Report From the ITU-R Working Party 7A on Time Signals and Frequency Standard Emissions

Gerrit de Jong

Abstract:	The Working Party 7A (WP-7A) on "Time Signals and Frequency Standard Missions" is one of the four Working Parties of Study Group 7 "Science Servives" (SG 7) of the Radiocommunication Sector of the International Telecommunication Union (ITU-R). The subjects which are addressed in the WP-7A meetings on the basis of input documents as answers to Questions are: (worldwide) Standard frequency and time (T&F) dissemination from terrestrial transmitters and from satellites, including GPS, GLONASS, and Two-Way Satellite T&F transfer, time codes, requirements for high precision time, performance of T&F standards, time scale stability characterization, signal delays in antennas and other circuits, time delay measurements, compensation methods in SDH/SONET systems, etc. The results of the discussions during the meetings are presented, preferably in the form of ITU-R Recommendations to the ITU member states. Also, for the purpose of communication of the best use and selection of T&F systems to a wide group of users, the writing of handbooks in WP-7A has been started with contributions from internationally recognized specialists. The manuscript of the first handbook has been finished under Dr. R. Sydnor as main editor and D.W. Allan as co-editor. The English version has been prepared for press and is also being translated into French and Spanish. Several ITU-R Study Group and Working Party meetings were held in Geneva in October 1996. The results of the last WP-7A meeting, held 8 to 16 October 1996, are presented.
Published in:	Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting December 3 - 5, 1996 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	305 - 312
Cite this article:	de Jong, Gerrit, "Report From the ITU-R Working Party 7A on Time Signals and Frequency Standard Emissions," Proceedings of the 28th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1996, pp. 305-312.
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