Mass center estimation of a drag-free satellite
Abstract
The mass center location of a spinning drag-free satellite can be estimated because there is control required to accelerate the mass center along the axis of spin as long as there is some nutation in the spinning motion. Linear and nonlinear models are compared and observability discussed. Online estimation fails when nutation is damped so an offline mechanization is proposed. A new sensor has been designed to permit greater relative motion than was possible on the drag-free satellite flown in 1972 (JH-1). Experimental laboratory results using a spinning vehicle with the new sensor mounted 30 cm from a spherical air bearing support are presented which confirm earlier simulation results.
- Publication:
-
International Federation of Automatic Control, 6th Triennial World Congress
- Pub Date:
- 1975
- Bibcode:
- 1975ifac.proc...35S
- Keywords:
-
- Analog Simulation;
- Center Of Gravity;
- Nutation Dampers;
- Satellite Drag;
- Spacecraft Control;
- Acceleration (Physics);
- Aerodynamic Drag;
- Estimators;
- Feasibility Analysis;
- Feedback Control;
- Mathematical Models;
- Spacecraft Design;
- Spin Dynamics;
- Astrodynamics