Coarse Pointing and Fine Pointing mechanism (CPA and FPA) for an optical communication link

Computer Science – Multimedia

Scientific paper

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Cpa, Fpa, Optical Communication Link

Scientific paper

Future multimedia satellites require communication at large bandwidth which can be achieved by means of optical communication links. Astrium (TESAT) is currently developing a Laser Communication Terminal (LCT) for such applications under DLR contract. In 2002 the mechanisms for Pointing, Acquisition and Tracking of the laser beam between two Laser Communication Terminals were pre-developed. Based on this development work the development of mechanism H/W to be flown on TERRASAR is currently under way. After a short description of the general arrangement of the mechanisms inside the LCT, the paper describes the design of the CPA (Coarse Pointing Assembly) and of the FPA (Fine Pointing Assembly) reflecting the critical requirements and the solutions how to achieve them. The third mechanism forming the LCT mechanical equipment is the PAA (Point Ahead Assembly). Since the only difference between PAA and the FPA are the different tilt range and accuracy, the PAA will not be discussed specifically.

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