Now showing items 21-40 of 50

    • 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 ...
    • 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 ...
    • Vision-Aided Inertial Navigation for Flight Control 

      Wu, Allen D.; Johnson, Eric N.; Proctor, Alison A. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2005-09)
      Many onboard navigation systems use the Global Positioning System to bound the errors that result from integrating inertial sensors over time. Global Positioning System information, however, is not always accessible since ...
    • Adaptive Guidance and Control for Hypersonic Vehicles 

      Johnson, Eric N.; Calise, Anthony J.; Curry, Michael D. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-05)
      Guidance and control technology is recognized as an important aspect of the military, civil, and commercial goal of reliable, low-cost, aircraft-type operations into space. Here, several guidance and control methods ...
    • A Compact Guidance, Navigation, and Control System for Unmanned Aerial Vehicles 

      Christophersen, Henrik B.; Pickell, R. Wayne; Neidhoefer, James C.; Koller, Adrian A.; Kannan, Suresh K.; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-05)
      The Flight Control System 20 (FCS20) is a compact, self-contained Guidance, Navigation, and Control system that has recently been developed to enable advanced autonomous behavior in a wide range of Unmanned Aerial Vehicles ...
    • Modeling, Control, and Flight Testing of a Small Ducted Fan Aircraft 

      Johnson, Eric N.; Turbe, Michael A. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-07)
      Small ducted fan autonomous vehicles have potential for several applications, especially for missions in urban environments. This paper discusses the use of dynamic inversion with neural network adaptation to provide an ...
    • 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 ...
    • Neural Network Augmented Kalman Filtering in the Presence of Unknown System Inputs 

      Sattigeri, Ramachandra J.; Calise, Anthony J. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2006-08)
      We present an approach for augmenting a linear, time-varying Kalman filter with an adaptive neural network (NN) for the state estimation of systems with linear process models acted upon by unknown inputs. The application ...
    • 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 ...
    • 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 ...
    • Real-Time Vision-Based Relative Aircraft Navigation 

      Johnson, Eric N.; Calise, Anthony J.; Watanabe, Yoko; Ha, Jin-Cheol; Neidhoefer, James C. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2007-03)
      This paper describes two vision-based techniques for the navigation of an aircraft relative to an airborne target using only information from a single camera fixed to the aircraft. These techniques are motivated by ...
    • Adaptive Output Feedback Control of a Flexible Base Manipulator 

      Yang, Bong-Jun; Calise, Anthony J.; Craig, James I. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2007-07)
      This paper considers augmentation of an existing inertial damping mechanism by neural network-based adaptive control, for controlling a micromanipulator that is serially attached to a macromanipulator. The approach ...
    • 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 ...
    • Integration of Adaptive Estimation and Adaptive Control Design for Uncertain Nonlinear Systems 

      Sattigeri, Ramachandra J.; Calise, Anthony J.; Kim, Byoung Soo (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2007-08)
      This paper presents a method to integrate adaptive estimation and adaptive control designs for a class of uncertain nonlinear systems having both parametric uncertainties and unmodeled dynamics. The method is based on ...
    • Vision-based Target Tracking with Adaptive Target State Estimator 

      Sattigeri, Ramachandra J.; Johnson, Eric N.; Calise, Anthony J.; Ha, Jin-Cheol (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2007-08)
      This paper presents an approach to vision-based target tracking with a neural network (NN) augmented Kalman filter as the adaptive target state estimator. The vision sensor onboard the follower (tracker) aircraft is a ...
    • 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 ...
    • 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., 2007-10)
      This paper presents an integrated guidance and control design for formation flight using a combination of adaptive output feedback and backstepping techniques. We formulate the problem as an adaptive output feedback ...
    • Flight-Test Results of Autonomous Airplane Transitions Between Steady-Level and Hovering Flight 

      Johnson, Eric N.; Wu, Allen D.; Neidhoefer, James C.; Kannan, Suresh K.; Turbe, Michael A. (Georgia Institute of Technology, 2008-03)
      Linear systems can be used to adequately model and control an aircraft in either ideal steady-level flight or in ideal hovering flight. However, constructing a single unified system capable of adequately modeling or ...
    • 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 ...
    • UAS Reference Scenarios for MANET Development 

      Christmann, Hans Claus; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2008-08)
      After autonomous flight for Unmanned Aerial Vehicles (UAVs) has been accomplished, research was stipulated to look into application related challenges in connection with Unmanned Aerial Systems (UAS). As one possible ...