| Multi-Input Multi-Output (MIMO) Radar - Diversity Means Superiority |
Oct-2009 |
7 pages |
| Authors:
Jian Li; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
 | A multiple-input multiple-output (MIMO) radar system, unlike a standard phased-array radar, can transmit via its antennas linearly independent waveforms. We have made significant contributions on exploiting the waveform diversity offered by MIMO radar to achieve superior performance. First, we have considered a MIMO radar system where both the transmitter and receiver have multiple well-separated subarrays with each subarray containing closely-spaced antennas. Because of this general antenna configuration, both the waveform ... |
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| Calibration of an Orthogonal Cluster of Magnetic Sensors |
Jul-2009 |
34 pages |
| Authors:
Andrew A Thompson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| This report interprets least-squares estimation as a magnetic sensor calibration procedure. The procedure demonstrated can be applied to any inner product type of sensor element to calibrate a single sensor or multisensor unit. The accuracy of the estimates can be quantified. In addition to scale factor and bias, the within-unit alignment and the alignment to a given coordinate system can be estimated. |
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| Tree-Structured Methods for Prediction and Data Visualization |
18-Mar-2009 |
20 pages |
| Authors:
Wei-Yin Loh; WISCONSIN UNIV-MADISON
|
| The aim of the research is to develop the GUIDE algorithm into a fast, powerful, and comprehensive procedure for tree-structured prediction and data visualization. During this reporting period, the regression component was enhanced by the addition of least squares regression through the origin, best simple analysis of covariance, all subsets regression, and least median of squares regression. An option to truncate the predicted values also was added. A preliminary classification ... |
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| Source Localization in Wireless Sensor Networks with Randomly Distributed Elements under Multipath Propagation Conditions |
Mar-2009 |
111 pages |
| Authors:
Georgios Tsivgoulis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis proposes a least-squares error estimator for line-of-sight, direction of arrival-based localization and a hybrid source localization scheme that addresses multipath propagation for non-cooperative sources using random arrays of wireless sensors. Taking advantage of the dominant reflections, the proposed solution finds the location of a signal source by triangulation using the direction of arrival estimations of both the line-of-sight and the reflected components. It uses a space division multiple ... |
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| Adaptive Filter Techniques for Optical Beam Jitter Control and Target Tracking |
Dec-2008 |
117 pages |
| Authors:
Michael J Beerer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The objective of this research is to develop advanced control methods to attenuate laser beam jitter using a fast-steering mirror. Adaptive filter controllers using Filtered-X Least Mean Square (FX-LMS) and Filtered-X Recursive Least Square (FX-RLS) algorithms are explored. The disturbances that cause beam jitter include mechanical vibrations on the optical platform (narrowband) and atmospheric turbulence (broadband). Both feedforward filters (with the use of auxiliary reference sensor(s)) and feedback filters (with ... |
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| Two-Way Satellite Time and Frequency Transfer (TWSTFT) Calibration Constancy From Closure Sums |
Dec-2008 |
19 pages |
| Authors:
Demetrios Matsakis; Andreas Bauch; Lee Breakiron; Dirk Piester; Zhiheng Jiang; NAVAL OBSERVATORY WASHINGTON DC
|
| Two-way Satellite Time and Frequency Transfer (TWSTFT) is considered to be the most accurate means of long-distance time transfer, on the basis of its reported 1 ns repeat calibration consistency. This paper uses the closure sum technique to show that variations of the link-based component of the transfer data, in the absence of configuration changes, are largely subnanosecond in the European links. Two explanations for small, but non-zero, biases observed ... |
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| Evaporation Rates of Chemical Warfare Agents Using 5-CM Wind Tunnels I. CASARM Sulfur Mustard (HD) from Glass |
Oct-2008 |
187 pages |
| Authors:
John Pence; Aaron Flowers; Chris V Giannaras; Erin Maloney; Joseph P Myers; Robert G Nickol; Kenneth B Sumpter; Carol A Brevett; H D Durst; Bruce E King; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
