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2015
1 Citation (Scopus)

Light-weight quadrotor with on-board absolute vision-aided navigation

Magree, D. P., Van Dalen, G. J. J., Haviland, S. & Johnson, E., Jan 1 2015, 2015 International Conference on Unmanned Aircraft Systems, ICUAS 2015. Institute of Electrical and Electronics Engineers Inc., p. 1158-1167 10 p. 7152408

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Navigation
Extended Kalman filters
Sensors
Sonar
Cameras
2 Citations (Scopus)

Longitudinal motion planning for slung-loads using simplified models and rapidly-exploring random trees

Johnson, E. & Mooney, J. G., Jan 1 2015, American Helicopter Society International - 6th AHS International Specialists' Meeting on Unmanned Rotorcraft System 2015: Platform Design, Autonomy, Operator Workload Reduction and Network Centric Operations. American Helicopter Society International, p. 128-138 11 p. (American Helicopter Society International - 6th AHS International Specialists' Meeting on Unmanned Rotorcraft System 2015: Platform Design, Autonomy, Operator Workload Reduction and Network Centric Operations).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Slings
Motion planning
Helicopters
Trajectories
Sampling

Optionally piloted rotorcraft guidance and operator interface for shipboard operations

Johnson, E. & Jones, P., Jan 1 2015, American Helicopter Society International - 6th AHS International Specialists' Meeting on Unmanned Rotorcraft System 2015: Platform Design, Autonomy, Operator Workload Reduction and Network Centric Operations. American Helicopter Society International, p. 175-180 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Takeoff
Landing
Helicopters
Ships
Navigation
2014
5 Citations (Scopus)

A comparison of automatic nap-of-the-earth guidance strategies for helicopters

Johnson, E. N. & Mooney, J. G., Jan 1 2014, In : Journal of Field Robotics. 31, 4, p. 637-653 17 p.

Research output: Contribution to journalArticle

Collision avoidance
Helicopters
Earth (planet)
Aircraft
Flight paths
6 Citations (Scopus)

A comprehensive matrix of unmanned aerial systems requirements for potential applications within a department of transportation

Karan, E. P., Christmann, C., Gheisari, M., Irizarry, J. & Johnson, E., Jan 1 2014, Construction Research Congress 2014: Construction in a Global Network - Proceedings of the 2014 Construction Research Congress. American Society of Civil Engineers (ASCE), p. 964-973 10 p. (Construction Research Congress 2014: Construction in a Global Network - Proceedings of the 2014 Construction Research Congress).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Antennas
Roadsides
Specifications
Monitoring
1 Citation (Scopus)
Robots
Color
Light emitting diodes
Unmanned vehicles
Image analysis
1 Citation (Scopus)

Benchmarking of UAV guidance systems in nap of the earth (NOE) flight

Johnson, E. & Bershadsky, D., Jan 1 2014, 70th American Helicopter Society International Annual Forum 2014. American Helicopter Society, p. 1056-1061 6 p. (Annual Forum Proceedings - AHS International; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Benchmarking
Unmanned aerial vehicles (UAV)
Earth (planet)
Aircraft
Observability
2 Citations (Scopus)

Bounded hybrid connectivity control of networked multiagent systems

De La Torre, G., Yucelen, T. & Johnson, E., Sep 2014, In : IEEE Transactions on Automatic Control. 59, 9, p. 2480-2485 6 p., 6728662.

Research output: Contribution to journalArticle

Multi agent systems
1 Citation (Scopus)

Collaborative search and pursuit for autonomous helicopters

Johnson, E. & Mooney, J. G., Jan 1 2014, 70th American Helicopter Society International Annual Forum 2014. American Helicopter Society, p. 2638-2646 9 p. (Annual Forum Proceedings - AHS International; vol. 4).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Helicopters
Avionics
Decision making
Aircraft
6 Citations (Scopus)

Combined laser and vision-aided inertial navigation for an indoor unmanned aerial vehicle

Magree, D. & Johnson, E., Jan 1 2014, 2014 American Control Conference, ACC 2014. Institute of Electrical and Electronics Engineers Inc., p. 1900-1905 6 p. 6858995. (Proceedings of the American Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Unmanned aerial vehicles (UAV)
Navigation
Lasers
Inertial navigation systems
Navigation systems
56 Citations (Scopus)

Exponential parameter and tracking error convergence guarantees for adaptive controllers without persistency of excitation

Chowdhary, G., Mühlegg, M. & Johnson, E., Aug 3 2014, In : International Journal of Control. 87, 8, p. 1583-1603 21 p.

