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Proceedings Paper

Breadboarding Of A High Bandwidth Acquisition And Fine Tracking System For Satellite Optical Communications
Author(s): H. Hibon; J. M. Betermier
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Paper Abstract

The critical sub-microradian pointing accuracy required for an optical intersatellite link (ISL) at 0.8 μm can be resolved by a high bandwidth pointing loop inside the telescope. This loop, consisting of two high-speed fine sterring mirrors, must ensure either a short-time step response for large angular range (20ð peak to peak) in acquisition, or it must ensure accuracy and disturbance compensation in tracking. To verify the requirements, CNES developed in 1986 a breadboard representative of an actual european ISL, built and tested at ONERA. This paper describes the breadboard, the test bench and the experimental results for acquisition and tracking. A pointing loop was assembled from two General Scanning galvanometers and a charge coupled device matrix (CCD 7851 Thomson) to perform rallying, detection and ecartometry. A laser diode illuminates the CCD array and a He-Ne laser, lighting a quadrant cell , monitors the pointing error. The rallying and tracking phases, under ISL representative illumination were tested. Furthermore, pointing loop feasibility based on CCD detection was demonstrated. Computation results, measured in step response time, accuracy, and rejection, were verified using the breadboard. Since the system was subject to few data or input disturbances, a high 800 Hz bandwidth was obtained. Finally, bandwidth bottlenecks were clearly identified

Paper Details

Date Published: 6 October 1989
PDF: 14 pages
Proc. SPIE 1131, Optical Space Communication, (6 October 1989); doi: 10.1117/12.961539
Show Author Affiliations
H. Hibon, ONERA (France)
J. M. Betermier, CNES (France)

Published in SPIE Proceedings Vol. 1131:
Optical Space Communication
Georges Otrio, Editor(s)

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