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| The evaporation of sulfur mustard (HD) from glass was studied as a function of temperature, drop size, and airflow rate. The evaporation rate was measured by collecting the HD vapor using thermal desorption tubes that were connected to the wind tunnel. The evaporation rate increased with higher temperature, drop size, and wind speed. Five different wind tunnels were used, and it was possible to fit all of the data generated ... |
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| Evaluation of Impact Mitigation and Health Monitoring Tradeoffs in Composite Missile Casing Design Using Iterative Inversion Loads and Damage Identification Methods |
26-Jul-2008 |
14 pages |
| Authors:
Douglas E Adams; Jonathan White; Nick Stites; Nathan Yoder; Carlos Escobar; PURDUE UNIV LAFAYETTE IN
|
| Sensing, modeling, and data analysis techniques for health monitoring of composite missile casings (carbon filament wound and S2 glass filament wound) have been developed. Here, the term health monitoring is used to refer to both loads identification and damage identification for the purpose of assessing the material state and structural performance of a missile casing pressure vessel. Impact loads were located and quantified using a single sensor without a detailed ... |
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| Investigation of the Acoustic Source Characteristics of High Energy Laser Pulses: Models and Experiment |
01-Jun-2008 |
87 pages |
| Authors:
Jason R McGhee; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis was motivated by the possibility of using high energy laser pulses as an acoustic source for naval applications. Research conducted in the 1970's and 80's shows that sound production from laser pulses is most efficient when the energy density of the pulse exceeds the threshold required for plasma formation. The resulting acoustic wave falls into the highly non-linear shock regime. Later work by Vogel et al. sought a ... |
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| Multivariate Analysis of the Effect of Source of Supply and Carrier on Processing and Shipping Times for Issue Priority Group One Requisitions |
01-Jun-2008 |
155 pages |
| Authors:
Gavan M Sagara; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This thesis investigates the effects of source of supply and carrier on the delivery times of high-priority requisitions to primary destinations of Navy, Military Sealift Command, USMC ground forces, and select U.S. Coast Guard units operating in the Fifth, Sixth, and Seventh Fleet Areas of Operation, and major Fleet concentration areas within the United States. The primary focus is on determining whether source of supply, carrier, and the interaction of ... |
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| Optical Phase Unwrapping in the Presence of Branch Points |
12-May-2008 |
15 pages |
| Authors:
Todd M Venema; Jason D Schmidt; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Strong turbulence causes phase discontinuities known as branch points in an optical field. These discontinuities complicate the phase unwrapping necessary to apply phase corrections onto a deformable mirror in an adaptive optics (AO) system. This paper proposes a non-optimal but effective and implementable phase unwrapping method for optical fields containing branch points. This method first applies a least-squares (LS) unwrapper to the field which isolates and unwraps the LS component ... |
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| Assessment of the Performance of the Near-Bottom Hydrophones of the U.S. Navy Southern California Offshore Range in Detecting, Localizing and Reconstructing 10-20 kHz Odontocete Whistles |
01-Mar-2008 |
81 pages |
| Authors:
Carl A Hager; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| A series of 10 to 20 kHz, frequency-sweeping signals synthesizing whistles of vocalizing Odontocetes was transmitted from a J-9 sound projector suspended from the Research Vessel Pt Sur while over the U.S. Navy Southern California Offshore Range (SCORE) Underwater Acoustic Range from 11 to 13 August 2004. The transmissions were recorded by a group of seven near-bottom hydrophones of the Range. Using statistical analysis on ensembles of the repeated transmissions, ... |
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| Determining the Capability Requirements for a Space-Based Optical Sensor to Determine the Trajectory of an Incoming Antisatellite Weapon |
01-Mar-2008 |
131 pages |
| Authors:
