Modeling and simulation of spacecraft dynamics using bond
graph

Abstract: A model that describes the orbital dynamics and another for the thermal
behavior are obtained. The formalism used to represent them is the so-
called Bond Graph.
Their accuracy is checked with the aid of other softwares especially
devoted to represent orbits (SPENVIS) and thermal behavior (FEMLAB).
For each of these two models, estimators capable of dealing with the non-
linearities are constructed.
The next part consists of modeling the mechanical dynamics of the satellite
also with Bond Graphs. This new sub-model is interconnected with the other
two and an integrated model that represents the whole dynamics of the
spacecraft is obtained.
The final part is the composition of an estimator that takes as information
the noisy measurements of few variables of the complete system. With this
information and the knowledge of the model behavior, the estimator rebuilds
the complete thermal distribution.