The Attitude and Orbit Control Subsystem of the Eutelsat Ii Spacecraft

Bittner, H.; Fischer, H.D.; Froeliger, J.-L.; Miltenberger, K.; Popp, Hartmut; Porte, F.; Surauer, M.

doi:10.1016/b978-0-08-037027-9.50016-1

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2004

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“…Conventionally, the antenna inertia is sensibly lower than the inertia of the satellite main body and it does not induce significant motion. Designing the antenna control and the body control separately has been sufficient in the past (Bittner et al, 1982). Recently, however, the size and weight of the antennas of the satellites have been increasing and at the same time more precise pointing accuracy is required (Tham et al, 1997).…”

Section: Introductionmentioning

confidence: 98%

Coordinated attitude control for a tracking and data relay satellite with mobile antennas

Zhang

Cao

2004

Aircraft Engineering and Aerospace Technology

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In this paper, a coordinated attitude control law for a tracking and data relay satellite (TDRS) with mobile antennas is proposed. To track or point the target spacecraft with median/law orbit, the large mobile antennas have to move in a wide range, the movement of such mobile antennas disturbing the satellite attitude. Conventionally, the main body of the satellite and the mobile antennas are controlled independently. The proposed controller first estimates the TDRS's angular momentum which the mobile antennas will produce, based on the momentum conservation equation, then adds the estimated angular momentum as a feedforward signal to the conventional control law. The proposed controller is demonstrated using mathematical simulation, the results of which coincide well with analytical results.

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Section: Introductionmentioning

confidence: 98%