5. Establishing the physical link: scoring, acquisition and tracking
Unlike RF transmissions, for which open-loop pointing is largely acceptable, closed-loop pointing is often required for optical transmissions. Only a feedback loop based on an external source (laser signal) can achieve the required pointing levels. The most elegant solution to this problem is for each terminal to track a signal from the other.
When this state of respective pursuit is reached, the physical link is said to be established.
The physical link is established by a synchronized sequence between the two terminals. It consists of several main stages:
the link management entity requests the establishment of the link to the two terminals concerned, specifying their respective positions and the precise time at which acquisition is to begin;
the two terminals...
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Establishing the physical link: scoring, acquisition and tracking
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