Optical turbulence profiling at the Table Mountain Facility with the Laser Communication Relay Demonstration GEO downlink
Optics Express(2024)
摘要
We present the first time the profile of atmospheric optical turbulence has
been measured using the transmitted beam from a satellite laser communication
terminal. A Ring Image Next Generation Scintillation Sensor (RINGSS) instrument
for turbulence profiling, as described in Tokovinin (MNRAS, 502.1, 2021), was
deployed at the NASA/Jet Propulsion Laboratory's Table Mountain Facility (TMF)
in California. The optical turbulence profile was measured with the downlink
optical beam from the Laser Communication Relay Demonstration (LCRD)
Geostationary satellite. LCRD conducts links with the Optical Communication
Telescope Laboratory ground station and the RINGSS instrument was co-located at
TMF to conduct measurements. Turbulence profiles were measured at day and night
and atmospheric coherence lengths were compared with other turbulence monitors
such as a solar scintillometer and Polaris monitor. RINGSS sensitivity to
boundary layer turbulence, a feature not provided by many profilers, is also
shown to agree well with a boundary layer scintillometer at TMF. Diurnal
evolution of optical turbulence and measured profiles are presented. The robust
correlation of RINGSS with other turbulence monitors demonstrates the concept
of free-space optical communications turbulence profiling, which could be
adopted as a way to support optical ground stations in a future Geostationary
feeder link network. These results also provide further evidence that RINGSS, a
relatively new instrument concept, is effective even in strong daytime
turbulence and with reasonable ground layer sensitivity.
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