Research output: Contribution to journalArticle

Model reference adaptive control
Neural networks
Fixed wings
Controllers
Unmanned aerial vehicles (UAV)
2 Citations (Scopus)

Frequency-limited adaptive control of a generic transport model in the presence of system uncertainty and losses in control effectiveness

De La Torre, G., Yucelen, T., Haddad, W. M. & Johnson, E. N., Feb 28 2014, AIAA Guidance, Navigation, and Control Conference. (AIAA Guidance, Navigation, and Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Aircraft models
Closed loop control systems
Adaptive control systems
Transport aircraft
Control surfaces
2 Citations (Scopus)

Guidance for slung load operations through Differential Dynamic Programming

De La Torre, G., Johnson, E. N. & Theodorou, E., Jan 1 2014, 70th American Helicopter Society International Annual Forum 2014. American Helicopter Society, p. 3111-3121 11 p. (Annual Forum Proceedings - AHS International; vol. 4).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Slings
Dynamic programming
Navigation systems
Loads (forces)
Navigation
40 Citations (Scopus)

Improving transient performance of adaptive control architectures using frequency-limited system error dynamics

Yucelen, T., De La Torre, G. & Johnson, E. N., Jan 1 2014, In : International Journal of Control. 87, 11, p. 2383-2397 15 p.

Research output: Contribution to journalArticle

Dynamical systems
Control theory
Controllers
Stabilization
14 Citations (Scopus)

Monocular visual mapping for obstacle avoidance on UAVs

Magree, D., Mooney, J. G. & Johnson, E., Apr 1 2014, In : Journal of Intelligent and Robotic Systems: Theory and Applications. 74, 1-2, p. 17-26 10 p.

Research output: Contribution to journalArticle

Collision avoidance
Unmanned aerial vehicles (UAV)
Cameras
Sensors
Extended Kalman filters
4 Citations (Scopus)

Reference control architecture in the presence of measurement noise and actuator dynamics

De La Torre, G., Yucelen, T. & Johnson, E., Jan 1 2014, 2014 American Control Conference, ACC 2014. Institute of Electrical and Electronics Engineers Inc., p. 4961-4966 6 p. 6858669. (Proceedings of the American Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Governors
Dynamical systems
Actuators
Uncertain systems
System stability
1 Citation (Scopus)
Robot applications
Cameras
Sensors
Units of measurement
Industrial robots
2 Citations (Scopus)

Situational and terrain awareness and warning system implementation on android smartphone for manned aviation applications

Bershadsky, D., Dressel, L. & Johnson, E., Jan 1 2014, 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014. American Institute of Aeronautics and Astronautics Inc., (52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

situational awareness
warning system
warning systems
Smartphones
Alarm systems

Situational and terrain awareness and warning system implementation on android smartphone for manned aviation applications

Bershadsky, D., Dressel, L. & Johnson, E., Jan 1 2014, 52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics Inc., (52nd Aerospace Sciences Meeting).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Smartphones
Alarm systems
Aviation
Aircraft
Topography

Towards an improved metric of refinements to monocular vision-aided navigation systems

Langford, J. F. & Johnson, E., Feb 28 2014, AIAA Guidance, Navigation, and Control Conference. (AIAA Guidance, Navigation, and Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Navigation systems
Vehicle performance
Unmanned aerial vehicles (UAV)
Demonstrations
Testing
2013

Aerodynamic system identification of fixed-wing UAV

Scheper, K. Y. W., Chowdhary, G. & Johnson, E. N., Sep 16 2013.