Mesut Guelmuesh; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The goal of this research is to build up a logic to catch and track the incoming ASAT weapons by using space-based onboard optical sensors. The satellite orbit and ASAT trajectory of the Chinese test were generated to relate the research to the real world application. These position and velocity values are used to generate simulated observation data for the imaginary sensor on the targeted satellite. These observation values are ... |
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| Space Based Satellite Tracking and Characterization Utilizing Non-Imaging Passive Sensors |
MAR 2008 |
112 pages |
| Authors:
Bradley R. Townsend; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| A technique is developed to determine the orbit of a sunlight illuminated satellite passing through the field-of-view of a sensor platform in a Highly Elliptical Orbit (HEO) and Geosynchronous orbit (GEO). The technique develops two different methods of initial orbit determination. The first relies on the Gauss initial orbit determination method to develop an estimate of the state from angular data. The second method relies on positional data of the ... |
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| Spectral Studies of Shallow Earthquakes and Explosions: Implications for P/S Energy Partitioning, Stress Drop, and Discrimination |
16-Jan-2008 |
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| Authors:
Peter Shearer; Bettina Allmann; CALIFORNIA UNIV SAN DIEGO LA JOLLA INST OF GEOPHYSICS AND PLANETARY PHYSICS
|
 | We compute and analyze P-wave spectra from 18,101 earthquakes and 1770 explosions recorded by 196 broadband seismic stations in southern California at epicentral distances up to 100 km. We use an online waveform database stored on a RAID system at Caltech, which provides complete access to the Southern California Seismic Network (SCSN) seismogram archive. We compute spectra using 1.28s noise and signal windows, positioned immediately before and after the P ... |
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| Radar Array Signal Processing in the Presence of Scattering Effects |
15 JAN 2008 |
12 pages |
| Authors:
Arye Nehorai; ILLINOIS UNIV AT CHICAGO CIRCLE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| We developed statistical time-reversal imaging and Cramer-Rao bounds (ORB's) for point targets and scatterers; realistic clutter modeling, random scattering reflections, compound Gaussian distributions, and signal dependence; maximum likelihood estimators, CRB's, and sequential target detectors in compoun%Gaussian clutter; polarimetric radar algorithms for detectingltracking targets in clutter; microstrip antennas design with suppressed radiation in horizontal directions and reduced coupling, and 6D vector antenna; optimal synthesis of a directional beam with full polarization ... |
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| Towards Analytical Convergence Analysis of Proportionate-Type NLMS Algorithms |
Jan-2008 |
5 pages |
| Authors:
Kevin T Wagner; Milos I Doroslovacki; NAVAL RESEARCH LAB WASHINGTON DC RADAR DIV
|
| To date no theoretical results have been developed to predict the performance of the proportionate normalized least mean square (PNLMS) algorithm or any of its cousin algorithms such as the micrometer-law PNLMS (MPNLMS), and the epsilon-law PNLMS (EPNLMS). In this paper we develop an analytic approach to predicting the performance of the simplified PNLMS algorithm which is closely related to the PNLMS algorithm. In particular we demonstrate the ability to ... |
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| How Extracting Information from Data Highpass Filters Its Additive Noise |
01-Nov-2007 |
23 pages |
| Authors:
Victor S Reinhardt; RAYTHEON CO EL SEGUNDO CA SPACE AND AIRBORNE SYSTEMS
|
| We examines characteristics of three types of random error measures in presence of negative power law (neg-p) noise: (a) observable residual error after removing an estimate of an information containing causal function from data, (b) jitter, the residual error with additional highpass (HP) filtering, and (c) Mth-order difference (delta) variances, such as the Allan variance (1st-order delta-variance of the fractional frequency error y(t)) and the Hadamard-Picinbono variance (2nd-order delta-variance of ... |
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| Adaptive Transceivers for Wireless Spectrum Networks |
21 AUG 2007 |
18 pages |
| Authors:
Michael L. Honig; NORTHWESTERN UNIV EVANSTON IL OFFICE OF RESEARCH SPONSORED PROJECTS
|
| This project has been concerned with joint transmitter-receiver adaptation in a distributed, peer-to-peer wireless network. Parameters that can be adapted at the transmitter include rate, power, and signatures in space-time-frequency. In this report we summarize our work on the following topics: (1) Limited feedback schemes for optimizing spatial signatures for Multi-Input Multi-Output (MIMO) channels, and power and rates for multi-carrier transmission; (2) Optimization of training overhead for MIMO block fading ... |
