Nanosatellite nonlinear attitude control testing on an air bearing system

Junquan Li, Mark Post, Krishna Dev Kumar

Research output: Contribution to conferencePaper

Abstract

While nonlinear attitude control has been explored widely in theory, nanosatellite air-bearing-based spacecraft simulators have not been used to test nonlinear discrete time control techniques. This paper documents development and testing of a nonlinear attitude controller for a next generation nanosatellite. A novel nonlinear control algorithm will be verified with a spherical air bearing system. The stability conditions for robustness against unmatched uncertainties and disturbances are derived using Lyapunov stability theory to establish the regions of asymptotic stabilization. The proposed control method is tested on a three-axis nanosatellite air-bearing system with reaction wheel actuation, and results are compared to numerical simulations to show that precise attitude pointing and tracking can be achieved by dealing with the issues of system nonlinearities, variations in initial conditions, external disturbances, and control force saturation, concurrently. The results will be compared with a combined feedback and feedforward momentum tracking control law in the reference. The attitude control system results will be invaluable to the development and testing of future nanosatellite payloads.

Conference

ConferenceCASI ASTRO 2012
CountryCanada
CityQuébec City, Quebec
Period24/04/1224/06/12

Fingerprint

Bearings (structural)
Nanosatellites
nanosatellites
gas bearings
attitude control
Attitude control
air
Testing
Air
disturbance
nonlinearity
simulator
control system
momentum
Force control
stabilization
disturbances
spacecraft
saturation
reaction wheels

Keywords

  • nonlinear attitude control testing
  • air bearing system
  • nanosatellite

Cite this

Li, J., Post, M., & Kumar, K. D. (2012). Nanosatellite nonlinear attitude control testing on an air bearing system. Paper presented at CASI ASTRO 2012, Québec City, Quebec, Canada.
Li, Junquan ; Post, Mark ; Kumar, Krishna Dev. / Nanosatellite nonlinear attitude control testing on an air bearing system. Paper presented at CASI ASTRO 2012, Québec City, Quebec, Canada.
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abstract = "While nonlinear attitude control has been explored widely in theory, nanosatellite air-bearing-based spacecraft simulators have not been used to test nonlinear discrete time control techniques. This paper documents development and testing of a nonlinear attitude controller for a next generation nanosatellite. A novel nonlinear control algorithm will be verified with a spherical air bearing system. The stability conditions for robustness against unmatched uncertainties and disturbances are derived using Lyapunov stability theory to establish the regions of asymptotic stabilization. The proposed control method is tested on a three-axis nanosatellite air-bearing system with reaction wheel actuation, and results are compared to numerical simulations to show that precise attitude pointing and tracking can be achieved by dealing with the issues of system nonlinearities, variations in initial conditions, external disturbances, and control force saturation, concurrently. The results will be compared with a combined feedback and feedforward momentum tracking control law in the reference. The attitude control system results will be invaluable to the development and testing of future nanosatellite payloads.",
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author = "Junquan Li and Mark Post and Kumar, {Krishna Dev}",
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note = "CASI ASTRO 2012 ; Conference date: 24-04-2012 Through 24-06-2012",

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Li, J, Post, M & Kumar, KD 2012, 'Nanosatellite nonlinear attitude control testing on an air bearing system' Paper presented at CASI ASTRO 2012, Québec City, Quebec, Canada, 24/04/12 - 24/06/12, .

Nanosatellite nonlinear attitude control testing on an air bearing system. / Li, Junquan; Post, Mark; Kumar, Krishna Dev.

2012. Paper presented at CASI ASTRO 2012, Québec City, Quebec, Canada.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Nanosatellite nonlinear attitude control testing on an air bearing system

AU - Li, Junquan

AU - Post, Mark

AU - Kumar, Krishna Dev

PY - 2012/4/24

Y1 - 2012/4/24

N2 - While nonlinear attitude control has been explored widely in theory, nanosatellite air-bearing-based spacecraft simulators have not been used to test nonlinear discrete time control techniques. This paper documents development and testing of a nonlinear attitude controller for a next generation nanosatellite. A novel nonlinear control algorithm will be verified with a spherical air bearing system. The stability conditions for robustness against unmatched uncertainties and disturbances are derived using Lyapunov stability theory to establish the regions of asymptotic stabilization. The proposed control method is tested on a three-axis nanosatellite air-bearing system with reaction wheel actuation, and results are compared to numerical simulations to show that precise attitude pointing and tracking can be achieved by dealing with the issues of system nonlinearities, variations in initial conditions, external disturbances, and control force saturation, concurrently. The results will be compared with a combined feedback and feedforward momentum tracking control law in the reference. The attitude control system results will be invaluable to the development and testing of future nanosatellite payloads.

AB - While nonlinear attitude control has been explored widely in theory, nanosatellite air-bearing-based spacecraft simulators have not been used to test nonlinear discrete time control techniques. This paper documents development and testing of a nonlinear attitude controller for a next generation nanosatellite. A novel nonlinear control algorithm will be verified with a spherical air bearing system. The stability conditions for robustness against unmatched uncertainties and disturbances are derived using Lyapunov stability theory to establish the regions of asymptotic stabilization. The proposed control method is tested on a three-axis nanosatellite air-bearing system with reaction wheel actuation, and results are compared to numerical simulations to show that precise attitude pointing and tracking can be achieved by dealing with the issues of system nonlinearities, variations in initial conditions, external disturbances, and control force saturation, concurrently. The results will be compared with a combined feedback and feedforward momentum tracking control law in the reference. The attitude control system results will be invaluable to the development and testing of future nanosatellite payloads.

KW - nonlinear attitude control testing

KW - air bearing system

KW - nanosatellite

UR - http://www.casi.ca/astro

M3 - Paper

ER -

Li J, Post M, Kumar KD. Nanosatellite nonlinear attitude control testing on an air bearing system. 2012. Paper presented at CASI ASTRO 2012, Québec City, Quebec, Canada.