| Localization of Surface or Near-surface Drifting Mines for Unmanned Systems in the Persian Gulf |
Jun 2012 |
85 pages |
| Authors:
Meng W Yau; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | This thesis investigates the combined use of ocean models, such as idealized surface current flows, and search models, including expanding area and discrete myopic search methods, to improve the probability of detecting a near-surface, drifting object over time. Enhanced search effectiveness is facilitated by the use of robotic search agents, such as a tactical unmanned underwater vehicle (UUV) or unmanned aerial vehicle (UAV), leveraging simulation methods to inform the search ... |
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| Joint DOD/DOA Estimation in MIMO Radar Exploiting Time-Frequency Signal Representations |
08 May 2012 |
32 pages |
| Authors:
Yimin D Zhang; Moeness G Amin; Braham Himed; VILLANOVA UNIV PA
|
| In this article, we consider the joint estimation of direction-of-departure (DOD) and direction-of- arrival (DOA) information of maneuvering targets in a bistatic multiple-input multiple-output (MIMO) radar system that exploits spatial time-frequency distribution (STFD). STFD has been found useful in solving various array processing problems, such as direction finding and blind source separation, where nonstationary signals with time-varying spectral characteristics are encountered. The STFD approach to array processing has been primarily ... |
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| Combining Analyst and Waveform-Correlation-Based Arrival Time Measurements in the Bayesloc Multiple-Event Location Algorithm |
Sep 2011 |
8 pages |
| Authors:
Stephen C Myers; Gardar Johannesson; Douglas A Dodge; Nathan A Simmons; LAWRENCE LIVERMORE NATIONAL LAB CA
|
| We add relative arrival-time measurements that are derived from waveform correlation to the Bayesloc multiple-event location algorithm. Bayesloc is a formulation of joint probability over event locations, travel time corrections phase labels, and arrival-time measurement errors. The Bayesloc formulation is hierarchical with distinct statistical models for each component of the multiple-event system, including prior constraints for any of the parameters. Bayes' Theorem allows calculation of the joint probability for hypothesized ... |
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| Efficacy of Various Waveforms to Support Geolocation |
Jun-2009 |
185 pages |
| Authors:
Crnkovich; Joseph G Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis investigates the impact of various waveform parameters on the ability to estimate accurately the position of the source of a known data-less emission that is visible to multiple simultaneous collectors. It provides an overview of the basic geolocation problem and identifies various parameters affecting geolocation accuracy, showing those that are affected by the waveform and those that are not. Performance estimates are provided for detecting the signal and ... |
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| MDA DS COI Spiral 3 - NOA, SILO and ABAC |
Jun-2009 |
82 pages |
| Authors:
Jay Spalding; Jim Harmon; Alistair Nicol; Mark MacKinnon; COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT
|
| The purpose of this report is to document United States Coast Guard (USCG) Research and Development (R&D) efforts in support of the Maritime Domain Awareness Data Sharing Community of Interest (MDA DS COI) Spiral 3 Project. The project focuses on sharing the sensitive data associated with Notice of Arrival (NOA) messages and the Single Integrated LookOut (SILO) list in a net-centric Web-services environment. It documents the background of the efforts ... |
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| Fusion of Inertial Sensors and Orthogonal Frequency Division Multiplexed (OFDM) Signals of Opportunity for Unassisted Navigation |
Mar-2009 |
65 pages |
| Authors:
Jason G Crosby; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The advent of the global positioning system (GPS) has provided worldwide high-accuracy position measurements. However, GPS may be rendered unavailable by jamming, disruption of satellites, or simply by signal shadowing in urban environments. Thus, this thesis considers fusion of Inertial Navigation Systems (INS) and Orthogonal Frequency Division Multiplexed (OFDM) signals of opportunity (SOOP) for navigation. Typical signal of opportunity navigation involves the use of a reference receiver and uses time ... |
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| Sniper Localization for Asynchronous Sensors |
Dec-2008 |
6 pages |
| Authors:
Thyagaraju Damarla; Gene Whipps; Lance Kaplan; ARMY RESEARCH LAB ADELPHI MD
|
| This paper describes a novel sniper localization method for a network of sensors. This approach relies only on the time difference of arrival (TDOA) between the muzzle , and shock wave from multiple singlesensor nodes, relaxing the need for precise time synchronization across the network. This method is best suited where an array of sensors, on a per-node basis, is not feasible. We provide results from data collected in a ... |