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| Sensitivity Functions and Their Uses in Inverse Problems |
21 JUL 2007 |
34 pages |
| Authors:
H. T. Banks; Sava Dediu; Stacey L. Ernstberger; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| In this note we present a critical review of the some of the positive features as well as some of the shortcomings of the generalized sensitivity functions "GSF" of Thomaseth-Cobelli in comparison to traditional sensitivity functions "TSF". We do this from a computational perspective of ordinary least squares estimation or inverse problems using two illustrative examples: the Verhulst-Pearl logistic growth model and a recently developed agricultural production network model. Because ... |
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| A New Class of Highly Accurate Solvers for Ordinary Differential Equations |
17 JUL 2007 |
40 pages |
| Authors:
Andreas Glaser; Vladimir Rokhlin; YALE UNIV NEW HAVEN CT DEPT OF COMPUTER SCIENCE
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| We introduce a new class of numerical schemes for the solution of the Cauchy problem for non-stiff ordinary differential equations (ODEs). Our algorithms are of the predictor-corrector type; they are obtained via the decomposition of the solutions of the ODEs into combinations of appropriately chosen exponentials, whereas the classical schemes are based on the approximation of solutions by polynomials. The resulting schemes have the advantage of significantly faster convergence, given ... |
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| Distributed Algorithms for Beamforming in Wireless Sensor Networks |
JUN 2007 |
136 pages |
| Authors:
Nikolaos Papalexidis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| Sensor nodes in a wireless sensor network (WSN) can establish a link with a UAV by using beam forming techniques to from a random array with position errors. The position errors' effect in the array performance is examined using a MATLAB-based simulation model. In order to spread the processing and communication load among the nodes, two new distributed algorithms for beam forming in WSN, based on the least squares (LS) ... |
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| An Infrared Camera Simulation for Estimating Spatial Temperature Profiles and Signal-to-Noise Ratios of an Airborne Laser-Illuminated Target |
JUN 2007 |
129 pages |
| Authors:
David F. Orth; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Airborne Laser testing and evaluation can be aided by developing a spectrally-based infrared camera simulation to explore how the target surface's specular and diffuse reflectivities affect the observed signal-to-noise ratio (SNR) and how the target's temperature in the laser spot can estimated. This simulation provides for the observed irradiance, scaled by atmospheric absorption, to consist of the target's self-emission, reflected background emission, and the path emission from the observer to ... |
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| Evaluation of the Limits to Accurate Sweat Loss Prediction During Prolong Exercise |
MAY 2007 |
11 pages |
| Authors:
S.N. Cheuvront; S.J. Montain; D.A. Goodman; L. Blanchard; M. N. Sawka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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| Sweat prediction equations are often used outside their boundaries to estimate fluid requirements and generate guidance. The limitations associated with these generalized predictions have not been characterized. The purpose of this study were to: 1)evaluate the accuracy of a widely used sweat prediction equation (SHAP) when widening it's boundaries to include cooler environments (2h) and very prolonged exercise (8h), 2) determine the independent impact of holding skin temperature constant (SHAP36), ... |
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| Passive Geolocation of Low-Power Emitters in Urban Environments Using TDOA |
MAR 2007 |
116 pages |
| Authors:
Myrna B. Montminy; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Low-power devices are commonly used by the enemy to control Improvised Explosive Devices (IEDs), and as communications nodes for command and control. Quickly locating the source of these signals is difficult, especially in an urban environment where buildings and towers can cause interference. This research presents a geolocation system that combines several geolocation and error mitigation methods to locate an emitter in an urban environment. The proposed geolocation system uses ... |