Research output: Contribution to conferencePaper

Fixed wings
Unmanned aerial vehicles (UAV)
Identification (control systems)
Aerodynamics
Aircraft
23 Citations (Scopus)

A new command governor architecture for transient response shaping

Yucelen, T. & Johnson, E., Dec 1 2013, In : International Journal of Adaptive Control and Signal Processing. 27, 12, p. 1065-1085 21 p.

Research output: Contribution to journalArticle

Governors
Transient analysis
Dynamical systems
Controllers
Trajectories
2 Citations (Scopus)

Application of a robust adaptive control architecture to a spacecraft with flexible dynamics

Yucelen, T., De La Torre, G., Haddad, W. M., Johnson, E. N. & Rajpurohit, T., Sep 16 2013, AIAA Guidance, Navigation, and Control (GNC) Conference. (AIAA Guidance, Navigation, and Control (GNC) Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Flexible spacecraft
Spacecraft
Closed loop systems
Controllers
System theory
10 Citations (Scopus)

Artificial basis functions in adaptive control for transient performance improvement

Yucelen, T. & Johnson, E. N., Sep 16 2013, AIAA Guidance, Navigation, and Control (GNC) Conference. (AIAA Guidance, Navigation, and Control (GNC) Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Dynamical systems
Controllers
Stabilization
40 Citations (Scopus)

Autonomous flight in gps-denied environments using monocular vision and inertial sensors

Wu, A. D., Johnson, E. N., Kaess, M., Dellaert, F. & Chowdhary, G., May 21 2013, In : Journal of Aerospace Information Systems. 10, 4, p. 172-186 15 p.

Research output: Contribution to journalArticle

Global positioning system
Sensors
Inertial navigation systems
Units of measurement
Extended Kalman filters
1 Citation (Scopus)

Collaborative mapping and search for autonomous helicopters

Johnson, E., Mooney, J. G., Magree, D. P., White, M., Hartman, J. & Sahasrabudhe, V., Sep 9 2013, 69th American Helicopter Society International Annual Forum 2013. p. 1552-1560 9 p. (Annual Forum Proceedings - AHS International; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Helicopters
Aircraft
Avionics
Finite automata
Decision making

Command governor-based model reference control

De La Torre, G., Yucelen, T. & Johnson, E., Sep 11 2013, 2013 American Control Conference, ACC 2013. p. 4319-4324 6 p. 6580504

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Governors
Dynamical systems
Model reference adaptive control
Robust control
Parameterization
9 Citations (Scopus)

Concurrent learning adaptive control for linear switched systems

De La Torre, G., Chowdhary, G. & Johnson, E., Sep 11 2013, 2013 American Control Conference, ACC 2013. p. 854-859 6 p. 6579943

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Switches
Asymptotic stability
Dynamical systems
111 Citations (Scopus)

Concurrent learning adaptive control of linear systems with exponentially convergent bounds

Chowdhary, G., Yucelen, T., Mühlegg, M. & Johnson, E. N., Apr 1 2013, In : International Journal of Adaptive Control and Signal Processing. 27, 4, p. 280-301 22 p.

Research output: Contribution to journalArticle

Linear systems
Model reference adaptive control
Controllers
Asymptotic stability
Dynamical systems
2 Citations (Scopus)

Consensus protocols for networked multiagent systems with a uniformly continuous quasi-resetting architecture

Yucelen, T., Haddad, W. M. & Johnson, E., Sep 11 2013, 2013 American Control Conference, ACC 2013. p. 2019-2024 6 p. 6580132. (Proceedings of the American Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Multi agent systems
Controllers
Feedback
2 Citations (Scopus)

Consensus protocols for networked multiagent systems with relative position and neighboring velocity information

De La Torre, G., Yucelen, T. & Johnson, E. N., Jan 1 2013, 2013 IEEE 52nd Annual Conference on Decision and Control, CDC 2013. Institute of Electrical and Electronics Engineers Inc., p. 811-816 6 p. 6759982. (Proceedings of the IEEE Conference on Decision and Control).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Multi agent systems
Multi-agent Systems
Topology
Graph Laplacian
Governors

