Now showing items 83-99 of 99

    • Self-Contained Autonomous Indoor Flight with Ranging Sensor Navigation 

      Chowdhary, Girish; Sobers, D. Michael, Jr.; Pravitra, Chintasid; Christmann, Hans Claus; Wu, Allen; Hashimoto, Hiroyuki; Ong, Chester; Kalghatgi, Roshan; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, 2012-11)
      This paper describes the design and flight test of a completely self-contained autonomous indoor Miniature Unmanned Aerial System (M-UAS). Guidance, navigation, and control algorithms are presented, enabling the M-UAS ...
    • A Simulation Engine to Predict Multi-Agent Work in Complex, Dynamic, Heterogeneous Systems 

      Pritchett, Amy R.; Christmann, Hans Claus; Bigelow, Matthew S. (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2011-02)
      This paper documents a simulation engine developed to accurately and efficiently simulate work by multiple agents in complex dynamic systems. Agents (human or mechanical) are modeled as responding to, and ...
    • Simultaneous Position and Attitude Control Without Linear and Angular Velocity Feedback Using Dual Quaternions 

      Filipe, Nuno; Tsiotras, Panagiotis (Georgia Institute of Technology, 2013-06)
      In this paper, we suggest a new representation for the combined translational and rotational dynamic equations of motion of a rigid body in terms of dual quaternions. We show that with this representation it is relatively ...
    • Situational and Terrain Awareness and Warning System Implementation on Android Smartphone for Manned Aviation Applications 

      Bershadsky, Dmitry; Dressel, Louis; Johnson, Eric N. (Georgia Institute of Technology, 2014-01)
      General aviation (GA) aircraft are for the most part not equipped with situational awareness or alerting systems, namely in terms of traffic or terrain collision. This is largely due to lack of regulatory requirements, but ...
    • Small Adaptive Flight Control Systems for UAVs Using FPGA/DSP Technology 

      Christophersen, Henrik B.; Pickell, Wayne J.; Koller, Adrian A.; Kannan, Suresh K.; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2004-09)
      Future small UAVs will require enhanced capabilities like seeing and avoiding obstacles, tolerating unpredicted flight conditions, interfacing with payload sensors, tracking moving targets, and cooperating with other ...
    • Speed Profile Optimization for Optimal Path Tracking 

      Zhao, Yiming; Tsiotra, Panagiotis (Georgia Institute of TechnologyInstitute of Electrical and Electronics Engineers, 2013-06)
      In this paper, we study the problem of minimum- time, and minimum-energy speed profile optimization along a given path, which is a key step for solving the optimal path tracking problems for a particular class of dynamical ...
    • Speed Profile Optimization for Optimal Path Tracking 

      Zhao, Yiming; Tsiotras, Panagiotis (Georgia Institute of Technology, 2013-11)
      In this paper, we study the problem of minimum-time, and minimum-energy speed profile optimization along a given path, which is a key step for solving the optimal path tracking problems for a particular class of dynamical ...
    • System Integration and Operation of a Research Unmanned Aerial Vehicle 

      Johnson, Eric N.; Schrage, Daniel P. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, 2004-01)
      The use of flight simulation tools to reduce the schedule, risk, and required amount of flight-testing for complex aerospace systems is a well-recognized benefit of these approaches. However, some special challenges arise ...
    • Terrain Height Evidence Sharing for Collaborative Autonomous Rotorcraft Operation 

      Johnson, Eric N.; Mooney, John G.; White, Matthew; Hartman, Jonathan; Sahasrabudhe, Vineet (Georgia Institute of Technology, 2013-01)
      This paper describes recent results from a partnership between the Sikorsky Aircraft Corporation and the Georgia Institute of Technology to develop, improve, and flight test a sensor, guidance, navigation, control, and ...
    • Time-Optimal Vehicle Posture Control to Mitigate Unavoidable Collisions Using Conventional Control Inputs 

      Chakraborty, Imon; Tsiotras, Panagiotis; Sanz-Diaz, Ricardo (Georgia Institute of Technology, 2013-06)
      This paper analyzes the mitigation of an unavoidable T-bone collision, where an “intelligent” vehicle executes an aggressive time-optimal rotation to achieve a favorable relative orientation with another vehicle prior to ...
    • 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 ...
    • Use of relaxation methods in sampling-based algorithms for optimal motion planning 

      Arslan, Oktay; Tsiotras, Panagiotis (Georgia Institute of Technology, 2013-05)
      everal variants of incremental sampling-based algorithms have been recently proposed in order to optimally solve motion planning problems. Popular examples include the RRT* and the PRM* algorithms. These algorithms are ...
    • Visibility Cues for Communication Aware Guidance in Cluttered Environments 

      Christmann, Hans Claus; Johnson, Eric N. (Georgia Institute of TechnologySpringer Berlin Heidelberg, 2011)
      This paper presents the usage of visibility based guidance cues in order to find waypoints useful for maintaining communication in a multi UAV (Uninhabited Aerial Vehicle), single operator system. Based upon the overlay ...
    • 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 ...
    • Vision-Only Aircraft Flight Control 

      De Wagter, Christophe; Proctor, Alison A.; Johnson, Eric N. (Georgia Institute of Technology, 2003-10)
      Building aircraft with navigation and control systems that can complete flight tasks is complex, and often involves integrating information from multiple sensors to estimate the state of the vehicle. This paper describes ...
    • Visual Marker Detection In The Presence Of Colored Noise for Unmanned Aerial Vehicles 

      Shah, Syed Irtiza Ali; Wu, Allen D.; Johnson, Eric N. (Georgia Institute of TechnologyAmerican Institute of Aeronautics and Astronautics, Inc., 2010-04)
      This paper develops a vision-based algorithm to detect a visual marker in real time and in the presence of excessive colored noise for Unmanned Aerial Vehicles. After using various image analysis techniques, including ...
    • The Zermelo-Voronoi Diagram: a Dynamic Partition Problem 

      Bakolas, Efstathios; Tsiotras, Panagiotis (Georgia Institute of TechnologyElsevier, 2010)
      We consider a Voronoi-like partition problem in the plane for a given finite set of generators. Each element in this partition is uniquely associated with a particular generator in the following sense: An agent that resides ...