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| Analysis and Optimization of the Emergency Department at Beth Israel Deaconess Medical Center via Simulation |
JUN 2008 |
|
| Authors:
Clay W. Noyes; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
 | We develop a simulation model based on patient data from 2/1/05 to 1/31/06 that represents the operations of the Emergency Department at Beth Israel Deaconess Medical Center, a Harvard teaching hospital and a leading medical institution. The model uses a multiclass representation of patients, a time-varying arrival process module that uses multivariate regression to predict future patient arrivals, and a service module that takes into account the fact that service ... |
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| High-Resolution Seismic Velocity and Attenuation Structure of the Sichuan-Yunnan Region, Southwest China, Using Seismic Catalog and Waveform Data |
13 JUL 2007 |
62 pages |
| Authors:
Haijiang Zhang; Yunfeng Liu; Clifford H. Thurber; Zhen Xu; Xiaodong Song; WISCONSIN UNIV-MADISON
|
| The Sichuan-Yunnan region in southwestern China lies in the transition zone between the uplifted Tibetan plateau to the west and the Yangtze continental platform to the east. This region has a very complicated geological structure and is one of the most active areas of continental earthquakes in the world. This two-year project is to develop high-resolution models of the velocity and attenuation structure of the Sichuan-Yunnan region (longitudes ~97-108 degrees ... |
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| Implementation of Get with the Guideline Acute Myocardial Infarction Program at Johns Hopkins Hospital and Its Effect on Core Measures |
25 MAY 2007 |
38 pages |
| Authors:
Jason P. Richter; JOHNS HOPKINS HOSPITAL BALTIMORE MD
|
| John Hopkins Hospital implemented the Get with the Guidelines (GWTG) evidence-based program for use with patients who have Acute Myocardial Infarction (AMI), a component of Congenital Heart Disease (CHD). CHD is the single leading cause of death for persons in the United States. The GWTG program is a web-based tool developed by the American Heart Association (AHA) that allows for data entry and benchmarking of AHA guidelines. The stated goal ... |
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| Reducing the "Gap of Pain": A Strategy for Optimizing Federal Resource Availability in Response to Major Incidents |
MAR 2007 |
105 pages |
| Authors:
Curtis L. Heidtke; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In large-scale domestic disasters, a temporal gap frequently develops between the exhaustion of state and local resources and the arrival of federal resources. To date, strategies for reducing this so-called gap of pain have not been based upon scientific methodology. This thesis reviews four alternatives for ensuring continuous availability of critical commodities: pre-positioning, pre-emptive federal action, time-phased deployment, and surge transportation. For a given scenario, the optimum approach is likely ... |
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| UAV Scheduling via the Vehicle Routing Problem with Time Windows (Preprint) |
JAN 2007 |
17 pages |
| Authors:
Amanda L. Weinstein; Corey Schumacher; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| In an urban environment, multiple small unmanned aerial vehicles (UAVs) may be utilized to locate, surveil, or attack various targets. Whatever the task, the air vehicles must cooperate by efficiently communicating with each other and optimally assigning each UAV to the appropriate task at the appropriate target and at the appropriate time. In this paper, a vehicle assignment algorithm is developed using a mixed integer linear program (MILP) to find ... |
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| Navigation Using Signals of Opportunity in the AM Transmission Band |
SEP 2006 |
120 pages |
| Authors:
Jonathan A. McEllroy; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Maintaining a precision navigation solution both in a GPS hostile jamming environment and also in a GPS non-compatible terrain area is of great importance. To that end, this thesis evaluates the ability to navigate using signals from the AM band of the electromagnetic spectrum (520 to 1710 kHz). Navigation position estimates are done using multi-lateration techniques similar to GPS. However, pseudoranges are created using Time Difference of Arrival (TDOA) distances ... |
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| Evaluation of Cross-Correlation Methods on a Massive Scale for Accurate Relocation of Seismic Events in East Asia |
21 APR 2006 |
72 pages |
| Authors:
Paul G. Richards; Felix Waldhauser; Won-Young Kim; David Schaff; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| A weakness of traditional methods of seismic event location is their susceptibility to errors in picking arrival times of regional phases such as Pn, Pg, and teleseismic phases. We evaluate the practical utility of waveform cross-correlation as a way to reduce or remove pick error, applied to large datasets in seismically active regions of East Asia, for purposes of obtaining significant improvements in event location. Key ideas in this project ... |
