Use of reflected radio waves for calibrating tie-in channels of time scales

Dudnik, B. S.; Kashcheev, B. L.; Смирнов, А. Н.

doi:10.1007/bf00815028

Cited by 1 publication

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“…The uncertainties in this technique are caused by a lack of knowledge of the velocity of the ion cloud, the signal-to-noise ratio of the transmission, the dispersion of the timing signal over the _ansmission path, the lack of a clean definition of time on the rise time of a dispersed pulse at the receivers, the uncertainties in the transmitter and receiver equipment delays, the measurement noise, and the Sagnac effect. Soviet scientists have estimated or measured the errors caused by all of these uncertainties V-31 = with the exception of the Sagnac effect, which is the relativistic effect due to the rotation of the Earth, and it is quite small--up to about 10 nanoseconds, depending upon the geometry of the path (Dudnik et al, 1973(Dudnik et al, , 1986).…”

Section: Non-traditional Techniquesmentioning

confidence: 99%

Soviet precision timekeeping research and technology

Vessot¹,

Allan²,

Crampton³

et al. 1991

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An Eml31oyee-Owned Company DISTRIBUTION OF THIS DOC'JMEN[ iS LJNLiMITED, REPORTS Although FASAC examines world applied science, emphasis is placed on research in the Soviet Union. The Center reports on what the Soviets call exploratory research (akin to Department of Defense 6.1 and 6.2 research), which seeks to translate developments in fundamental research into new technology. Further, as the globalization of advanced technology proceeds, more FASAC assessments are of foreign (non-Soviet) research efforts. The Center generally does not report on technology already being incorporated in engineering applications. Inaddition to an assessment of the quality and emphasis of foreign research, a Center report provides milestones for monitoring subsequent progress, lt also provides elements of a net technical assessment of the balance with US science, without being an out-and-out comparison. ORGANIZATION The permanent Center staff includes the Center's Director, two Senior Scientists, a Senior Editor, a Technical InformationSpecialist, and an Assistant Editor. FASAC panels consist of expert consultants from academia, industry,and government,typicallysixto eight members per panel. Each panel assesses the status and potential impacts of foreign applied science in a selected area. Panel members are selected by the followingcriteria: leading authority in the field; recent "hands-on" experience; knowledgeof foreign research; and knowledge of the directionof US research programs. The panels review broadareasof applied scienceandthen focuson particularactivitiesof interestto their assessment. At intervals, panelsare convenedto reassesspastFASAC topicsinvolvingareas of rapidlyadvancingscienceandtechnology of particularimportance. The Directorand SeniorScientistshelp select the topicsto be assessed, select the Panel Chairmen, and guide and assist in the preparationof panel reports. The Technical Information Specialist assists each panel with searchesfor/provisionsof relevantand availableforeigntechnicalliterature.In-depth expert reviewof literature bypanel membersprovidesa basisfor judgingthe qualityof foreign science researchactivities. The preparation of assessment reports by the panels of experts is assisted to academic-quality completion by the Senior and Assistant Editor.

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Section: Non-traditional Techniquesmentioning

confidence: 99%