| Chip-To-Chip Optical Interconnection Using MEMS Mirrors |
26-Mar-2009 |
126 pages |
| Authors:
Tod Laurvick; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
 | This experiment explores the use of MEMS mirrors to direct subsurface optical signals to another device and reception of those signals for use in chip to chip communications. Devices were built in PolyMUMPs to control horizontal and vertical beam direction and tilting in the outgoing signal and MEMS beam splitters for the incoming signal. Several elements of the outgoing beam path were successful and those which needed improvement indicate a ... |
|
| The Modular Clock Algorithm for Blind Rendezvous |
26-Mar-2009 |
103 pages |
| Authors:
Nicholas C Theis; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A new algorithm, the modular clock algorithm, is developed and analyzed as a solution for the simple rendezvous environment model, coupled with a modified version for environment models with less information. This thesis examines the rendezvous problem as it exists in a Dynamic Spectrum Access cognitive network. Specifically, it addresses the problem of rendezvous in an infrastructureless environment. The thesis includes a taxonomy of commonly used environment models, and analysis ... |
|
| Characterizing Component Hiding Using Ancestral Entropy |
26-Mar-2009 |
201 pages |
| Authors:
Jason A Williams; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In this research, the problem of software protection and the attributes that define that protection is considered. Specifically, how to protect programs defined as structural combinational logic gates. Obfuscation is one technique for protecting such circuits and involves replacing an original circuit with a functionally equivalent variant that has some definable hiding property. The difficulty of reverse engineering versus identifying and recovering the original components or sub-circuits within an original ... |
|
| Range Estimation Algorithm Comparison in 3-D Flash LADAR Data |
Mar-2009 |
102 pages |
| Authors:
Steven P Jordan; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Peak, maximum likelihood (ML), and matched filter (MF) range estimation algorithms were tested in both simulated and measured 3-D Flash LADAR data. A normalized version of the MF was also developed and tested. Three different methods based on averaging were developed to calibrate the pulse width of the reference waveform used in the MF and ML algorithms. Simulation results show that a MF produces a bias when waveforms are cropped ... |
|
| Unified Behavior Framework in an Embedded Robot Controller |
Mar-2009 |
67 pages |
| Authors:
Stephen S Lin; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Recent technological advances produce small, inexpensive, embedded hardware platforms that are powerful enough to match robots from just a few years ago. The Unified Behavior Framework is a flexible, responsive control architecture that has not been applied on embedded systems in robots. This thesis presents a development of the Unified Behavior Framework on the Mini-WHEGSTM, a biologically inspired, embedded robotic platform, which is a small robot that utilize wheel-legs to ... |
|
| Implementation of Collaborative RF Localization Using a Software-Defined Radio Network |
Mar-2009 |
100 pages |
| Authors:
Augustine A Honore; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This thesis investigates the use of collaboration between sensor nodes that were tasked with localizing a radio frequency emitter. Localization is a necessary component for dynamic spectrum access. Using a set of software-defined radios as our sensors and a received signal strength-based maximum likelihood localization algorithm, we successfully localized transmitting nodes based on their received signal strength. Our experiment was conducted outdoors using a flexible topology that could be shaped ... |
|
| Exploitation of Geographic Information Systems for Vehicular Destination Prediction |
Mar-2009 |
205 pages |
| Authors:
Richard T Muster; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research proposes that vehicles in an urban setting subject to persistent Intelligence Surveillance and Reconnaissance will exhibit attributes that make it possible to predict their future position within a time-horizon. GeoSpatial Information Systems obtained from municipal, commercial, or hyperspectral sources may be used to model an urban grid and to make use of graph-theoretic search algorithms that can prune the future state-space of the vehicle's immediate environment. The results ... |
|
| Application of Time-Frequency Representations To Non-Stationary Radar Cross Section |
Mar-2009 |
227 pages |
| Authors:
John McShane; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Radar Cross Section imaging of a non-wide sense stationary signal poses significant problems in identifying scattering centers in the post processed radar-generated image. A non-wide sense stationary RCS is typically encountered when moving parts on the target impress a phase shift into the backscatter signal that is uncorrelated to the previous return pulse. When the Fourier transform of the phase shifted complex signal is taken, range and cross range information ... |
|
| Stochastic Estimation and Control of Queues Within a Computer Network |
Mar-2009 |
99 pages |
| Authors:
Mingook Kim; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Captain Nathan C. Stuckey implemented the idea of the stochastic estimation and control for network in OPNET simulator. He used extended Kalman filter to estimate packet size and packet arrival rate of network queue to regulate queue size. To validate stochastic theory, network estimator and controller is designed by OPNET model. These models validated the transient queue behavior in OPNET and work of Kalman filter by predicting the queue size ... |
|
| UAV Swarm Mission Planning Development Using Evolutionary Algorithms and Parallel Simulation - Part II |
May-2008 |
19 pages |
| Authors:
Gary B Lamont; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The purpose of this paper is to discuss the design and implementation of comprehensive mission planning systems for swarms of autonomous aerial vehicles (UAV). Such a system could integrate several problem domains including path planning, vehicle routing, and swarm behavior as based upon a hierarchical architecture. The example developed system consists of a parallel multi-objective evolutionary algorithm-based terrain-following parallel path planner, a multi-objective evolutionary algorithm (MOEA) for the UAV swarm ... |
|
| UAV Swarm Mission Planning Development Using Evolutionary Algorithms - Part I |
May-2008 |
17 pages |
| Authors:
Gary B Lamont; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Embedding desired behaviors in autonomous vehicles is a difficult problem at best and in general probably impossible to completely resolve in complex dynamic environments. Future technology demands the deployment of small autonomous vehicles or agents with large-scale decentralized swarming capabilities and associated behaviors. Various techniques inspired by biological self-organized systems as found in forging insects and flocking birds, revolve around control approaches that have simple localized rule sets that generate ... |
|
| Cyber Flag: A Realistic Cyberspace Training Construct |
27 MAR 2008 |
134 pages |
| Authors:
Andrew P. Hansen; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| As is well understood, the rapidly unfolding challenges of cyberspace is a fundamental warfare paradigm shift revolutionizing the way future wars will be fought and won. A significant test for the Air Force (indeed any organization with a credible presence in cyberspace) will be providing a realistic training environment that fully meets this challenge. Why create another Flag level exercise? Realistic training (that which is effective, comprehensive and coordinated) is ... |
|
| Priority Based Buffering over Multiple Lossy Links Using TCP Aware Link Layer Buffering |
27 MAR 2008 |
83 pages |
| Authors:
Kevin J. Savidge; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Wireless military information systems require high reliability, which is difficult to achieve in adverse conditions. To provide high reliability one must overcome packet loss across multiple wireless hops. Buffering packets in a lossy environment is well explored; however, the ability to selectively buffer TCP traffic across multiple lossy links is a new area of research. This document seeks to explore the delivery of high priority traffic in a lossy environment ... |
|
| Collision Avoidance for UAVs Using Optic Flow Measurement With Line of Sight Rate Equalization and Looming |
01-Mar-2008 |
135 pages |
| Authors:
Paul J Shelnutt; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A series of simplified scenarios is investigated whereby an optical flow - balancing guidance law is used to avoid obstacles by steering an air vehicle between fixed objects/obstacles. These obstacles are registered as specific points that can be representative of features in a scene. The obstacles appear in the field of view of a single forward looking camera. First a 2-D analysis is presented where the rate of the line ... |
|
| Scripted Mobile Network Routing in a Contested Environment |
01-Mar-2008 |
58 pages |
| Authors:
Anthony R Otto; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Mobile wireless network protocols currently run on optimistic routing algorithms, adjusting node connectivity only when the chosen connectivity metrics, such as signal strength, pass beyond minimum thresholds. Optimistic routing has several weaknesses. Optimistic routing suffers from increased network overhead during increased frequency of node movement increased node density per area, and optimistic routing suffers from non-optimistic access change for individual nodes. The overall communication throughput of a network may be ... |
|
| Developing a Reference Framework for Cybercraft Trust Evaluation |
01-Mar-2008 |
98 pages |
| Authors:
Shannon E Hunt; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| It should be no surprise that Department of Defense (DoD) and U.S. Air Force (USAF) networks are the target of constant attack. As a result, network defense remains a high priority for cyber warriors. On the technical side, trust issues for a comprehensive end-to-end network defense solution are abundant and involve multiple layers of complexity. The Air Force Research Labs (AFRL) is currently investigating the feasibility of a holistic approach ... |
|
| Tightly-Coupled INS, GPS, and Imaging Sensors for Precision Geolocation |
01-Jan-2008 |
12 pages |
| Authors:
Mike Veth; Fred Webber; Mike Nielsen; Robert C Anderson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Recent technological advances have significantly improved the capabilities of micro-air vehicles (MAV). This is evidenced by their expanding use by government, police, and military forces. A MAV can provide a real-time surveillance capability to even the smallest units, which provides commanders with a significant advantage. This capability is a result of the availability of miniaturized autopilot systems which typically combine inertial, pitot-static, and GPS sensors into a feedback flight-control system. ... |
|
| Forensics Image Background Matching Using Scale Invariant Feature Transform (SIFT) And Speeded Up Robust Features (SURF) |
20 DEC 2007 |
60 pages |
| Authors:
II Fogg Paul N.; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In criminal investigations, it is not uncommon for investigators to obtain a photograph or image that shows a crime being committed. Additionally, thousands of pictures may exist of a location, taken from the same or varying viewpoints. Some of these images may even include a criminal suspect or witness. One mechanism to identify criminals and witnesses is to group the images found on computers, cell phones, cameras, and other electronic ... |
|
| Parallelizing Ant Colony Optimization via Area of Expertise Learning |
13 SEP 2007 |
115 pages |
| Authors:
Adrian A. de Freitas; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Ant colony optimization algorithms have long been touted as providing an effective and efficient means of generating high quality solutions to NP-hard optimization problems. Unfortunately, while the structure of the algorithm is easy to parallelize, the nature and amount of communication required for parallel execution has meant that parallel implementations developed suffer from decreased solution quality, slower runtime performance, or both. This thesis explores a new strategy for ant colony ... |
|
| Radar System Characterization Extended to Hardware-in-the-Loop Simulation for the Lab-Volt (Trademark) Training System |
SEP 2007 |
196 pages |
| Authors:
Oscar C. Mayhew; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Modeling RADAR signals in software allows the testing of potential electronic counter measures and electronic counter counter measures without the associated RADAR hardware and test facilities. Performing a characterization process on a real world RADAR system reveals all imperfections within the system. The Lab-Volt (TM) RADAR system served as the characterized real world RADAR system. The characterization process consisted of measurements at selected front panel locations on the Lab-Volt (TM) ... |
|
| Collaborative, Trust-Based Security Mechanisms for a National Utility Intranet |
SEP 2007 |
262 pages |
| Authors:
Gregory M. Coates; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This thesis investigates security mechanisms for utility control and protection networks using IP-based protocol interaction. It proposes flexible, cost-effective solutions in strategic locations to protect transitioning legacy and full IP-standards architectures. It also demonstrates how operational signatures can be defined to enact organizationally-unique standard operating procedures for zero failure in environments with varying levels of uncertainty and trust. The research evaluates layering encryption, authentication, traffic filtering, content checks, and event ... |
|