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| A Model of Border Patrol to Support Optimal Operation of Border Surveillance Sensors |
DEC 2005 |
47 pages |
| Authors:
Dolev Cfir; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH
|
| Borders are monitored by a variety of moving and stationary sensors, e.g., patrol agents, video cameras, ground sensors, UAVs, etc. This paper introduces a model for a moving sensor that patrols a perimeter that is infiltrated by malevolent agents (targets). Targets arrive according to a Poisson process along the perimeter with a certain distribution of arrival location, and disappear (renege) a random amount of time after their arrival. The measures ... |
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| Chip Discrimination for UWB Impulse Radio Networks in Multipath Channels |
AUG 2005 |
93 pages |
| Authors:
Jon R. Ward; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The recent need for increasingly higher data rates and the ability to utilize unused spectrum has fueled growing interest in UWB from both academia and industry. A variety of UWB physical layer applications have been proposed and implemented including: highspeed, short-range indoor wireless personal area networks (WPAN s), product sensor tags, and low-power, covert military networks. Much of the UWB literature focuses on the Impulse Radio (IR) variety which is ... |
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| Estimation of a Buried Pipe Location by Borehole Radar |
25 JUL 2005 |
5 pages |
| Authors:
Kazunori Takahashi; Motoyuki Sato; TOHOKU UNIV SENDAI (JAPAN) GRADUATE SCHOOL OF ENVIRONMENTAL STUDIES
|
| A new parametric inversion technique to estimate a buried pipe's location was developed for borehole radar cross-hole measurements. This technique evaluates the shapes of the approximated and measured arrival time curves instead of the first arrival time itself or wavefield in conventional inversion or tomographic techniques. In this study, the authors propose an algorithm of the technique and demonstrate its performance for synthetic and measured data sets. |
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| The Navigation Potential of Signals of Opportunity-Based Time Difference of Arrival Measurements |
MAY 2005 |
256 pages |
| Authors:
Kenneth A. Fisher; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research introduces the concept of navigation potential, NP, to quantify the intrinsic ability to navigate using a given signal. NP theory is a new, information theory-like concept that provides a theoretical performance limit on estimating navigation parameters from a received signal that is modeled through a stochastic mapping of the transmitted signal and measurement noise. NP theory is applied to SOP-based TDOA systems in general as well as for ... |
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| One-vs-One Multiclass Least Squares Support Vector Machines for Direction of Arrival Estimation |
19 NOV 2003 |
12 pages |
| Authors:
Judd A. Rohwer; Chaouki T. Abdallah; SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| This paper presents a multiclass, multilabel implementation of Least Squares Support Vector Machines (LS-SVM) for DOA estimation in a CDMA system. For any estimation or classification system the algorithm's capabilities and performance must be evaluated. This paper includes a vast ensemble of data supporting the machine learning based DOA estimation algorithm. Accurate performance characterization of the algorithm is required to justify the results and prove that multiclass machine learning methods ... |
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| UAV Task Assignment with Timing Constraints |
JUL 2003 |
9 pages |
| Authors:
Corey Schumacher; Phillip Chandler; Meir Pachter; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| This paper addresses the problem of task allocation for wide area search munitions. The munitions are required to search for, classify, attack, and verify the destruction of potential targets. We assume that target field information is communicated between all elements of the swarm. We generate a tour of optimal assignments for each vehicle using a Mixed Integer Linear Program, or MILP format. MILP can assign tasks that look infeasible, due ... |
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| Analysis of Scheduling Policies for a M/G/1 Queue with Rework |
MAR 2003 |
55 pages |
| Authors:
Jennifer K. Hendrixson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This thesis analyzes a multi-class M/G/1 priority queueing system in which distinct job types require one service cycle and, with non-zero probability, require a second service cycle. The main objective is to find a new heuristic scheduling policy that minimizes the long-run expected holding and preemption costs. Arrival rates, service rates, and the probability of undertaking second service are all class specific. A mean value analysis (MVA) approach was employed ... |
