24 February 2017 Multi-beam laser beacon propagation over lunar distance: comparison of predictions and measurements
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A multi-beam beacon was transmitted from the Optical Communication Telescope Laboratory (OCTL) located at Table Mountain, CA to the Lunar Laser Space Terminal (LLST), on-board the Lunar Atmospheric Dust and Environment Explorer (LADEE) spacecraft, during NASA’s recent Lunar Laser Communication Demonstration (LLCD). The laser beacon (1568±0.1 nm) was square wave modulated and sensed by a quadrant sensor on LLST. While link acquisition and tracking proceeded with the sensed signal, on-board processing extracted power incident on the quadrant sensor and telemetered it down over the optical downlink. Subsequently, post-processing of the codewords received at OCTL retrieved the power time series recorded at LLST. Analysis comparing measured and predicted mean irradiance delivered to LLST consistently agreed to within < 1 decibel (dB). Irradiance fluctuations detected at LLST were reconciled with an uplink wave-propagation simulation model using Kolmogorov phase screens.
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A. Biswas, A. Biswas, S. Piazzolla, S. Piazzolla, } "Multi-beam laser beacon propagation over lunar distance: comparison of predictions and measurements", Proc. SPIE 10096, Free-Space Laser Communication and Atmospheric Propagation XXIX, 1009607 (24 February 2017); doi: 10.1117/12.2254976; https://doi.org/10.1117/12.2254976


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