| Using Client Puzzles to Mitigate Distributed Denial of Service Attacks in the Tor Anonymous Routing Environment |
Jun-2007 |
7 pages |
| Authors:
Richard A Raines; Nicholas A Fraser; Douglas J Kelly; Rusty O Baldwin; Barry E Mullins; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A novel client puzzle protocol, the Memoryless Puzzle Protocol (MPP), is proposed and investigated. The goal is to show that MPP is a viable solution for mitigating distributed denial-of-service (DDoS) attacks in an anonymous routing environment. One such environment, Tor, provides anonymity for interactive Internet services. However, Tor relies on the Transport Layer Security (TLS) protocol, making it vulnerable to distributed denial-of-service (DDoS) attacks. Although client puzzles are often proposed ... |
|
| Bit Error Rate Minimizing Channel Shortening Equalizers for Single Carrier Cyclic Prefixed Systems |
Apr-2007 |
5 pages |
| Authors:
Richard K Martin; Koen Vanbleu; Geert Ysebaert; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Single carrier cyclic prefixed (SCCP) communications are a close relative of multicarrier communications. Both types of systems are robust to multipath, provided that the channel delay spread is shorter than the guard interval between transmitted blocks. If this condition is not met, a channel shortening equalizer can be used to shorten the channel to the desired length. Previous work on channel shortening has largely been in the context of digital ... |
|
| 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 ... |
|
| Stochastic Constraints for Fast Image Correspondence Search with Uncertain Terrain Model |
2007 |
9 pages |
| Authors:
Michael Veth; John Raquet; Meir Pachter; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The navigation state (position, velocity, and attitude) can be determined using optical measurements from an imaging sensor pointed toward the ground. Extracting navigation information from an image sequence depends on tracking the location of stationary objects in multiple images, which is generally termed the correspondence problem. This is an active area of research and many algorithms exist which attempt to solve this problem by identifying a unique feature in one ... |
|
| Correspondence Search Mitigation Using Feature Space Anti-Aliasing |
2007 |
14 pages |
| Authors:
Mike Veth; Meir Pachter; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Image-aided navigation techniques can determine the navigation solution (position, velocity, and attitude) by observing a sequence of images from an optical sensor over time. This operation is based on tracking the location of stationary objects in multiple images, which requires solving the correspondence problem. This is an active area of research and many algorithms exist which attempt to solve this problem by identifying a unique feature in one image and ... |
|
| AFIT UAV Swarm Mission Planning and Simulation System |
13 JUN 2006 |
152 pages |
| Authors:
James N. Slear; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The purpose of this research is to design and implement a comprehensive mission planning system for swarms of autonomous aerial vehicles. The system integrates several problem domains including path planning, vehicle routing, and swarm behavior. The developed system consists of a parallel, multi-objective evolutionary algorithm-based path planner, a genetic algorithm-based vehicle router, and a parallel UAV swarm simulator. Each of the system's three primary components are developed on AFIT's Beowulf ... |
|
| A Notional Battlespace for Simulating and Testing Dynamic Wireless Networks |
JUN 2006 |
87 pages |
| Authors:
David E. Stookey; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Communications are critical to many operations and functions. The US military relies on a complex mesh of communication circuits, comprised of wired and wireless links. While mobile communication is necessarily wireless, currently mobile communication occurs in a rigid structure of centrally managed, dedicated links. Future military communication will require dynamic wireless networks where more data is routed and transported in an opportunistic method in the battlespace. Researchers are exploring various ... |
|
| Toward the Static Detection of Deadlock in Java Software |
23 MAR 2006 |
119 pages |
| Authors:
Jose E. Fadul; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Concurrency is the source of many real-world software reliability and security problems. Concurrency defects are difficult to detect because they defy conventional software testing techniques due to their non-local and non-deterministic nature. We focus on one important aspect of this problem: static detection of the possibility of deadlock - a situation in which two or more processes are prevented from continuing while each waits for resources to be freed by ... |