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| Sonic Boom Generated by Reentry of Mir |
10 SEP 2002 |
20 pages |
| Authors:
D. M. Moody; AEROSPACE CORP EL SEGUNDO CA ENGINEERING AND TECHNOLOGY GROUP
|
| The Russian space station, Mir, was actively deorbited to impact in the South Pacific on 23 March 2001. Mir was the largest body in Earth orbit ever to be deorbited in a controlled fashion. As such, it provided a unique opportunity to observe, at a known time and location, what happens to such a large object as it re-enters the earth's atmosphere. The reentry and breakup were videotaped from the ... |
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| The Analysis of Sophisticated Direction of Arrival Estimation Methods in Passive Coherent Locators |
MAR 2002 |
|
| Authors:
Ahmet Ozcetin; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| In passive coherent locators (PCL) systems, noise and the precision of direction of arrival (DOA) estimation are key issues. This thesis addresses the implementation of sophisticated DOA estimation methods, in particular the multiple signal classification (MUSIC) algorithm, the conventional beam forming (CBF) algorithm, and the algebraic constant modulus algorithm (ACMA). The goal is to compare the ACMA to the MUSIC, and CBF algorithms for application to PCL. The results and ... |
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| The Cosmic Ray Ground Level Enhancement of 6 November 1997 |
2002 |
5 pages |
| Authors:
J. L. Lovell; M. L. Duldig; J. E. Humble; M. A. Shea; D. F. Smart; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| The relativistic solar proton event of 6 November 1997 resulted in the first ground-level enhancement (OLE) of solar cycle 23. The earliest onset was around 1215 UT but was up to 15 minutes later at some neutron monitor locations. The time of maximum intensity also varied significantly over the world-wide neutron monitor network. The modeled particle distributions and spectra are presented. The apparent particle arrival direction is found to be ... |
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| The Breakdown Fields and Risetimes of Select Gases Under Conditions of Fast Charging (^20 ns and Less) and High Pressures (20-100 Atmospheres) |
NOV 2001 |
104 pages |
| Authors:
Vic Carboni; TITAN SYSTEMS CORP SAN LEANDRO CA PULSE SCIENCES DIV
|
| An interest in wideband impulse-radiating systems has brought about the need to develop high-voltage timed-array antennas that can focus and steer an electromagnetic pulse in the far field. To produce desirable radiated signal levels in the far field these arrays will need to be driven by high-voltage high-power sources that at least in the short term will have to rely on pulsers based on gas spark gap technology. To produce ... |
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| Localization of Wireless Communication Emitters Using Time Difference of Arrival (TDOA) Methods in Noisy Channels |
JUN 2001 |
|
| Authors:
Spiros D. Mantis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The ability to provide position information of wireless emitters comprises a very important communication tool and has extremely valuable applications to military as well as civilian life. GSM is the most popular method of modulation adopted around the world, for mobile telephony. This thesis is focused on the Time Difference Of Arrival (TDOA) estimation, applied to GSM signals, in noisy channels. Improvements in denoising, in conjunction with wavelet processing, are ... |
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| Kalman Filtering of FDOA/TDOA Missile Tracin System |
MAR 2001 |
|
| Authors:
Heng C. Lin; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The accuracy of a tracking system designed to determine the time, space and position information (TSPI) of an airborne missile by detecting its telemetry signal at a number of receiver sites is investigated. Doppler frequency measurements are converted to range differences between the missile and receiver sites, whose locations are known in three dimensions. An algorithm then utilizes these range differences to obtain the missile TSPI. The accuracy of the ... |
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| Generation Of Global System for Mobile (GSM) Signals and their Time Difference of Arrival (TDOA) Estimation |
JUN 2000 |
89 pages |
| Authors:
Timothy N. Haney; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Emitter localization is a very important communications tool that will be extremely valuable to a multitude of different military as well as civilian applications. In many parts of the world, GSM is the preferred method of modulation used in mobile phone traffic. This thesis addresses the time difference of arrival estimation applied to GSM type signals using wavelet-based techniques. Signals are generated using the Hewlett-Packard Advanced ... |
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| Coherent Acoustic Communications During the Littoral Warfare Advanced Development 99-1 Experiment |
22 MAY 2000 |
40 pages |