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| Numerical Calculations for Passive Geolocation Scenarios |
JAN 2007 |
|
| Authors:
Don Koks; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) ELECTRONIC WARFARE AND RADAR DIVISION
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| This report reviews work done in gaining some familiarity with methods of passive geolocation, and a search for rules of thumb that might tell us how to optimize the geolocation for a given scenario. We first cover the main approaches to collecting angle of arrival data and point out typical accuracies. Following this is an account of the mathematics used to analyze this data to produce an estimate of an ... |
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| Improved Element-Free Galerkin Method for Electromagnetic NDE Model (Preprint) |
DEC 2006 |
9 pages |
| Authors:
Xin Liu; Yiming Deng; Zhiwei Zeng; Lalita Udpa; Jeremy S. Knopp; MICHIGAN STATE UNIV EAST LANSING DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| This paper presents improvements made to enhance the Element-Free Galerkin method (EFG) for NDE applications. By using orthogonal basis functions instead of the conventional polynomial basis, the inversion of the ill-conditioned shape function matrix is eliminated. Therefore, the accuracy of the results is improved. Preliminary one-dimensional (1-D) and two-dimensional (2-D) examples are presented to demonstrate the improvement in accuracy and efficiency offered by orthogonal basis functions. |
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| In Search of Circasemidian Rhythms |
NOV 2006 |
23 pages |
| Authors:
James C. Miller; AIR FORCE RESEARCH LAB BROOKS AFB TX HUMAN EFFECTIVENESS DIR/BIODYNAMICS AND PROTECTION DIV
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| There is controversy over the existence of physiological or behavioral circasemidian (12-hour period) rhythms. However, a number of reports have shown a circasemidian error pattern in industrial and transportation environments and a circasemidian pattern in body temperature. To help us quantify the effects of fatigue, we hypothesized that body temperature, subjective sleepiness, simple response time and working memory speed would oscillate with a period of 12 hours (the circasemidian frequency); ... |
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| Development and Testing of a High-Speed Real-Time Kinematic Precise DGPS Positioning System Between Two Aircraft |
SEP 2006 |
483 pages |
| Authors:
Christopher J. Spinelli; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| This research involves the design, implementation, and testing of a high-speed, real-time kinematic, precise differential GPS positioning system for use in airborne applications such as automated aerial-refueling and close formation flying. Although many of the current ambiguity resolution techniques use the residuals from the least squares position estimation to determine the true ambiguity set, this thesis presents a novel approach to the ambiguity resolution problem, called the minimum indicator. Instead ... |
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| Comparing The Effectiveness of a90/95 Calculations (Preprint) |
SEP 2006 |
10 pages |
| Authors:
Charles Annis; Jeremy Knopp; STATISTICAL ENGINEERING PALM BEACH GARDENS FL
|
| Most practitioners see a90/95 as a static, single-point summary of an entire inspection's capability. It purports to be the size of the target having at least 90% probability of detection in 95 of 100 probability of detection (POD) experiments under nominally identical conditions. But in some situations the actual coverage is closer to 80%, rather than 95%, with 50% coverage being the median POD(a) curve itself. This paper discusses the ... |
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| Advances in Mixed Signal Processing for Regional and Teleseismic Arrays |
15 AUG 2006 |
43 pages |
| Authors:
Robert H. Shumway; CALIFORNIA UNIV DAVIS DEPT OF STATISTICS
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| This project considers possible approaches to resolving mixtures of propagating signals observed on arrays. In particular, conventional approaches such as beam-forming, MUSIC and single-signal F-statistics have flaws that will not adapt to certain mixtures. In order to solve this problem, we derive the partial F-statistic for testing for an added signal in a multiple-signal model. In this case a combination of sequential nonlinear partial F-statistics in combination with Akaike's corrected ... |
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| Maneuver Estimation Model for Geostationary Orbit Determination |
JUN 2006 |
