Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1996-11-12
1998-09-15
Grant, William
Aeronautics and astronautics
Spacecraft
Attitude control
244171, 244172, 244173, 701 13, B64G 126, B64G 136
Patent
active
058068040
ABSTRACT:
A spacecraft (10) carries a solar panel (17) which rotates to follow the sun, and also carries various thrusters (20). Thruster plume impingement on the solar panel affects the torque applied to the spacecraft body (12) in a manner which depends upon solar panel angle. The errors in the thrust during stationkeeping tend to perturb attitude, especially early in the maneuver, because of the delay inherent in the attitude control loop. A torque bias is summed with the residual torque demand signal to correct for the errors in torque. The torque bias signal is generated by a Fourier model of the torques, updated by an adaptive tuning filter, so that successive stationkeeping maneuvers progressively adapt the amplitude and phase of the Fourier coefficients in a manner which tends to minimize the residual torque demand and attitude error. Thus, the torque bias signal automatically approaches the correct value.
REFERENCES:
patent: 4407469 (1983-10-01), Fox
patent: 4537375 (1985-08-01), Chan
patent: 4591117 (1986-05-01), Scott
patent: 4684084 (1987-08-01), Fuldner et al.
patent: 5098041 (1992-03-01), Uetrecht
patent: 5687933 (1997-11-01), Goodzeit et al.
Goodzeit Neil Evan
Ratan Santosh
Bielawski W. M.
Grant William
Lockheed Martin Corp.
Meise W. H.
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