| Authors:
Azmi Al-Kurd; Jeffrey Schindall; NAVAL RESEARCH LAB WASHINGTON DC
|
| Coherent acoustic communication experiments were performed during the Littoral Warfare Advanced Development exercise in the Gulf of Mexico in February 1999 (LWAD 99-1). The Acoustic Communication (ACOMM) experiment was allotted four segments of 5 hours each and two segments of one hour each. The ACOMM waveforms were projected using two mid-frequency acoustic sources (F-80 and F- 56) and received at multiple platforms using vertical line arrays (VLA), ... |
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| The Deployment of Visual Attention: Two Surprises |
MAR 2000 |
11 pages |
| Authors:
Jeremy M. Wolfe; BRIGHAM AND WOMEN'S HOSPITAL BOSTON MA
|
| The visual system is not capable of processing of all aspects of a scene in parallel. While some visual information can be extracted from all locations at once, other processes, including object recognition, are severely limited in their capacity. Selective attention is used to limit the operation of these limited-capacity processes to one (or, perhaps, a few) objects at a time. Searching for a target in a scene, therefore, requires ... |
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| Interpolation Approximations for M/G/infinity Arrival Processes |
1999 |
17 pages |
| Authors:
Konstantinos P. Tsoukatos; Armand M. Makowski; MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH
|
| We present an approximate analysis of a discrete-time queue with correlated arrival processes of the so-called M | G | infinity type. The proposed heuristic approximations are developed around asymptotic results in the heavy and light traffic regimes. Investigation of the system behavior in light traffic quantifies the differences between the gradual M | G | infinity inputs and the point arrivals of a classical GI|GI|1 queue. In heavy traffic, ... |
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| Stabilization and Suppression of a Diffusion Flame Behind a Step |
1999 |
5 pages |
| Authors:
Fumiaki Takahashi; W. John Schmoll; Vincent M. Belovich; DAYTON UNIV OH RESEARCH INST
|
| Using a flow visualization technique, stabilization and suppression of a nonpremixed methane flame behind a backward-facing step in a wind tunnel have been studied by impulsively injecting a gaseous fire-extinguishing agent into the airflow. As the mean air velocity was increased, two distinct flame stabilization and suppression regimes were observed: rim-attached wrinkled laminar flame and wake-stabilized turbulent flame. In the former, the flame detached immediately after agent arrival, while in ... |
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| Estimating the Acoustic Modal Arrivals Using Signals Transmitted from Two Sound Sources to a Vertical Line Hydrophone Array in the 1996 Shelfbreak Primer Experiment |
JUN 1998 |
45 pages |
| Authors:
Christopher W. Miller; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| During the 1996 multi-institutional Shelfbreak PRIMER experiment, low frequency sound sources were moored on the continental slope south of Cape Cod. These sources transmitted phase encoded tomography signals which were monitored by vertical-line hydrophone arrays moored on the continental shelf. The measured signals were processed for the acoustic modal arrivals and their variability in time. The processing entailed pulse compression, coherent averaging, local sound-speed profile updates ... |
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| LB/TS Optical Blast Measurement |
MAY 1998 |
55 pages |
| Authors:
Herman J. Carpenter; David J. Michalski; CARPENTER RESEARCH CORP ROLLING HILLS ESTATES CA
|
| A laser beam system for measuring airshock time of arrival (TOA) was designed and developed for use in the Defense Special Weapons Agency's (DSWA's) Large Blast and Thermal Simulator (LB/TS). A limited array of four laser bearns was installed and exercised in three test shots in LB/TS. The shock TOA was measured with high precision (0.5 micros). The shock overpressure was computed from the shock TOA measurements and compared with ... |
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| Determining the Optimal Operational Concept in the Orthopedic Clinic Using Simulation |
APR 1998 |
101 pages |
| Authors:
William B. Grimes; ACADEMY OF HEALTH SCIENCES (ARMY) FORT SAM HOUSTON TX HEALTH CARE ADMINISTRATION
|
| The total time a patient spends in an Orthopedio Clinic was studied using computer simulation. Patient arrival patterns, patient flow patterns, and time distributions were developed and the data was entered into a computer simulation program. Results of the simulation yielded insights into clinic dynamics. Proposed operational changes should significantly decrease the average patient total time in clinic from 74.54 (SD 16.32) minutes to 51.42 (SD ... |
|
| Nd:YLF Laser System for the Study of Termolecular Reactions and Metastable Isomers of Polyatomic Molecules |
31 DEC 97 |
4 pages |
| Authors:
Robert E. Continetti; CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF CHEMISTRY
|
