This paper presents a description of the simulation model and the on-ground performances validation of the Pointing Acquisition and Tracking (PAT) subsystem of the european SILEX program (Semiconductor laser Intersatellite Link Experiment).The SILEX scenario is composed of two terminals mounted on low Earth orbit (SPOT 4) and geostationary orbit (ARTEMIS) spacecrafts. Due to the limited laser beam divergence angle (typical intersatellite distance of 45000 km) a very accurate pointing performance is required. The PAT subsystem is in charge of the initialization of link (acquisition), of the tracking of incoming beam and of the pointing of emitted laser beam. Taking into account all disturbance sources (host spacecraft vibrations, electromechanical or optical noises) the pointing performance is less than 2irad over a frequency bandwidth of 1 kHz.In a first part, a short presentation of the retained strategies (phases of the PAT mission, operating modes) and functional architecture (control laws, sampling frequencies) is given.
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