123 pages |
| Authors:
Brian J. Hirsch; AIR FORCE INST OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| As an increasing number of geostationary satellites fill a limited number of orbital slots, collocation of satellites leads to a risk of close approach or misidentification. The ability to detect maneuvers made by these satellites using optical observations can help to prevent these problems. Such a model has already been created and tested using data from the Air Force Maui Optical and Supercomputing site. The goal of this research was ... |
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| Identification of High-Dimensional Prognostic Gene Signatures for Breast Cancer Survival |
JUN 2006 |
26 pages |
| Authors:
Derick R. Peterson; ROCHESTER UNIV NY
|
| Modern high-throughput technologies allow us to simultaneously measure the expressions of a huge number of candidate predictors, some of which are likely to be associated with survival. One difficult task is to search among an enormous number of potential predictors and to correctly identify most of the important ones, without mistakenly identifying too many spurious associations. Mere variable selection is insufficient, however, for the information from the multiple predictors must ... |
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| Near-Infrared Fuel Analysis |
03 MAY 2006 |
22 pages |
| Authors:
Joel Schmitigal; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| To perform near-infrared fuel analysis a portable, ruggedized, near infrared spectrometer is used. Chemometrics using Principal Component Analysis and Partial Least Squares or Soft Independent Modeling of Class Analogies Method (SIMCA) are performed. The technology is manufactured by Micro Optical Systems, Inc., of Suffolk, VA under an Army Small Business Innovation Research Phase 2 award in 2001. |
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| An Analytical Framework for the Optimal Design and Detection of Covert Channel Communications |
MAY 2006 |
24 pages |
| Authors:
Michael J. Medley; Stella N. Batalama; Dimitris A. Pados; STATE UNIV OF NEW YORK AT ALBANY
|
| We propose an iterative generalized least squares procedure to recover unknown messages hidden in image hosts via spread-spectrum embedding. Neither the original host nor the embedding signature is assumed available. We demonstrate that for hidden messages of sufficient length (data sample support), recovery can be achieved with probability of error close to what may be attained with known embedding signature and known original host autocorrelation matrix. For small hidden messages, ... |
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| The Anticipative Maximum Adaptive-Array Algorithm for Frequency-Hopping Systems |
APR 2006 |
56 pages |
| Authors:
Don Torrieri; ARMY RESEARCH LAB ADELPHI MD
|
| The anticipative maximin algorithm is a blind adaptive-array algorithm that exploits both the spectral and temporal characteristics of frequency-hopping signals. The anticipative maximin algorithm fuses a new form of anticipative processing with an improved version of the maximin algorithm to enable the cancellation of partial-band interference within a hopping band. Major advantages ae that the anticipative maximin algorithm requires neither training sequences, directional information, nor decision-directed adaptation. The algorithm provides ... |
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| Standard Errors and Confidence Intervals in Inverse Problems: Sensitivity and Associated Pitfalls |
02 MAR 2006 |
28 pages |
| Authors:
H. T. Banks; Stacey L. Ernstberger; Sarah L. Grove; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
|
| We review the asymptotic theory for standard errors in classical ordinary least squares (OLS) inverse or parameter estimation problems involving general nonlinear dynamical systems where sensitivity matrices can be used to compute the asymptotic covariance matrices. We discuss possible pitfalls in computing standard errors in regions of low parameter sensitivity and/or near a steady state solution of the underlying dynamical system. |
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| A Hedonic Approach to Estimating Software Cost Using Ordinary Least Squares Regression and Nominal Attribute Variables |
MAR 2006 |
125 pages |
| Authors:
Marc D. Ellis; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Software spending is increasing within the DoD, NASA, and other technologically advanced organizations, with significant effects on program budgets. Cost estimators must have the best tools available. However, many current models are problematic due to inaccuracy and unavailability of the input parameters, the technical expertise and expense required to operate them, and the difficulty in explaining their outputs. Two databases were analyzed: 60 NASA/JPL software projects and 116 projects from ... |
