DTIC ADA501959: Experimental Comparison Of Time Synchronization Techniques By Means Of Light Signals And Clock Transport On The Rotating Earth - Info and Reading Options
By Defense Technical Information Center
"DTIC ADA501959: Experimental Comparison Of Time Synchronization Techniques By Means Of Light Signals And Clock Transport On The Rotating Earth" and the language of the book is English.
“DTIC ADA501959: Experimental Comparison Of Time Synchronization Techniques By Means Of Light Signals And Clock Transport On The Rotating Earth” Metadata:
- Title: ➤ DTIC ADA501959: Experimental Comparison Of Time Synchronization Techniques By Means Of Light Signals And Clock Transport On The Rotating Earth
- Author: ➤ Defense Technical Information Center
- Language: English
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- Internet Archive ID: DTIC_ADA501959
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An experiment was conducted to investigate the equivalence of two methods of time transfer in a noninertial reference frame: by means of an electromagnetic signal using laser light pulses and by means of the slow ground transport of a hydrogen maser atomic clock. The experiment may also be interpreted as an investigation of whether the one-way speeds of light in the east-west and west-east directions on the rotating earth are the same. The light pulses were sent from a laser coupled to a telescope at the NASA Goddard Optical Research Facility (GORF) in Greenbelt, Maryland to the U.S. Naval Observatory (USNO) in Washington, DC. The optical path was made possible by a 30-cm flat mirror on a water tower near GORF and a 25-flat mirror on top of the Washington National Cathedral near USNO. The path length was 26.0 km with an east-west component of 20.7 km. The pulses were reflected back over the same path by a portable array of corner cube reflectors. The transmission and return times were measured with a stationary Sigma Tau hydrogen maser and a University of Maryland event timer at GORF, while the times of reflection were measured with a similar maser and event timer combination carefully transported to USNO. Both timekeeping systems were housed in highly insulated enclosures and were maintained at constant temperatures to within +/- 0.1 deg C by microprocessor controllers. The portable system was also protected from shock and vibration by pneumatic supports. The difference DeltaTau between the directly measured time of reflection according to the portable clock and the time of reflection calculated from the light pulse signal times measured by the stationary clock was determined. For a typical trip DeltaTau 100 ps and the corresponding limit on an anisotropy of the one-way speed of light is Deltac/c 1.5 x 10(-6).
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