Vision-Based Distributed Formation Control Without an External Positioning System

In this paper, we present a fully distributed solution to drive a team of robots to reach a desired formation in the absence of an external positioning system that localizes them. Our solution addresses two fundamental problems that appear in this context. First, we propose a 3-D distributed control...

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Veröffentlicht in:	IEEE transactions on robotics Jg. 32; H. 2; S. 339 - 351
Hauptverfasser:	Montijano, Eduardo, Cristofalo, Eric, Dingjiang Zhou, Schwager, Mac, Sagues, Carlos
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York IEEE 01.04.2016 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Aerial robotics Algorithms Cameras Controllers Convergence distributed robot systems Estimates Formations Hardware Kinematics Measurement motion control Orientation Robot kinematics Robot vision systems Robots Simulation Three dimensional visual servoing visual servoing motion control Aerial robotics distributed robot systems
ISSN:	1552-3098, 1941-0468
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Abstract	In this paper, we present a fully distributed solution to drive a team of robots to reach a desired formation in the absence of an external positioning system that localizes them. Our solution addresses two fundamental problems that appear in this context. First, we propose a 3-D distributed control law, designed at a kinematic level, that uses two simultaneous consensus controllers: one to control the relative orientations between robots, and another for the relative positions. The convergence to the desired configuration is shown by comparing the system with time-varying orientations against the equivalent approach with fixed orientations, showing that their difference vanishes as time goes to infinity. Second, in order to apply this controller to a group of aerial robots, we combine this idea with a novel sensor fusion algorithm to estimate the relative pose of the robots by using onboard cameras and information from the inertial measurement unit. The algorithm removes the influence of roll and pitch from the camera images and estimates the relative pose between robots by using a structure from the motion approach. Simulation results, as well as hardware experiments with a team of three quadrotors, demonstrate the effectiveness of the controller and the vision system working together.
AbstractList	In this paper, we present a fully distributed solution to drive a team of robots to reach a desired formation in the absence of an external positioning system that localizes them. Our solution addresses two fundamental problems that appear in this context. First, we propose a 3-D distributed control law, designed at a kinematic level, that uses two simultaneous consensus controllers: one to control the relative orientations between robots, and another for the relative positions. The convergence to the desired configuration is shown by comparing the system with time-varying orientations against the equivalent approach with fixed orientations, showing that their difference vanishes as time goes to infinity. Second, in order to apply this controller to a group of aerial robots, we combine this idea with a novel sensor fusion algorithm to estimate the relative pose of the robots by using onboard cameras and information from the inertial measurement unit. The algorithm removes the influence of roll and pitch from the camera images and estimates the relative pose between robots by using a structure from the motion approach. Simulation results, as well as hardware experiments with a team of three quadrotors, demonstrate the effectiveness of the controller and the vision system working together.
Author	Sagues, Carlos Schwager, Mac Montijano, Eduardo Dingjiang Zhou Cristofalo, Eric
Author_xml	– sequence: 1 givenname: Eduardo surname: Montijano fullname: Montijano, Eduardo email: emonti@unizar.es organization: Centro Univ. de la Defensa, Zaragoza, Spain – sequence: 2 givenname: Eric surname: Cristofalo fullname: Cristofalo, Eric email: emc73@bu.edu organization: Dept. of Mech. Eng., Boston Univ., Boston, MA, USA – sequence: 3 surname: Dingjiang Zhou fullname: Dingjiang Zhou email: zdjatbu@gmail.com organization: Dept. of Mech. Eng., Boston Univ., Boston, MA, USA – sequence: 4 givenname: Mac surname: Schwager fullname: Schwager, Mac email: schwager@stanford.edu organization: Dept. of Aeronaut. & Astronaut., Stanford Univ., Stanford, CA, USA – sequence: 5 givenname: Carlos surname: Sagues fullname: Sagues, Carlos email: csagues@unizar.es organization: Inst. de Investig. en Ing. de Aragon, Univ. de Zaragoza, Zaragoza, Spain
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SubjectTerms	Aerial robotics Algorithms Cameras Controllers Convergence distributed robot systems Estimates Formations Hardware Kinematics Measurement motion control Orientation Robot kinematics Robot vision systems Robots Simulation Three dimensional visual servoing
Title	Vision-Based Distributed Formation Control Without an External Positioning System
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