|
| Speech Recognition Using the Mellin Transform |
MAR 2006 |
75 pages |
| Authors:
Jesse R. Hornback; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The purpose of this research was to improve performance in speech recognition. Specifically, a new approach was investigating by applying an integral transform known as the Mellin transform (MT) on the output of an auditory model to improve the recognition rate of phonemes through the scale-invariance property of the Mellin transform. Scale-invariance means that as a time-domain signal is subjected to dilations, the distribution of the signal in the MT ... |
|
| Characterization and Design of High-Level VHDL I/Q Frequency Downconverter Via Special Sampling Scheme |
MAR 2006 |
221 pages |
| Authors:
Jesse P. Somann; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This study explores the characterization and implementation of a Special Sampling Scheme (SSS) for In-Phase and Quad-Phase (I/Q) down conversion utilizing top-level, portable design strategies. The SSS is an under-developed signal sampling methodology that can be used with military and industry receiver systems, specifically, United States Air Force (USAF) video receiver systems. The SSS processes a digital input signal-stream sampled at a specified sampling frequency, and down converts it into ... |
|
| Application of Fuzzy State Aggregation and Policy Hill Climbing to Multi-Agent Systems in Stochastic Environments |
MAR 2006 |
79 pages |
| Authors:
Dean C. Wardell; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Reinforcement learning is one of the more attractive machine learning technologies, due to its unsupervised learning structure and ability to continually even as the operating environment changes. Applying this learning to multiple cooperative software agents (a multi-agent system) not only allows each individual agent to learn from its own experience, but also opens up the opportunity for the individual agents to learn from the other agents in the system, thus ... |
|
| Cryptanalysis of Pseudorandom Number Generators in Wireless Sensor Networks |
MAR 2006 |
135 pages |
| Authors:
Kevin M. Finnigin; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This work presents a brute-force attack on an elliptic curve cryptosystem implemented on UC Berkley's TinyOS operating system for wireless sensor networks. The attack exploits the short period of the pseudorandom number generator (PRNG) used by the cryptosystem to generate private keys. The attack assumes a laptop is listening promiscuously to network traffic for key messages and requires only the sensor node?s public key and network address to discover the ... |
|
| Doppler Aliasing Reduction in Wide-Angle Synthetic Aperture Radar Using Phase Modulated Random Stepped-Frequency Waveforms |
MAR 2006 |
79 pages |
| Authors:
Andrew W. Hyatt; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research investigates the benefits of using several phase modulated Random Stepped Frequency (RSF) waveforms in a Wide-Angle Synthetic Aperture Radar (WA-SAR) scenario. RSF waveforms have been demonstrated to have desirable properties which allow for cancelling of Doppler aliased scatterers in WA-SAR images. Additional aliased energy reduction is realized by improving the uniformity of the frequency coverage across the waveform?s bandwidth. Phase code modulations applied to the subpulses of a ... |
|
| Determining the Resistivity of Resistive Sheets Using Transmission Measurements |
MAR 2006 |
126 pages |
| Authors:
IV Hyde Milo W.; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In September 2005, radar cross section (RCS) measurements were made of resistive sheets, or R-cards, wrapped around a polystyrene foam cylinder to compare with a newly developed theoretical RCS prediction technique. The resistivities of the R-cards were initially measured with a direct current (DC) four-point probe. When the RCS measurements were compared to the theoretical predictions, it became clear that DC resistivity alone is not sufficient to accurately predict the ... |
|
| Microelectromechanical Systems (MEMS) Interrupter for Safe and Arm Devices |
MAR 2006 |
196 pages |
| Authors:
Steven S. Mink; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This thesis addresses the development of a new micro-scale interrupter mechanism for a safe and arm device used in modern weapon systems. The interrupter mechanism often consists of a physical barrier that prevents an initial source of energy, in an explosive train, from being transferred to subsequent charges. In general, when the physical barrier is removed, the weapon is considered armed, and the charge is allowed to propagate. Several issues ... |
