I would have thought it meant a satellite drifting outside its control deadband... that is a box (in the simple case) in 'phase space' wherein no control input is required. Consider a 1D simplification of a phase plane control system... For example, a satellite in the exact desired position, but with a high velocity relative to that position, may require control input because it's outside the control system deadband in the velocity axis. It hasn't violated its physical position boundary, but its velocity relative to that position has been violated. Alternatively, for a satellite that may be out of position, but with a velocity toward the desired position, no control input would be necessary because it is already returning. It is still within its deadband. Assuming a constant velocity relative to desired point, it will at some point (likely -before- attaining its desired position) require another control input because it has violated the velocity axis for that position. I hope I've explained the concept well enough. I wouldn't want to say more without drawing a phase-plane plot. Pictures say so much more. :) As for whether that's the correct interpretation of this case, I don't know. Cheers, JCA Quoting John Locker <john@satcom.freeserve.co.uk>: > Hi all, > > Can anyone explain what is meant by "deadband violation" when refering to > geo comsats ? > I was under the impression it related to a bird drifting outside its > control > box , however I read something today that makes me think that theory is > wrong......anyone help ? > > > Many thanks, > > John. > > > ------------------------------------------------------------------------- > Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: > http://www.satobs.org/seesat/seesatindex.html > > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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