| The DURIP grant F49620-97-1-0255 has supported acquisition of a state-of-the-art regeneratively amplified Ti:Sapphire laser system. This laser system is the primary laser for our new multi-particle photoelectron photofragment coincidence spectrometer, and is currently being used to carry out experiments on three-body dissociation dynamics in clusters of oxygen and ozone. These experiments make use of a new particle detector built in our laboratory capable of recording the ... |
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| Just-In-Case or Just-In-Time. Total Asset Visibility and Just-In-Time Distributions Impact on Future Class IX Repair Parts Operations in US Army COSCOMS and DISCOMS |
18 DEC 1997 |
86 pages |
| Authors:
Franklin D. Roach; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS SCHOOL OF ADVANCED MILITARY STUDIES
|
| Under public pressure to reduce defense spending and a Congressional demand for increased efficiency created by the collapse of the Soviet Union during the early 1990's, the United States Army has repeatedly been accused of maintaining unnecessary and expensive inventories of class IX repair parts throughout its supply system. In contrast, private industry has dramatically reduced its repair parts inventory levels, while reducing order ship ... |
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| Why Mission Threads Aren't Good Enough |
JUN 97 |
11 pages |
| Authors:
Ann Brodeen; George Hartwig; Maria Lopez; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| For many years military command and control systems have been evaluated by the use of mission threads. Mission threads arise from operational requirements and are designed so that a system's response to a series of selected scenario events can be quantified. They may be used to answer timeline and routing questions such as: 'How long does it take to complete a mission?' 'How can information be more effectively routed?' 'Where ... |
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| Modeling and Analyzing the Effect of Ground Refueling Capacity on Airfield Throughput |
MAR 97 |
130 pages |
| Authors:
W. H. Rushing; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| This thesis develops five analytical models to understand the current ground refueling process, to optimize the airfield configuration and to determine the refueling policy which maximizes throughput, the primary measure of airfield efficiency. This study models the airfield refueling process as a continuous time Markov process to adequately represent the inherent stochastic nature of the transitory ground refueling system and provide an analytical evaluation of various airfield configurations. Also, the ... |
|
| A Comparison of Vector-Sensing and Scalar-Sensing Linear Arrays |
27 JAN 97 |
49 pages |
| Authors:
Benjamin A. Cray; Albert H. Nuttall; NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
|
| Some of the features which are unique to beamforming a linear array of vector sensors, not present with scalar-sensing elements (such as conventional pressure sensors), are described in this report. Vector sensors measure acoustic particle motion, for example acoustic particle velocity, in a given direction and these vectors have complex-valued components which are proportional to the amplitude and phase of a propagating acoustic field. Three types of vector sensors are ... |
|
| Optimizing Submarine Berthing with a Persistence Incentive |
01-Jan-1997 |
19 pages |
| Authors:
Gerald G Brown; Kelly J Cormican; Siriphong Lawphongpanich; Daniel B Widdis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH
|
| Submarine berthing plans reserve mooring locations for inbound U.S. Navy nuclear submarines prior to their port entrance. Once in port, submarines may be shifted to different berthing locations to allow them to better receive services they require or to make way for other shifted vessels. However, submarine berth shifting is expensive, labor intensive, and potentially hazardous. This article presents an optimization model for submarine berth planning and demonstrates it with ... |
|
| Small-Scale Hydrodynamics of Biological Sensors |
21 MAY 96 |
|
| Authors:
Mimi A. Koehl; CALIFORNIA UNIV BERKELEY SPONSORED PROJECTS OFFICE
|
| A critical step in the process of olfaction is the arrival of chemical signals from the environment to the surface of a chemosensory structure. Many organisms use appendages bearing arrays of microscopic hairs to pick up chemical signals from the surrounding water or air. The fluid flow field in the immediate vicinity of a sensory hair determines the rates at which molecules are captured. We have been identifying aspects of ... |
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| Prioritization of Army Strategic Mobility Program Resources (PASMPR) |
MAY 96 |
90 pages |
| Authors:
Patricia Murphy; ARMY CONCEPTS ANALYSIS AGENCY BETHESDA MD
|
| The US Army has become a force based primarily in the United States, which increases the need to transport units rapidly overseas. The study is sponsored by ODCSLOG and involves the prioritization of about 400 deployment enhancements that are competing for funding in the 1996-2001 timeframe, at a cost of about $4 billion. A large scale mixed integer programing formulation is presented to solve the problem of deciding which projects ... |
