Microvibrations on a Geo Telecommunication Satellite

摘要

Analyses carried out to assess the microvibration characteristics on a geostationary (GEO) satellite are reported. The aims of these studies were both to increase the knowledge of the levels of dynamic perturbations transmitted to the optical terminal on board the geostationary satellite, and to develop methods and tools able to deal with emerging applications such as SILEX (Semiconductor laser Intersatellite Link Experiment). The simulations and tests which were performed on the TDF1 satellite in order to characterize the microvibration levels at a simulated point of interface between TDF1 and a mounted instrument are summarized. The analysis of the complete transmission of the disturbances generated by onboard pieces of equipment such as momentum wheels and thrusters up to the instrument's line of sight is presented. A general simulation model was developed using JAMES software means to further investigate the coupled system: spacecraft and aerial part. Parameters which may affect microvibration transmission, such as unbalances, friction, gimbal configuration, were tuned and many simulations were run in order to quantify their impacts. A comparison between levels at the interface and on the instrument's line of sight was established for the main sources of disturbance. The adequacy of methods and tools developed for future applications is presented.