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    • Planck AOCS: Precise On-Board control for slowly spinning SC

    Paper number

    IAC-07-C1.1.07

    Author

    Mr. Salvador Llorente-Martínez, SENER Ingeneria y Sistemas, S.A., Spain

    Coauthor

    Mr. Demetrio Zorita, Spain

    Coauthor

    Mr. Andrea Bacchetta, AAS-I, Italy

    Coauthor

    Mr. David Guichon, AAS-F, France

    Coauthor

    Mr. Ian Rasmussen, The Netherlands

    Coauthor

    Mr. Marc Oort, The Netherlands

    Year

    2007

    Abstract
    Planck is a Horizon 2000 scientific mission of ESA for the investigation of the Cosmic Background Radiation distribution, in order to find with high accuracy anisotropies in the radiation map. This will allow investigation of the origins of the universe. Planck is being developed and will be launched together with Herschel by Ariane 5, and both satellites will be injected in two different orbits around the Sun-Earth Lagrangian point L2, about 1.5 million kilometres from the Earth. Planck mission will perform a full map of this radiation in the celestial sphere for which purpose the satellite will continuously spin, with frequent and small reorientations of the spin direction and the swapping belt.

During the last years SENER has been developing in cooperation with Dutch Space, the AOCS of Planck and Herschel in the frame of a contract with AAS-Italy (the platform responsible), which is building it for the Prime Contractor (AAS-France), for the European Space Agency as final customer.

Planck AOCS design includes quite special properties with respect to the classical spin stabilisation concept, like:
1) Very small SC angular velocity (1 rpm), with limited gyroscopic stability but with suitability for modified conventional autonomous Star trackers. 
2) Frequent reorientation of the spin direction, with small size of reorientation by means of devoted attitude manoeuvres. 
3) High accuracy of SC pointing for a spinning satellite: 0.4 arcmin re-pointing accuracy and 0.16 arcmin of attitude determination all of this with short Manoeuvre periods, smaller than 5mn including tranquilisation, which mandates active damping of attitude oscillations. 
4) Frequent and accurate Orbit Maintenance Control without impact for the science plan, and capable for the big L2 injection manoeuvre.
5) Stringent attitude domains for instrument illumination avoidance, while maximising the operational domain. 
6) Maximum commonality with Herschel: same computer, Basic SW and Application SW development, equipments and concepts apart from common development and verification.

A general but systematic view of the control design for all AOCS modes will be provided, with emphasis on special characteristics of the design, constrains and results. The innovative usage of the same STR for 3-axis and slowly spinning satellite (via TDI technique), the fully autonomous on-board attitude determination and control and the high level of security included on-board will be presented. Finally some results and conclusions obtained during the project will be presented.
    Abstract document

    IAC-07-C1.1.07.pdf

    Manuscript document

    IAC-07-C1.1.07.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.