Computer Science – Performance
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.6877e...6k&link_type=abstract
Free-Space Laser Communication Technologies XX. Edited by Mecherle, Steve. Proceedings of the SPIE, Volume 6877, pp. 687708-687
Computer Science
Performance
Scientific paper
Array-based architectures for deep-space photon counting lasercom links offer a powerful mechanism to lower the cost and improve the scalability of Earth- or space-based optical receivers. In this architecture, a large area receive telescope is constructed by using an array of small, inexpensive telescopes that are networked together. However, a limitation on how many small telescopes can be used comes from the minimum SNR requirement for synchronization. In general, the synchronization requirements are not difficult to meet for systems with enough SNR to achieve >Mbps performance. However, deep-space links often have large variations in their operational parameters due to varying link distances from orbital considerations as well as atmospherics. If the system is required to operate under such stressing conditions, albeit with a low (100's of Kbps) data rate, it is important to consider required SNR for synchronization as a design parameter. Furthermore, for very remote systems (e.g. beyond Mars), expected data rates may only be 100's of Kbps, in which case synchronization will be a critical design parameter. In this paper, we will examine the design trade space between number of arrayed telescopes and synchronization parameters. We will focus on the low SNR/ low data rate case as it is the most stressing.
Boroson Don M.
Khatri Farzana I.
Zogbi George
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