Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"unmanned systems"”.
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Business case assessment of unmanned systems level of autonomy
… has continually increased its spending on unmanned aerial vehicles (UAVs) during the past decade. Efforts to drive down UAV costs have primarily focused on the physical characteristics of the UAV, such as weight, size, and shape. Due to the saturation of the UAV business in the federal …
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Development of a System Architecture for Unmanned Systems Across Multiple Domains
<p>In the unmanned systems industry, there is no common standard for systems components, connections and relations. Such a standard is never likely to exist. Needless to say, a system needs to have the components that are required for the application, however, it is possible to abstract the common …
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A new guidance trajectory generation algorithm for unmanned systems incorporating vehicle dynamics and constraints
… algorithm for autonomous guidance and control of unmanned vehicles from a given starting point to a given target location. We build and update incomplete a priori maps of the operating environment in real time using onboard sensors and compute level sets on the map reflecting the minimal cost of …
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Quantitative Analysis of Non-Linear Probabilistic State Estimation Filters for Deployment on Dynamic Unmanned Systems
… state estimation algorithms with focus towards unmanned system positioning and three-dimensional (3D) mapping. State estimation algorithms are considered an influential aspect of any dynamic system with autonomous capabilities. Possessing the ability to predictively estimate future conditions …
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Assessment of genetic algorithm based assignment strategies for unmanned systems using the multiple traveling salesman problem with moving targets
… continuous and rapid advancements in autonomous unmanned systems technologies presents increasingly sophisticated threats to military operations. These threats necessitate the prioritization of improved strategies for military resources and air base defense. In many scenarios, it is necessary to …
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Design and Evaluation of a Mobile Instrumentation Platform for Unmanned Vehicle Testing
Unmanned vehicle systems are becoming more important in the future of the military and in commercial applications. These systems are used to prevent humans from entering dangerous situations or to automate dull tasks. In order to facilitate rapid development of these systems, testing procedures and …
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Stereo Vision Based Aerial Mapping Using GPS and Inertial Sensors
… field has grown in recent years to a point where unmanned systems are no longer limited by their capabilities. As such, the mission profiles for unmanned systems are becoming more and more complicated, and a demand has risen for the deployment of unmanned systems into the most complex of …
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A JAUS Toolkit for LabVIEW, and a Series of Implementation Case Studies with Recommendations to the SAE AS-4 Standards Committee
The Joint Architecture for Unmanned Systems (JAUS) is an emerging SAE standard for messaging between and within unmanned systems, enhancing interoperability, code reusability, and modularity. To date, most JAUS implementations have been produced by developers in the JAUS Working Group, who have an …
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Development of a Next-generation Experimental Robotic Vehicle (NERV) that Supports Intelligent and Autonomous Systems Research
… tasks. As a result, the demand for practical unmanned ground vehicle (UGV) systems has increased dramatically in recent years. Central to these developments is maturation of emerging mobile robotic intelligent and autonomous capability. While the progress UGV technology has been substantial, …
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Development of the "Discretized Dynamic Expanding Zones with Memory" Autonomous Mobility Algorithm for the Nemesis Tracked Vehicle Platform
… of Virginia Tech's JAUS (Joint Architecture for Unmanned Systems) toolkit, and a modified version of the Dynamic Expanding Zones (DEZ) algorithm developed for the 2005 DARPA Grand Challenge. The modified approach discretizes the perception zones of the DEZ algorithm and provides the added …
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Development of an FPGA Based Autopilot Hardware Platform for Research and Development of Autonomous Systems
Unmanned vehicles, both ground and aerial, have become prevalent in recent years. The research community has different needs than the industrial community when designing a finalized unmanned system since the vehicle, the sensors and the control design are dynamic and change frequently as new ideas …
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Design and Development of Low-cost Multi-function UAV Suitable for Production and Operation in Low Resource Environments
… new flying wing design has been developed at the Unmanned Systems Lab (USL) at Virginia Tech to serve delivery and remote sensing applications in the developing world. The fully autonomous unmanned aerial vehicle (UAV), named EcoSoar, was designed with the goal of creating a business opportunity …
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Development of an Automotive Ground Vehicle Platform for Autonomous Urban Operations
… system that is highly integrated with the OEM systems, providing throttle, steering, shifting, and braking actuation. The vehicle also includes a controller that provides low-level longitudinal using a map-linearized PI controller and lateral curvature control using a bicycle model. The control …
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Pseudo Doppler Direction Finding System for Localizing Non-Cooperative VHF Transmitters with a Hybrid UAS
… specific applications. Commercial off the shelf systems exist for a wide range of applications from navigation to search and rescue and wildlife tracking. However these systems rely on commercially available VHF receivers and are limited in transmission modulation techniques and frequency ranges. …
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BOLTZMANN ENTROPY FOR UNDERSEA TERRAIN AIDED NAVIGATION
… navigate accurately without Global Positioning Systems (GPS) or beacon systems remains an elusive yet important capability for unmanned systems. Reliance on external beacon systems, like GPS and long baseline, create system vulnerabilities if those beacon systems are damaged or removed. This …
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Autonomous adaptation and collaboration of unmanned vehicles for tracking submerged contacts
… operations are vital to future naval operations. Unmanned systems, including autonomous underwater vehicles (AUVs) and autonomous surface vehicles (ASVs), are anticipated to play a key role for critical tasks such as mine countermeasures (MCM) and anti-submarine warfare (ASW). Addressing these …
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A Portable Approach to High-Level Behavioral Programming for Complex Autonomous Robot Applications
Research in mobile robotics, unmanned systems, and autonomous man-portable vehicles has grown rapidly over the last decade. This push has taken the problems of robot cognition and behavioral control out of the lab and into the field. Two good examples of this are the DARPA Urban Challenge …
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A systems engineering analysis of unmanned maritime systems for U.S. Coast Guard missions
… is uniquely suited to utilize multi-mission unmanned maritime systems (UMS) to maintain its leading role in maritime safety, security and stewardship. Current UMS technological capabilities coupled with USCG mission needs motivate an analysis of proposed USCG UMS through a systems engineering …
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An Underwater Vehicle Navigation System Using Acoustic and Inertial Sensors
<p>Unmanned Underwater Vehicles (UUVs) have become an essential tool for different underwater tasks. Compared with other unmanned systems, the navigation and localization for UUVs are particularly challenging due to the unavailability of Global Positioning System (GPS) signals underwater and the …
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Design of a Teleoperated Rock Sampling System
… manipulator arm will be used in conjunction with systems developed by the Unmanned Systems Laboratory at Virginia Tech. This group is developing a unmanned ground vehicle to be carried in the payload pod of a unmanned aerial vehicle. The robot's ultimate objective is to collect shrapnel and bomb …
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