Now showing items 1-20 of 33

    • 3D Obstacle Detection Using a Single Camera 

      Shah, Syed Irtiza Ali; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2009-08)
      This paper aims at detecting obstacles using a single camera in an unknown three dimensional world, for 3D motion of an unmanned air vehicle. Obstacle detection is a pre-requisite for collision-free motion of a UAV through ...
    • 6-DOF Nonlinear Simulation of Vision-based Formation Flight 

      Sattigeri, Ramachandra J.; Calise, Anthony J.; Kim, Byoung Soo; Volyanskyy, Konstantin; Kim, Nakwan (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2005-08)
      This paper presents an adaptive guidance and control law algorithm for implementation on a pair of Unmanned Aerial Vehicles (UAVs) in a 6 DOF leader-follower formation flight simulation. The objective of the simulation ...
    • An Adaptive Approach to Vision-based Formation Control 

      Sattigeri, Ramachandra J.; Calise, Anthony J.; Evers, Johnny H. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2003-08)
      In considering the problem of formation control in the deployment of intelligent munitions, it would be highly desirable, both from a mission and a cost perspective, to limit the information that is transmitted between ...
    • Adaptive Control for a Microgravity Vibration Isolation System 

      Yang, Bong-Jun; Calise, Anthony J.; Craig, James I.; Whorton, Mark S. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2005-08)
      Most active vibration isolation systems that try to a provide quiescent acceleration environment for space-science experiments have utilized linear design methods. In this paper, we address adaptive control augmentation ...
    • Adaptive Control of Evolving Gossamer Structures 

      Yang, Bong-Jun; Calise, Anthony J.; Craig, James I.; Whorton, Mark S. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-08)
      A solar sail is an example of a gossamer structure that is proposed as an propulsion system for future space missions. Since it is a large scale flexible structure that requires a long time for its deployment, active ...
    • Adaptive Neural Network Flight Control Using both Current and Recorded Data 

      Chowdhary, Girish; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2007-08)
      Modern aerospace vehicles are expected to perform beyond their conventional flight envelopes and exhibit the robustness and adaptability to operate in uncertain environments. Augmenting proven lower level control algorithms ...
    • Adaptive output feedback control with input saturation 

      Yang, Bong-Jun; Calise, Anthony J.; Craig, James I. (Georgia Institute of TechnologyIEEE, 2003-06)
      We consider the problem of adaptive output feedback control in the presence of saturating input characteristic. The adaptive control architecture augments an existing linear control design. The approach is applicable to ...
    • An Adaptive Vision-based Approach to Decentralized Formation Control 

      Sattigeri, Ramachandra J.; Calise, Anthony J.; Evers, Johnny H. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2004-08)
      In considering the problem of formation control in the deployment of intelligent munitions, it would be highly desirable, both from a mission and a cost perspective, to limit the information that is transmitted between ...
    • Adaptive, Integrated Guidance and Control Design for Line-of-Sight based Formation Flight 

      Kim, Byoung Soo; Calise, Anthony J.; Sattigeri, Ramachandra J. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-08)
      This paper presents an integrated guidance and control design for formation flight using a combination of adaptive output feedback and backstepping techniques without an underlying time-scale separation assumption. We ...
    • Approaches to Vision-Based Formation Control 

      Johnson, Eric N.; Calise, Anthony J.; Sattigeri, Ramachandra J.; Watanabe, Yoko; Madyastha, Venkatesh (Georgia Institute of TechnologyIEEE, 2004-12)
      This paper implements several methods for performing vision-based formation flight control of multiple aircraft in the presence of obstacles. No information is communicated between aircraft, and only passive 2-D ...
    • Coordinated Decentralized Adaptive Output Feedback Control of Interconnected Systems 

