Thesis defence F.J. de Bruijn: satellites
03 May 2017 12:00 - Location: Aula, TU Delft - By: webredactie TU Delft
Guidance Control and Dynamics of a New Generation of Geostationary Satellites. Promotor: Prof.dr. E.K.A. Gill (LR).
Geostationary satellites fulfill an important role in today's society. The satellites provide means of communication, navigation and Earth observation. The uniqueness of the geostationary orbit make it a scarce resource. This led to the division of the orbit in so-called slots, as well as the collocation of fleets of multiple satellites inside a single slot. Successful collocation requires methods for modeling of the (relative) motion, as well as strategies for guidance and control of these satellites, such that collisions are avoided. Since these satellite carry sensors, either as payload or in support of other activities, such as attitude determination, another important constraint on the relative motion of collocated satellites is the avoidance of the field-of-view of sensors on other satellites in the fleet. These so-called sensor cone avoidance constraints further complicate the collocation strategies.
This research investigates new methods for modeling the (relative) motion of the satellites. It also provides a novel method of analyzing constraints on the relative motion of collocated satellites. Rational relative orbital elements are introduced for this purpose. After an analysis of the geometric constraints, a method is developed for station-keeping of a satellite inside a geostationary orbit using an approach relying on convex optimization. The method is extended towards collocation of a fleet of satellites and several simulation results are presented, investigating the merits of the new method.
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