Consensus protocols in networked multiagent systems for cluttered and hostile environments

De La Torre, G., Johnson, E. N. & Yucelen, T., Sep 16 2013, AIAA Guidance, Navigation, and Control (GNC) Conference. (AIAA Guidance, Navigation, and Control (GNC) Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Multi agent systems
Cost functions
Antenna grounds
Antennas
Costs
1 Citation (Scopus)

Constrained formation protocols for networked multiagent systems

De La Torre, G., Yucelen, T. & Johnson, E., Sep 2 2013, 2013 International Conference on Unmanned Aircraft Systems, ICUAS 2013 - Conference Proceedings. p. 824-830 7 p. 6564766. (2013 International Conference on Unmanned Aircraft Systems, ICUAS 2013 - Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Multi agent systems
Collision avoidance
Cost functions
26 Citations (Scopus)

Control of multivehicle systems in the presence of uncertain dynamics

Yucelen, T. & Johnson, E. N., Sep 1 2013, In : International Journal of Control. 86, 9, p. 1540-1553 14 p.

Research output: Contribution to journalArticle

Controllers
Linear algebra
Directed graphs
Trajectories
Topology
2 Citations (Scopus)

Fourteen years of autonomous rotorcraft research at the Georgia Institute of Technology

Johnson, E., Mooney, J. G. & Christophersen, H., Jan 1 2013, American Helicopter Society International - 2nd Asian/Australian Rotorcraft Forum, ARF 2013 and the 4th International Basic Research Conference on Rotorcraft Technology 2013, IBRCRT 2013. American Helicopter Society International, p. 229-238 10 p. (American Helicopter Society International - 2nd Asian/Australian Rotorcraft Forum, ARF 2013 and the 4th International Basic Research Conference on Rotorcraft Technology 2013, IBRCRT 2013).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Adaptive control systems
Flight control systems
Unmanned aerial vehicles (UAV)
Navigation
15 Citations (Scopus)

Frequency-limited adaptive control architecture for transient response improvement

Yucelen, T., De La Torre, G. & Johnson, E., Sep 11 2013, 2013 American Control Conference, ACC 2013. p. 6631-6636 6 p. 6580880. (Proceedings of the American Control Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Transient analysis
Dynamical systems
Controllers
Stabilization
2 Citations (Scopus)

Fully autonomous indoor flight relying on only five very low-cost range sensors

Chowdhary, G., Sobers, D. M., Salaün, E., Ottander, J. A. & Johnson, E. N., Jan 2013, In : Journal of Aerospace Information Systems. 10, 1, p. 21-31 11 p.

Research output: Contribution to journalArticle

Global positioning system
Sensors
Avionics
Costs
Navigation
92 Citations (Scopus)

GPS-denied indoor and outdoor monocular vision aided navigation and control of unmanned aircraft

Chowdhary, G., Johnson, E., Magree, D., Wu, A. & Shein, A., May 1 2013, In : Journal of Field Robotics. 30, 3, p. 415-438 24 p.

Research output: Contribution to journalArticle

Inertial navigation systems
Global positioning system
Navigation
Unmanned aerial vehicles (UAV)
Aircraft
36 Citations (Scopus)

Guidance and control of airplanes under actuator failures and severe structural damage

Chowdhary, G., Johnson, E. N., Chandramohan, R., Kimbrell, M. S. & Calise, A., Jul 1 2013, In : Journal of Guidance, Control, and Dynamics. 36, 4, p. 1093-1104 12 p.

