Satellites and roll/yaw controls therefor

Details Satellites and roll/yaw controls therefor Satellites and roll/yaw controls therefor

1982-07-12

1985-03-12

Chin, Gary

Boots, shoes, and leggings

364459, 244166, B64G 110

Patent

active

045049122

ABSTRACT:
In the disclosed satellite and arrangement therefor, roll or yaw of a satite with pitch momentum bias and travelling on a substantially polar orbit with the aid of a coil interacting with the earth's magnetic surface includes a timing arrangement for dividing the orbit of the satellite into four successive quadrants P1, P2, P3, and P4, with the quadrants being inclined at an angle of 45.degree. to the equator and the quadrants P2 and P4 being polar quadrants and the quadrants P1 and P3 being equatorial quadrants. A first control unit produces satellite control signals in response to the timing means which are arranged to use the first control while the satellite is in the polar quadrants and the second control unit when the satellite is in the equatorial quadrants. The sign of the control unit is inverted in the quadrants P3 and P4, but maintained in the quadrants P1 and P2. Both controls use or generate internal signals corresponding to the roll angles and roll velocity to produce the control unit signals. However, the second control unit effects another signal equivalent to using or generating a roll acceleration signal.

REFERENCES:
patent: 3834653 (1974-09-01), Perkel
patent: 3866025 (1975-02-01), Cavanagh
patent: 3937423 (1976-02-01), Johansen
patent: 3998409 (1976-12-01), Pistiner
patent: 3999729 (1976-12-01), Muhlfelder et al.
patent: 4062509 (1977-12-01), Muhlfelder et al.
patent: 4071211 (1978-01-01), Muhlfelder et al.
patent: 4084773 (1978-04-01), Schmidt, Jr. et al.
patent: 4114841 (1978-09-01), Muhlfelder et al.

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