      Hovakimyan, Naira; Lavretsky, Eugene; Yang, Bong-Jun; Calise, Anthony J. (Georgia Institute of TechnologyAmerican Automatic Control Council, 2004-06)
      A decentralized adaptive output feedback control design is proposed for large-scale interconnected systems. It is assumed that all the controllers share prior information about the system reference models. A linearly ...
    • Design and Implementation of a Self-configuring Ad-hoc Network for Unmanned Aerial Systems 

      Christmann, Hans Claus; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2007-10)
      Unmanned aerial vehicles (UAVs), and unmanned aerial systems (UAS) as such in general, need wireless networks in order to communicate. UAS are very flexible and hence allow for a wide range of missions by means of utilizing ...
    • Development of an Autonomous Aerial Reconnaissance System at Georgia Tech 

      Proctor, Alison A.; Kannan, Suresh K.; Raabe, Chris; Christophersen, Henrik B.; Johnson, Eric N. (Georgia Institute of Technology, 2003-07)
      The Georgia Tech aerial robotics team has developed a system to compete in the International Aerial Robotics Competition, organized by the Association for Unmanned Vehicle Systems, International. The team is a multi-disciplinary ...
    • Estimation and Guidance Strategies for Vision-based Target Tracking 

      Calise, Anthony J.; Johnson, Eric N.; Sattigeri, Ramachandra J.; Watanabe, Yoko; Madyastha, Venkatesh (Georgia Institute of TechnologyAACC, 2005-06)
      This paper discusses estimation and guidance strategies for vision-based target tracking. Specific applications include formation control of multiple unmanned aerial vehicles (UAVs) and air-to-air refueling. We assume that ...
    • Experimental Validation of an Augmenting Approach to Adaptive Control of Uncertain Nonlinear Systems 

      Yang, Bong-Jun; Hovakimyan, Naira; Calise, Anthony J.; Craig, James I. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2003-08)
      A method of adaptive output feedback design for uncertain nonlinear systems is presented. The development is in a form that is suitable for augmenting a linear controller. The approach is applicable to non-affine, non-minimum ...
    • Flight Results of Autonomous Fixed-Wing UAV Transitions to and from Stationary Hover 

      Johnson, Eric N.; Turbe, Michael A.; Wu, Allen D.; Kannan, Suresh K.; Neidhoefer, James C. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-08)
      Fixed-wing unmanned aerial vehicles (UAVs) with the ability to hover have significant potential for applications in urban or other constrained environments where the combination of fast speed, endurance, and stable ...
    • Flight Test Validation of a Neural Network based Long Term Learning Adaptive Flight Controller 

      Chowdhary, Girish; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2009-08)
      The purpose of this paper is to present and analyze flight test results of a Long Term Learning Adaptive Flight Controller implemented on a rotorcraft and a fixed wing Unmanned Aerial Vehicle. The adaptive control ...
    • Georgia Tech Aerial Robotics Team: 2009 International Aerial Robotics Competition Entry 

      Chowdhary, Girish; Christmann, Hans Claus; Johnson, Eric N.; Salaün, Erwan; Sobers, D. Michael Jr. (Georgia Institute of Technology, 2009-07)
      This paper examines the use of low-cost range and target identification sensors on a stable flying vehicle for suitability in solving the 5th Mission proposed for the 2009 International Aerial Robotics Competition. The ...
    • Guidance, Navigation, Control, and Operator Interfaces for Small Rapid Response Unmanned Helicopters 

      Christmann, Hans Claus; Christophersen, Henrik B.; Wu, Allen D.; Johnson, Eric N. (Georgia Institute of Technology, 2008-04)
      This paper focuses on the development of small rapid response reconnaissance unmanned helicopters (1 to 3 kg, electric), for use by the military in urban areas and by civilian first responders, in terms of system ...
    • Indoor Navigation for Unmanned Aerial Vehicles 

      Sobers, D. Michael Jr.; Chowdhary, Girish; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2009-08)
      The ability for vehicles to navigate unknown environments is critical for autonomous operation. Mapping of a vehicle's environment and self-localization within that environ- ment are especially difficult for an Unmanned ...