|
| A User's Guide for Creating Risk-Based Mobility Products in CAMMS-D |
MAY 96 |
171 pages |
| Authors:
J. L. Williamson; N. C. Deliman; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| Conventional mobility analysis is concerned with generating a speed prediction for one vehicle or a unit of vehicles operating in specified terrain to identify areas of immobilization and derive other information, such as time associated with traversing a given route. The risk-based approach moves beyond conventional mobility analysis by factoring in uncertainty concerning actual vehicle speed to present a range of speeds. This information can be used to derive useful ... |
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| Estimation of Target Angular Position Under Mainbeam Jamming Conditions |
DEC 95 |
|
| Authors:
Mylene Toulgoat; Ross M. Turner; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A phased array multifunction radar (MFR) with an agile pencil beam will invariably employ a monopulse system for precise angle measurement. Such a monopulse system has three receiver channels, one channel for each of the sum, azimuth and elevation difference beamformers. This report considers a modest expansion of the number of receiving channels from three to five channels. The five channels comprise the sum channel beamformer and each half of ... |
|
| Modelling Time-of-Arrival Ambiguities in a Combined Acousto-Optic and Crystal Video Receiver |
NOV 1995 |
|
| Authors:
Simon Rockliff; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
|
| The probability of pulses overlapping in time being received by a combined acousto-optic/crystal video receiver is investigated. Theoretical analysis and computer simulation results are compared for a variety of high pulse density scenarios and for two crystal video band configurations. Upper and lower bounds are derived for the probability of coincidence. It is shown that a small number of high duty cycle emitters will cause an unacceptable number of pulses ... |
|
| The Influence of Generic Airspace on Air Traffic Controller Performance |
NOV 95 |
80 pages |
| Authors:
J. A. Guttman; Earl Stein; S. Gromelski; FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ
|
| The generic sector evaluated in this study was based on a four-corner post operation typically used in many terminal areas in tne United States. Arrival aircraft originated from one of four arrival fixes just outside the sector boundaries. These arrival routes can be thought of as spokes of a wheel with the main airport site as the hub. In addition to the main airport, there were three satellite airports that ... |
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| Real-Time Analysis of a Spread Spectrum Environment with an Optoelectronic Cyclic Cross Correlation: Proof-of-Concept Experiments |
OCT 95 |
|
| Authors:
N. Brousseau; J. W. Salt; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The purpose of this technical note is to present a new algorithm to obtain real-time information for electronic support measures for wideband, low probability of intercept radar and communication signals. This algorithm is the Cyclic Cross Correlation (CCC). It allows the detection, separation and characterization of spread spectrum signals having overlapped spectrum, the same carrier frequency and the same difference of time of arrival. An optoelectronic real-time implementation of the ... |
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| A Computer Simulation and Analysis of the Forward Surgical Team |
SEP 95 |
99 pages |
| Authors:
Robert L. Syvertson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| To meet the challenge of providing effective combat health care on the modern battlefield, the Army Medical Department is designing a unit that will provide far forward surgery to stabilize the most seriously injured casualties. A Forward Surgical Team (FST) can provide emergency surgery to casualties prior to evacuation to an Army hospital. The model documented in this thesis is a simulation of casualty flow through a FST that will ... |
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| The Effects of Structured Arrival and Departure Procedures on TRACON Air Traffic Controller Memory and Situational Awareness. |
SEP 1995 |
103 pages |
| Authors:
Randy L. Sollenberger; Earl S. Stein; FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ
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| Air traffic control (ATC) is conducted by men and women of the Federal Aviation Administration's (FAA) air traffic service. Controllers do an excellent job of keeping aircraft separated and safe. However, they do make mistakes. Many of these errors are caused by the limitations of working memory, which controllers continuously use to maintain situational awareness (SA) An experiment was conducted at the FAA Technical Center Human Factors Laboratory to examine ... |
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