This publication will depict ongoing efforts in development and ground based validation of an aerial transmissometer utilizing a ground control station composed of a collocated altazimuth mounted transmitter and receiver along with a gimbal mounted retroreflector operating on an Un-crewed Aerial System (UAS). The transmitter is composed of multiple super luminous LEDs of different wavelengths. The system measures bulk point-to-point transmission through the atmosphere and enables an investigation into atmospheric species due to wavelength dependent absorption. The measurements will be along dynamic propagation paths and enable the development of hemispherical ground truth datasets.
KEYWORDS: Clocks, Receivers, Transmitters, Free space optics, Channel projecting optics, Time metrology, Signal detection, Global Positioning System, Avalanche photodetectors
This paper introduces a method and experiment using free-space, pulsed, optical time transfer, through turbid water to synchronize spatially distant chip-scale atomic clocks. This experiment uses one-way time transfer. Clock discrepancy is computed by comparing the measured departure time from Module A to the measured arrival time at the Module B, after accounting for the estimated time of flight. The effect of the turbidity is calculated and compared through clock discrepancy and time transfer stability for an empty tank, still water, turbid water, and fog.
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