An Iterative Approach To Calculating The Performance Of Two Coupled Optical Intersatellite Link Tracking Subsystems

Robert A. Peters; Masaru Sasaki

doi:10.1117/12.940027

3 June 1987 An Iterative Approach To Calculating The Performance Of Two Coupled Optical Intersatellite Link Tracking Subsystems

Robert A. Peters, Masaru Sasaki

Author Affiliations +

Proceedings Volume 0756, Optical Technologies for Space Communication Systems; (1987) https://doi.org/10.1117/12.940027
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

Results of computer modelling of (1) the interaction of the pointing subsystems of two optical ISL terminals and (2) the ISL performance versus lens diameter are presented. The interaction between two ISL terminals, each with their own noise equivalent angle (NEA) was iteratively calculated (the NEA of one terminal reduces the average received beacon signal of the other, increasing its NEA, etc.). For the specific system modelled, it was found that the final NEA was very close to the initial NEA when the initial NEA was small (below 0.4 microradians). When the initial NEA was large (greater than 0.7 microradians) the iterations diverged indicating the terminals could not lock onto each other. Next, rather than assume a fixed NEA when the lens diameter was varied, the NEA was calculated for each diameter, assuming a fixed percentage of the communications laser beam was used for tracking. This substantially changes the form of the BER versus lens diameter graphs. Assuming 10% of the energy of a 120 Mbit/s link was used for tracking, the NEA for realistic links was usually less than 0.2 microradians.

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Robert A. Peters and Masaru Sasaki "An Iterative Approach To Calculating The Performance Of Two Coupled Optical Intersatellite Link Tracking Subsystems", Proc. SPIE 0756, Optical Technologies for Space Communication Systems, (3 June 1987); https://doi.org/10.1117/12.940027

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