| This report describes a series of calculations undertaken to compare the effects of geometric approximations/simplifications commonly made when setting up hydrodynamic code simulations of blast and flow in tunnel systems. The approximations are made to save computer resources by running the calculation in two, rather than three, dimensions. A two-dimensional calculation requires less computational time by a factor of one to two orders of magnitude. It also requires less memory ... |
|
| Correlation and Kalman Filter Tracking Solutions for the NRL NIPEX algorithm |
SEP 95 |
74 pages |
| Authors:
Lee K. Allred; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis presents an algorithm designed to correlate and track airborne targets using positional and identification data reported from the Naval Research Laboratory Integrated Proforma Exploitation (NIPEX) test bed. The algorithm processes bearing and range inputs using an Interacting Multiple Model Kalman Filter (IMMKF). Association and gating of input measurements is accomplished with; (1) logical functions using amplifying information from MPEX output data, (2) linear velocity checks on all associations, ... |
|
| Discrete-Time Analysis of an ATM Multiplexer |
SEP 95 |
33 pages |
| Authors:
A. Shum; NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
|
| This report proposes a discrete time model of an Asynchronous Transfer Mode (ATM) statistical multiplexer subject to heterogeneous groups of ON-OFF traffic sources with correlated burst periods. NRaD researchers developed algorithms to compute both the exact transient and steady state cell loss probabilities of the multiplexers. The results yielded by the algorithms have been compared to simulation outputs and they showed perfect agreement (within noise level). The algorithms will be ... |
|
| Nonlinear Neural Network Oscillator. |
29 AUG 1995 |
|
| Authors:
Roger L. Woodall; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A nonlinear oscillator (10) includes a neural network (12) having at least one output (12a) for outputting a one dimensional vector. The neural network includes a plurality of layers, including an input layer, an output layer, and at least one hidden layer. Each of the layers includes at least one processing element (PE) that is interconnected to processing elements of adjacent layers. The input layer has an input coupled to ... |
|
| Diffusible and Driving Signals of Htebiological Clock |
27 AUG 95 |
8 pages |
| Authors:
Rae Silver; BARNARD COLL NEW YORK
|
| While it is well established that the SCN is the site of an endogenous circadian pacemaker that drives many behavioral and physiological rhythms, the output or coupling mechanisms(s) for signaling the brain and the rest of the body is not known. We used an encapsulation technique to physically isolate the grafted neurons from the host brain. Because the donor period (about 24 hours) is easily distinguishable from the freerunning period ... |
|
| Evaluation of Performance of DF Chemical Laser With Nitrogen Diluent |
21 AUG 95 |
14 pages |
| Authors:
Yao Cuiyue; Sun Chaojun; Guo Jianzeng; Li Huiying; Jin Hui; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| This article explores avenues for the practical applications of DF chemical lasers, conducts an analysis and study of experimental output capabilities, and compares these results with ordinary nitrogen diluent DF laser capabilities. The results illustrate that for the output capabilities of the device itself, the nitrogen diluent is somewhat inferior to helium diluent. However, considering overall capabilities, nitrogen diluent DF chemical lasers continue to be one of the ideal candidates ... |
|
| Control System for Tracking Nonlinear Systems. |
15 AUG 1995 |
|
| Authors:
Ira B. Schwartz; Ioana Triandaf; Thomas L. Carroll; Louis M. Pecora; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A control system for tracking the operation of a nonlinear system has two parts: a tracking subsystem and a controlling subsystem. The tracking subsystem generates a parametric signal and the controlling subsystem controls and stabilizes the nonlinear system operating under operating conditions corresponding to that parametric signal. The controlling subsystem includes a modulator responsive to the parametric signal and to a feedback signal for producing and applying an input signal ... |
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| Technique for Processing Interference-Contaminated Radar Energy. |
15 AUG 1995 |
|
| Authors:
Bernard L. Lewis; Frank F. Kretschmer Jr; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A technique for improving sidelobe canceller performance by blocking the canceller output signal upon sensing reduced main channel interference accompanied by an increased sidelobe canceller output. Two signal processing networks form the difference between successive output signals from a radar antenna and sidelobe canceller respectively. The difference signals are multiplied together and the product used to control passage and preclude utilization of the canceller output signal when reduced jamming interference ... |
