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Book 22nd Annual Precise Time and Time Interval PTTI Applications and Planning Meeting

Download or read book 22nd Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by Goddard Space Flight Center and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book 24th Annual Precise Time and Time Interval PTTI Applications and Planning Meeting

Download or read book 24th Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by Richard L. Sydnor and published by . This book was released on 1993 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers covered: recent developments in rubidium, cesium, and hydrogen-based frequency standards, and in cryogenic and trapped-ion technology; international and transnational applications of PTTI technology with emphasis on satellite laser tracking networks, GLONASS timing, intercomparison of national time scales, and international telecommunications; applications of PTTI technology to the telecommunications, power distribution, and platform positioning, and geophysical survey industries; applications of PTTI technology to evolving military communications and navigation systems; and dissemination of precise time and frequency by means of GPS, GLONASS, MILSTAR, Loran, and synchronous communications satellites.

Book 16th Annual Precise Time and Time Interval PTTI Applications and Planning Meeting

Download or read book 16th Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by Lee Allen Breakiron and published by . This book was released on 1997 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book 22nd Annual Precise Time and Time Interval PTTI Applications and Planning Meeting

Download or read book 22nd Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by Richard L. Sydnor and published by . This book was released on 1991 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Proceedings of the Annual Precise Time and Time Interval PTTI Applications and Planning Meeting 22nd Held in Vienna Virginia on 4 6 Dec 1990

Download or read book Proceedings of the Annual Precise Time and Time Interval PTTI Applications and Planning Meeting 22nd Held in Vienna Virginia on 4 6 Dec 1990 written by and published by . This book was released on 1991 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first successful magnetic resonance experiments were those of Rabi and his associates with molecular beams in 1938. The initial experiments measured the interactions of nuclear magnetic moments with external magnetic fields, but radiofrequency spectra were soon observed that depended on internal interactions within molecules atoms. Some of the radiofrequency spectra lines were almost independent of external conditions and could therefore be used as the highly stable periodic component of an atomic clock. At present different atomic clocks can be chosen to fit the need. When high stability is not required, optically pumped rubidium cells can be chosen for their low cost, small size and light weight; such cells are stable to 10-11 over a one month period and more stable for shorter periods. When greater accuracy and stability is required, cesium beam tubes are usually used; they are accurate to better than 10-13 over extended time periods. For the highest stability requirements, as in long baseline radio astronomy and navigation in outer space, hydrogen masers are often required; they are stable to better than 10-15 over several hours. When optical frequencies need to be measured lasers must be used even though they are not yet absolute standards.