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| Development of K-Version of the Finite Element Method: A Robust Mathematical and Computational Procedure |
FEB 2006 |
31 pages |
| Authors:
J. N. Reddy; TEXAS A AND M UNIV COLLEGE STATION DEPT OF MECHANICAL ENGINEERING
|
| This report summarizes the research carried out under Grant F49620-03-1-0201 on the development of least-squares based finite element models of viscous compressible and incompressible flows as well as shear deformable plates and shells. The main objective of this research was to develop a robust and accurate computational methodology based on least-squares variational principles for the numerical solution of the equations governing plates and shells and viscous incompressible and compressible fluid ... |
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| The Development of Advanced Sensor Technologies to Measure Critical Navy Mobility Fuel Properties |
27 JAN 2006 |
54 pages |
| Authors:
Robert E. Morris; Kevin J. Johnson; Mark H. Hammond; Susan L. Rose-Pehrsson; NAVY TECHNOLOGY CENTER FOR SAFETY AND SURVIVABILITY WASHINGTON DC
|
| Laboratory studies have been conducted at the Naval Research Laboratory (NRL) to develop chemometric methodologies and assess measurement technologies that will enable the implementation of sensor-based instrumentation capable of measuring critical Navy mobility fuel properties. These chemometric techniques were then used to evaluate several chromatographic and spectroscopic methods for their efficacy in modeling critical fuel properties. The preliminary findings from a training set consisting of 46 jet fuels from around ... |
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| Tracking and Interception of Ground-Based RF Sources Using Autonomous Guided Munitions with Passive Bearings-Only Sensors and Tracking Algorithms |
2006 |
13 pages |
| Authors:
Kenan Ezal; Craig Agate; TOYON RESEARCH CORP GOLETA CA
|
| This paper considers the problem of tracking and intercepting a potentially moving ground-based RF source with an autonomous guided munition that has a passive bearings-only sensor located on its nose. It is assumed that the munition has lost GPS signal lock and that it relies only on its noisy inertial measurement unit (IMU) for guidance and navigation. Bearings-only target motion analysis (TMA) algorithms are used to obtain a position and ... |
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| Wavelet-Based Blind Superresolution from Video Sequence and in MRI |
31 DEC 2005 |
66 pages |
| Authors:
N. K. Bose; PENNSYLVANIA STATE UNIV UNIVERSITY PARK OFFICE OF SPONSORED PROGRAMS
|
| The first contribution of this research is the development of a mathematical framework for deployment of second-generation wavelets for image superresolution. Second, the Biggs-Andrews multichannel iterative blind deconvolution (IBD) algorithm is modified to include the blur support estimation module. Then the asymmetry factor for the Richardson-Lucy update-based IBD algorithm is calculated. Simulations conducted on real-world and synthetic images confirm the importance of accurate support estimation in the blind superresolution problem. ... |
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| Transport Imaging for the Study of Quantum Scattering Phenomena in Next Generation Semiconductor Devices |
DEC 2005 |
113 pages |
| Authors:
Frank M. Bradley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
| The minority carrier diffusion length is a critical parameter in the development of next generation Heterostructure Bipolar Transistors (HBT) and highly efficient solar cells. A novel technique has been developed utilizing direct imaging of electron/hole recombination via an optical microscope and a high sensitivity charge coupled device coupled to a scanning electron microscope to capture spatial information about the transport behavior (diffusion lengths/drift lengths) in luminescent solid state materials. In ... |
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| Improved Geo-Spatial Resolution Using a Modified Approach to the Complex Ambiguity Function (CAF) |
SEP 2005 |
119 pages |
| Authors:
Glenn D. Hartwell; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this thesis is to implement the CAF-Map method of geolocation in MATLAB. This method is a modification to the traditional Cross Ambiguity Function (CAF) based TDOA, FDOA geolocation where TDOA and FDOA are determined by locating the peak in the CAF plane and then the peak's information is fed to a Least Squares like geolocation tool to determine the emitters geolocation. This method omits the step in ... |
