Satellite thruster uncertainty estimation in transition mode

Details Satellite thruster uncertainty estimation in transition mode Satellite thruster uncertainty estimation in transition mode

1992-12-23

1995-05-02

Barefoot, Galen L.

Aeronautics and astronautics

Spacecraft

Attitude control

364459, B64G 126

Patent

active

054112273

ABSTRACT:
The estimation and compensation of fixed, but unknown uncertainties of a thruster (22) for improving satellite attitude estimation and control as well as eliminating the need for nutation damping devices is disclosed. A thruster (22) is fired and an attitude state is estimated using an estimator (116). A commanded rate change (122) is calculated, which is modified using a compensating feedforward command (126) as updated by a fixed uncertainty estimator (124) unless an estimated rate is less than an absolute value of a threshold rate. The modified commanded rate change (130) is used to incrementally adjust thruster fire on-time (104) until a predetermined satellite trajectory is reached.

REFERENCES:
patent: 3944172 (1976-03-01), Becker
patent: 4537375 (1985-08-01), Chan
patent: 4958788 (1990-04-01), Namera et al.
patent: 4961551 (1990-10-01), Rosen
patent: 5098041 (1992-03-01), Uetrecht
patent: 5124925 (1992-06-01), Gamble et al.

Affiliated with

Also associated with

Rating

Satellite thruster uncertainty estimation in transition mode does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Satellite thruster uncertainty estimation in transition mode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Satellite thruster uncertainty estimation in transition mode will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1131911