|
| Bio-Inspired, Odor-Based Navigation |
MAR 2006 |
185 pages |
| Authors:
III Porter Maynard J.; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The ability of moths to locate a member of the opposite sex, by tracking a wind-borne plume of odor molecules, is an amazing reality. Numerous scenarios exist where having this capability embedded into ground-based or aerial vehicles would be invaluable. The main crux of this thesis investigation is the development of a navigation algorithm which gives a UAV the ability to track a chemical plume to its source. Inspiration from ... |
|
| Design and Characterization of a Radiation Tolerant Triple Mode Redundant Sense Amplifier Flip-Flop for Space Applications |
MAR 2006 |
151 pages |
| Authors:
Mark E. Martin; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| One of the more recently proposed flip-flop designs has been the sense amplifier flip-flop. It has gained acceptance in the commercial realm because of its power consumption, speed, setup time, clock line loading, and data line loading characteristics. In this thesis, a recently designed RADHARD version of D sense amplifier flip-flop was taken and a triple mode redundant version for space and radiation environment use was created. The design was ... |
|
| Development of a Comprehensive Digital Avionics Curriculum for the Aeronautical Engineer |
MAR 2006 |
181 pages |
| Authors:
Thomas W. Hofer; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The purpose of this research was to develop a comprehensive digital avionics curriculum for aeronautical engineering students at AFIT. Due to the closing of the aeronautical engineering program at the Naval Postgraduate School, and the subsequent requirement to establish a digital avionics specialty course sequence at AFIT, a mature avionics curriculum does not yet exist that satisfies the needs of graduates who will serve as aeronautical engineers involved with the ... |
|
| Finite Difference Time Domain (FDTD) Analysis of a Leaky Traveling Wave Microstrip Antenna |
21 MAR 2005 |
158 pages |
| Authors:
Gregory M. Zelinski; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This thesis provides the groundwork that will enable the development of a lightweight, inexpensive, aerodynamic, and broadband antenna. Whether for radar or communication, an antenna with these properties would be a force multiplier for the smaller, limited payload air vehicles the United States Air Force will pursue in the coming years. Several microstrip antennas using the first higher order mode were simulated with the Finite-Difference Time-Domain (FDTD) method. The propagation ... |
|
| Deconvolution Analysis of Laser Pulse Profiles from 3-D LADAR Temporal Returns |
21 MAR 2005 |
71 pages |
| Authors:
Michael D. Walter; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Three-dimensional laser imaging systems offer important advantages for battlefield applications, such as night-time targeting and tactical reconnaissance. Recently developed technologies used by coherent detection systems that collect temporally resolved images include arrays of Avalanche Photo-Diodes (APD), Geiger mode APDs, and photo-diodes. Frequently, LADAR systems produce waveforms from each detector that characterize the convolution of the transmitted laser pulse with the target surface. The pulse convolution generates uncertainty as to the ... |
|
| Assessing Information Trustability in a Secure Web Services Environment |
21 MAR 2005 |
82 pages |
| Authors:
Charles G. Penner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Decisions are made based on available information. A decision support system endeavors to provide information that is timely, accurate, and trustable. Information gathered from secure web service transactions has attributes that can be used to assess a level of trustability. The trust assessments enable a decision maker to determine a basis for confidence in the information presented from the web service. Existing trust assessment models do not provide a way ... |
|
| Tensile Stress Rupture Behavior of a Woven Ceramic Matrix Composite in Humid Environments at Intermediate Temperature |
MAR 2005 |
208 pages |
| Authors:
Kevin J. LaRochelle; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Stress rupture tests on the Sylramic(TM) fiber with an in-situ layer of boron nitride, boron nitride interphase, and SiC matrix ceramic matrix composite were performed at 550 degrees C and 750 degrees C with 0.0, 0.2, or 0. 6 atm partial pressure of water vapor, pH(sub 2)O. The 550 degrees C, 100-hr strengths were 75%, 65% and 51% of the monotonic room temperature tensile strength, respectively. At 750 degrees C, ... |
|