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| Analysis of an Emitter Location Algorithm for use in ESM Systems |
SEP 2005 |
|
| Authors:
J. S. Groot; TNO Defence Security and Safety The Hague (Netherlands)
|
| The report analyses a least squares algorithm for 3D emitter location. The data used is a time series of frequency measurements performed by an airborne receiver, in conjunction with speed and position measurements of the platform. The analysis is done analytically as well as through Monte Carlo simulation. The accuracy generally improves with decreasing frequency and speed errors. A larger RF and a frequent frequency measurement are also beneficial, as ... |
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| The Returns to Human Capital Migration within the Department of Defense Civilian Internal Labor Market |
SEP 2005 |
69 pages |
| Authors:
Miguel S. Macias; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The objective of this thesis is to examine the returns to mobility of civilian personnel within the Department of Defense (DoD). This study employs panel data provided by the Defense Manpower Data Center (DMDC) and drawn from the Department of Defense Civilian Personnel Data Files. The data set consisted of 21,143 personnel who were new hires in the years 1994-1995. Between 1994-1995 and 2003, 3,267 (15.4%) employees were interstate migrants. ... |
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| Determining the Applicability of the Barotropic Approximation to the Mean Seasonal Flow Through the Tsushima/Korean Strait using Variational Assimilation |
21 JUL 2005 |
22 pages |
| Authors:
S. R. Smith; G. A. Jacobs; R. R. Leben; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
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| Variational assimilation is used to combine velocity and sea-surface height anomaly (SSHA) measurements with a system of dynamics to estimate the seasonal flow through the Taushima/Korean Strait for the summer, autumn and winter seasons of 1999-2000. The velocity measurements are from two lines of moored acoustic Doppler Current profilers (ADCPs) spanning the Tsushima/Korean strait just north and south of Tsushima island and the SSHA measurements are from the TOPEX altimeter. ... |
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| An Invariant Representation for Matching Trajectories Across Uncalibrated Video Streams |
MAY 2005 |
11 pages |
| Authors:
Walter Nunziati; Stan Sclaroff; Alberto Del Bimbo; BOSTON UNIV MA DEPT OF COMPUTER SCIENCE
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| We introduce a view point invariant representation of moving object trajectories that can be used in video database applications. It is assumed that trajectories lie on a surface that can be locally approximated with a plane. Raw trajectory data is first locally approximated with a cubic spline via least squares fitting. For each sampled point of the obtained curve, a projective invariant feature is computed using a small number of ... |
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| Hybrid Feedforward-Feedback Active Noise Control for Hearing Protection and Communication |
01 APR 2005 |
11 pages |
| Authors:
Laura E. Ray; Jason A. Solbeck; Robert D. Collier; DARTMOUTH COLL HANOVER NH
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| Research over the past decade has demonstrated substantial increases in noise reduction performance for circumaural hearing protectors through feedforward active noise reduction (ANR) based on least mean square (LMS) methods. However, commercialization of feedforward ANR hearing protection devices has yet to occur. This paper explores issues related to robust realization of feedforward ANR for hearing protection. Specifically, the dynamic range of noise sources, the potential for leakage around circumaural earcups, ... |
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| Maneuver Estimation Model for Relative Orbit Determination |
21 MAR 2005 |
77 pages |
| Authors:
Tara R. Storch; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| While the use of relative orbit determination has reduced the difficulties inherent in tracking geosynchronous satellites that are in close proximity, the problem is often compounded by stationkeeping operations or unexpected maneuvers. If a maneuver occurs, observations will no longer fit predicted data, increasing the risk of misidentification and cross-tagging. The goal of this research was to develop a model that will estimate the magnitude, direction, and time of a ... |
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Reports by Keyword(s)
LEAST SQUARES METHOD