Research output: Contribution to journalArticle

Actuator Failure
Guidance
Aircraft
Transport aircraft
aircraft
2 Citations (Scopus)

Hybrid protocols for maintaining connectivity of multiagent systems

De La Torre, G., Yucelen, T. & Johnson, E. N., Jan 1 2013, 2013 IEEE 52nd Annual Conference on Decision and Control, CDC 2013. Institute of Electrical and Electronics Engineers Inc., p. 805-810 6 p. 6759981. (Proceedings of the IEEE Conference on Decision and Control).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Multi agent systems
Multi-agent Systems
Connectivity
Proximity Graphs
Consensus Problem

Improving uniform ultimate bounded response of neuroadaptive control approaches using command governors

Magree, D., Yucelen, T. & Johnson, E., Sep 16 2013, AIAA Guidance, Navigation, and Control (GNC) Conference. (AIAA Guidance, Navigation, and Control (GNC) Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Governors
Dynamical systems

Indoor GPS-denied context based SLAM aided guidance for autonomous unmanned aerial systems

Bershadsky, D. & Johnson, E., Sep 16 2013, AIAA Guidance, Navigation, and Control (GNC) Conference.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electronic guidance systems
Global positioning system
Robotics
Antennas
Collision avoidance

Longitudinal slung-load guidance for autonomous rotorcraft using rapidly-exploring Random Trees

Johnson, E. & Mooney, J. G., Jan 1 2013, American Helicopter Society International - 2nd Asian/Australian Rotorcraft Forum, ARF 2013 and the 4th International Basic Research Conference on Rotorcraft Technology 2013, IBRCRT 2013. American Helicopter Society International, p. 252-260 9 p. (American Helicopter Society International - 2nd Asian/Australian Rotorcraft Forum, ARF 2013 and the 4th International Basic Research Conference on Rotorcraft Technology 2013, IBRCRT 2013).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Slings
Helicopters
Trajectories
8 Citations (Scopus)

Monocular visual mapping for obstacle avoidance on UAVs

Magree, D., Mooney, J. G. & Johnson, E. N., Sep 2 2013, 2013 International Conference on Unmanned Aircraft Systems, ICUAS 2013 - Conference Proceedings. p. 471-479 9 p. 6564722. (2013 International Conference on Unmanned Aircraft Systems, ICUAS 2013 - Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Collision avoidance
Unmanned aerial vehicles (UAV)
Cameras
Sensors
Extended Kalman filters
1 Citation (Scopus)

Neuropredictive control and trajectory generation for slung load systems

de La Torre, G., Johnson, E. N. & Yucelen, T., Sep 16 2013.

Research output: Contribution to conferencePaper

Slings
Trajectories
Neural networks
Model predictive control
Uncertainty
10 Citations (Scopus)

Performance of a monocular vision-aided inertial navigation system for a small UAV

Magree, D. & Johnson, E., Sep 16 2013, AIAA Guidance, Navigation, and Control (GNC) Conference. (AIAA Guidance, Navigation, and Control (GNC) Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Inertial navigation systems
Unmanned aerial vehicles (UAV)
Navigation systems
Optical sensors
Navigation

Testing advanced guidance, navigation and control methods with indoor/outdoor unmanned aerial vehicles

Johnson, E. N., Jan 1 2013, 44th Annual International Symposium of the Society of Flight Test Engineers 2013. Society of Flight Test Engineers, p. 317-332 16 p. (44th Annual International Symposium of the Society of Flight Test Engineers 2013).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Unmanned aerial vehicles (UAV)
Navigation
Testing
2012
1 Citation (Scopus)

A new model reference control architecture for uncertain dynamical systems

De La Torre, G., Yucelen, T. & Johnson, E., Dec 1 2012, AIAA Guidance, Navigation, and Control Conference 2012.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Dynamical systems
Governors
Model reference adaptive control
Robust control
Parameterization
1 Citation (Scopus)

An integrated framework for adaptive optimal obstacle avoidance for rotary-wing UAVs

Kang, K., Prasad, J. V. R. & Johnson, E., Aug 17 2012, 68th American Helicopter Society International Annual Forum 2012. p. 3029-3040 12 p. (Annual Forum Proceedings - AHS International; vol. 4).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Collision avoidance
Unmanned aerial vehicles (UAV)
Trajectories
Navigation
Maneuverability
12 Citations (Scopus)

Command governor-Based adaptive control

Yucelen, T. & Johnson, E., Dec 1 2012, AIAA Guidance, Navigation, and Control Conference 2012. (AIAA Guidance, Navigation, and Control Conference 2012).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Governors
Dynamical systems
Adaptive control systems
Stabilization
Trajectories