Method and apparatus for determining the angular momentum vector

Details Method and apparatus for determining the angular momentum vector Method and apparatus for determining the angular momentum vector

1995-09-11

1997-12-30

Kashnikow, Andres

Aeronautics and astronautics

Spacecraft

Attitude control

244166, B64G 136

Patent

active

057020671

ABSTRACT:
The invention relates to a method for determining the angular momentum vector of a satellite, located in an external magnetic field, relative to a satellite-integral orthogonal system of coordinates. The satellite has a torque generating system to generate pulse-shaped torques around all three axes. A magnetometer measuring on three axes is used, whose measured values are fed to a computer. In the latter, at successive points in time and using the current measured values, an observer equation is integrated, with new estimated values being determined for the angular momentum vector. Using these as well as the current measured values, an inequality is continuously checked; when it is not fulfilled, the torque generating system operates briefly, so that finally the fulfillment of the inequality is forced and identity of the last estimated value that has been determined with the rotary pulse vector to be determined is achieved.

REFERENCES:
patent: 3228628 (1966-01-01), Chubb
patent: 3232561 (1966-02-01), Adams
patent: 3429524 (1969-02-01), Buckingham et al.
patent: 3681583 (1972-08-01), Kubo et al.
patent: 5047945 (1991-09-01), Paluszek
"Spinning Spacecraft Attitude Control via the Environmental Magnetic Field", Journal of Spacecraft and Rockets, vol. 4, No. 12, Dec. 1967.
"Magnetotorquing for the Attitude Control of Geostationary Satellites", Proceedings of AOCS Conference, Nov. 1977 (the Netherlands).
"Attitude Motion of a Nonattitude-Controlled Cylindrical Satellite", Journal of Guidance, Control and Dynamics, vol. 13, No. 3, Jun. 1990.
European Search Report dated Jan. 10, 1997.

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