Boots – shoes – and leggings
Patent
1990-01-16
1992-06-23
Black, Thomas G.
Boots, shoes, and leggings
244164, 364434, B64G 124
Patent
active
051249251
ABSTRACT:
A method for East/West stationkeeping of a geostationary satellite maintains the osculating value of longitude from exceeding a specified deadband for a specified drift period between maneuvers. In the planning, the mean longitude, the mean drift rate and the mean eccentricity vector are calculated and then maneuvers are executed to maintain the values below a magnitude such that the osculating longitude will be within the specified deadband over a specified drift period. The target conditions are achieved through a plurality of maneuvers which initiate a period of free drift which lasts for a specified number of days. During the free-drift period, longitude remains within its deadband, and no additional maneuvers are needed or are performed. The method has the advantage that it can take into account limitations on thruster on-time by allowing for a generalized number of stationkeeping maneuvers.
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Bingaman Ronald H.
Gamble Donald W.
Kelly Thomas J.
White Lisa K.
Allen Kenneth R.
Black Thomas G.
Radlo Edward J.
Space Systems Loral, Inc.
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