Differential Comparison of the One-Way Speed of Light in the East-West and West-East Directions on the Rotating Earth
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Alley, C. O., R. A. Nelson, Y. H. Shih, et al. "Differential Comparison of the One-Way Speed of Light in the East-West and West-East Directions on the Rotating Earth." Presented at the Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting (20th) held in Vienna, May 26, 2010. https://apps.dtic.mil/sti/html/tr/ADA519904/index.html.
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This is a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
A status report is presented for a time transfer experiment which compares the times of flight in the east-west and west-east directions of short pulses of light sent from a laser coupled to the 48-inch telescope at the NASA Goddard Optical Research Facility to the U.S. Naval Observatory and reflected back over the same path. The times t₁ and t₃ when each light pulse leaves GORF and returns are measured with an event timer referenced to a hydrogen maser. The timer t₂ when the pulse is reflected at USNO is measured with a portable event timer and maser combination carried in a heated and air-conditioned truck. Each maser is maintained in a temperature-controlled environment. The portable maser enclosure is supported by pneumatic shock and vibration suppression mounts.