By the same authors

EUTELSAT satellite collocation

Research output: Chapter in Book/Report/Conference proceedingChapter



Publication details

Title of host publicationASTRODYNAMICS 2001, PTS I-III
DatePublished - 2001
Number of pages18
Original languageEnglish
ISBN (Print)0-87703-488-5

Publication series

ISSN (Print)1081-6003


EUTELSAT has collocated geosynchronous communications satellites at 13 East since April 1995. NowadaYs this constellation consist of 1v Hot Bir) spac cr based on Alcatel SpaceBus-2000 and Astrium Eurostar-2000+ platform families. The operational constraints and orbital configuration are described. Description of constellation build-up and the results of its day-to-day maintenance over these years are presented. The expected evolution for this collocation group is also given.

The constraints imposed during operations (according to their priorities) are as follows:

avoidance of collisions and dangerous proximities within the constellation;

station keeping window of +/-0.1degrees in both axes (longitude and latitude);

geometrical constraints due to RF interference between satellites (if necessary);

uniform station keeping cycles of 14 clays, composed of a single North-South manoeuvre, a single East thrust 2 days later, followed by performance assessment of both,

same station keeping strategy for all satellites;

avoidance of manoeuvre execution on many satellites simultaneously.

The concepts of strategy development are given, taking into account the above-listed constraints and satellite position uncertainties. The preferred combined eccentricity and inclination vector separation technique is described, along with the minimum inter-satellite separations maintained.

The main accent is focused on the results of the operational experience over the recent years, especially maintaining the collocation constellation populated with different spacecraft families, as well as addition and removal of satellites to/from the constellation.

Eutelsat SCC software facilities for the strategy development, collocation monitoring, operational planning, execution and assessment of the manoeuvres are also described.

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