|
| Computer Assisted Laser Range Finding and Detection Systems |
01 AUG 95 |
13 pages |
| Authors:
NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| Up to the present time, the majority of laser radars which have been reported were very expensive, had large volumes, and were very complicated in terms of utilization and maintenance. As far as this type of low cost laser range finding and detection system reported in this paper is concerned, use is made of a type of semiconductor laser diode emission device and a small model ... |
|
| Electronic Phase-Tracking Open-Loop Fiber Optic Gyroscope. |
01 AUG 1995 |
|
| Authors:
Alan D. Kersey; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A simplified signal processing technique for the open-loop fiber optic gyroscope is described which is based on the electronic closed-loop phase-shift nulling' concept. The system provides a linear output from an open-loop gyroscope configuration over a i2 pi radian range in Sagnac phase shift with good linearity and relatively low noise and drift. An alternative embodiment is disclosed utilizing, for example, a Mach-Zehnder interferometer for mixing the signals. |
|
| LCTA Users Interface Program Users Manual: Version 1.0 |
AUG 95 |
156 pages |
| Authors:
Alan B. Anderson; William Sprouse; Patrick Guertin; David Kowalski; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
|
| The Land Condition-Trend Analysis (LCTA) users interface program assists natural resources managers at U.S. military installations to manage and summarize LCTA inventory and monitoring data. The LCTA users interface program provides mechanisms to view and summarize vegetation, wildlife, soils, and land use data. This manual contains instructions for installing the software, viewing data, and summarizing data. Comprehensive descriptions for each data analysis summary include required input data, Output data and ... |
|
| Vibration Diagnostics for the Ml Abrams Tank Gas Turbine Engine |
AUG 95 |
29 pages |
| Authors:
Thomas A. Korjack; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A variety of analytical and experimental techniques have been explored to determine the efficacy and viability of application for diagnostics of an Ml tank gas turbine engine. Engine performance criteria along with mechanical maintenance programs have been identified to be used in the turbine engine diagnostics program. Spectrum analysis was chosen as the governing tool in determining engine functionabilities. A proof-in-principle test was performed via spectrum output that clearly illustrated ... |
|
| Evaluation of Gain Quenching Vertical Cavity Lasers with In-Plane Lasers for Smart Pixel Switching |
AUG 95 |
31 pages |
| Authors:
D. B. Shire; C. L. Tang; CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING
|
| A detailed study of monolithically integrated, intracavity coupled in plane and vertical cavity surface emitting lasers (VCSELs) for smart pixel switching is performed. It is shown that the extent to which the VCSEL section output is quenched depends on the overlap of the two lasers' gain regions, and on the in plane laser bias current. Complete quenching of the VCSEL output to a small spontaneous emission level is demonstrated under ... |
|
| HIVEL2D User's Manual |
AUG 95 |
41 pages |
| Authors:
R. C. Berger; Richard L. Stockstill; Mikel W. Ott; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| HWEL2D is a free-surface, depth-averaged, two-dimensional model designed specifically for flow fields that contain supercritical and subcritical regimes as well as the transitions between the regimes. The model provides numerically stable solutions of advection-dominated flow fields containing shocks such as oblique standing waves and hydraulic jumps. HWEL2D has been verified by comparing computed model results with laboratory data. The findings of these tests are presented in Stockstill and Berger (1994). ... |
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| Meteor-Burst Modeling and Analysis Final Report. R&D Equipment Information Computer Software Production Item Scientific and Technical Report |
30 JUL 95 |
137 pages |
| Authors:
Robert I. Desourdis Jr.; Anne K. McDonough; SCIENCE APPLICATIONS INTERNATIONAL CORP MARLBOROUGH MA COMMUNICATIONS ENGINEE RING LAB
|
| This report describes a computer model for predicting the performance of meteor burst communication links in terms of the usable meteor rate (MR) and the available channel duty cycle (DC). This model incorporates an empirical database of sporadic meteor flux, an empirical meteor velocity distribution, and detailed antenna pattern data usually provided by the National Electromagnetics Code (NEC). This program, PC METEORLINK, integrates MR and DC contributions throughout the sky ... |
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