| A Genetic Algorithm for UAV Routing Integrated with a Parallel Swarm Simulation |
MAR 2005 |
240 pages |
| Authors:
Matthew A. Russell; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research investigation addresses the problem of routing and simulating swarms of UAVs. Sorties are modeled as instantiations of the NP- Complete Vehicle Routing Problem, and this work uses genetic algorithms (GAs) to provide a fast and robust algorithm for a priori and dynamic routing applications. Swarms of UAVs are modeled based on extensions of Reynolds' swarm research and are simulated on a Beowulf cluster as a parallel computing application ... |
|
| Real-Time Mapping Using Stereoscopic Vision Optimization |
MAR 2005 |
99 pages |
| Authors:
Kevin M. Biggs; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research focuses on efficient methods of generating 2D maps from stereo vision in real-time. Instead of attempting to locate edges between objects, we make the assumption that the representative surfaces of objects in a view provide enough information to generate a map while taking less time to locate during processing. Since all real-time vision processing endeavors are extremely computationally intensive, numerous optimization techniques are applied to allow for a ... |
|
| Nonlinear Wavelet Transforms for Image Coding via Lifting |
Dec-2003 |
12 pages |
| Authors:
Wim Sweldens; Richard G Baraniuk; Claypoole; Roger L Jr; Geoffrey M Davis; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We investigate central issues such as invertibility, stability, synchronization, and frequency characteristics for nonlinear wavelet transforms built using the lifting framework. The nonlinearity comes from adaptively choosing between a class of linear predictors within the lifting framework. We also describe how earlier families of nonlinear filter banks can be extended through the use of prediction functions operating on a causal neighborhood of pixels. Preliminary compression results for model and real-world ... |
|
| Determining When to Use an Agent-Oriented Software Engineering Paradigm |
29 MAY 2001 |
19 pages |
| Authors:
Scott A. O'Malley; Scott A. DeLoach; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| With the emergence of agent-oriented software engineering techniques, software engineers have a new way of conceptualizing complex distributed software requirements. To help determine the most appropriate software engineering methodology, a set of defining criteria is required. This paper describes out an approach to determing these crtieria , as well as a technique to assist software engineers with the selection of a software engineering methodology based on those criteria. |
|
| Comparing Performance of Static Versus Mobile Multiagent Systems |
12 OCT 2000 |
9 pages |
| Authors:
Scott A. O'Malley; Athie L. Self; Scott A. DeLoach; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This paper analyzes the performance differences between static and mobile multiagent systens. To do so we developed solutions to a distributed text search problems each using a different approach to multiagent systems (static versus mobile) on an isolated test network. Changes were then made to the agent environment various constmints applied and the resulting effect on the systenm measured Each system was evaluated using a number of perfomance metrics to ... |
|
| Heterogeneous Database Integration Using Agent-Oriented Information Systems |
2000 |
8 pages |
| Authors:
J. Todd McDonald; Michael L. Talbert; Scott A. DeLoach; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Department of Defense (DOD) has an extensive family of models used to simulate the mission level interaction of weapon systems. Interoperability and reuse of the underlying data files used to create simulation scenarios pose great challenges in this regard. Unlike traditional data integration methods common to federated database research, the emerging field of agent-oriented information systems (AOIS) views data as the central focus of an application while also providing ... |
|
| Automatic Verification of Multiagent Conversations |
2000 |
9 pages |
| Authors:
Timothy Lacey; Scott A. DeLoach; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| As network bandwidth increases, distributed applications are becoming increasingly prevalent. Systems using these applications are very complicated to build and must be dependable. Software agents are ideal for breaking complicated problems into manageable subtasks. Agent conversations, a series of messages passed between agents, are the cornerstone of multiagent systems and must be deemed correct before being placed into service. This paper introduces a method to automatically verify that conversations are ... |
|
Reports by Corporate Author
