Author: Publisher:
ISBN:
Category : Frequency response (Electrical engineering)
Languages : en
Pages : 744
Book Description
Proceedings of the ... Annual Symposium on Frequency Control
Author: Publisher:
ISBN:
Category : Frequency response (Electrical engineering)
Languages : en
Pages : 744
Book Description
The 22nd Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: Frequency Standards
Author: Fritz RiehlePublisher: John Wiley & Sons
ISBN: 3527605959
Category : Science
Languages : en
Pages : 540
Book Description
Of all measurement units, frequency is the one that may be determined with the highest degree of accuracy. It equally allows precise measurements of other physical and technical quantities, whenever they can be measured in terms of frequency. This volume covers the central methods and techniques relevant for frequency standards developed in physics, electronics, quantum electronics, and statistics. After a review of the basic principles, the book looks at the realisation of commonly used components. It then continues with the description and characterisation of important frequency standards from atomic clocks, to frequency stabilised lasers. The whole is rounded of with a discussion of topical applications in engineering, telecommunications, and metrology.
Frequency Standards and Metrology
Author: Andrea De MarchiPublisher: Springer Science & Business Media
ISBN: 3642745016
Category : Science
Languages : en
Pages : 493
Book Description
Since the previous Symposium, several exciting new developments and advances have occurred in the field of frequency standards and metrology. These include the first results on the long-tenn stability of a millisecond Pulsar, for which data 14 integrated over several years now show a stability of around 10- . Improvements in the understanding of various biases in Cesium beam standards promise accuracies in the low 14s for primary standards and in the low 13s for short commercial tubes, for which long tenn stabilities in low 14s have already been shown to be obtainable by accuracy improvement. Beams using optical pumping for state selection and for detection have been operated with excellent results, and more are being realized. Other new frequency standards which have appeared include a macroscopic rf trap with Mercury ions, which perfonns in the low 15s in one day, the sub millimeter metastable Magnesium beam, which has shown a short tenn stability 19 in the low 12s in one second and promises an accuracy of 10- , and the cold Hydrogen masers, which have such high stabilities that they cannot be measured with existing local oscillators. Prospects for future developments include laser manipulation of neutrals and spectroscopy of single ions at rest in a trap. Both these groups of techniques have great potential for unprecedented accuracy and short-and long-tenn stability, and new superior frequency standards are expected to be realizable in this way in the not too distant future.
24th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: Richard L. SydnorPublisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 508
Book Description
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.
Acoustoelectronics '91 - Proceedings Of The 5th Conference
Author: L SpassovPublisher: World Scientific
ISBN: 9814555088
Category :
Languages : en
Pages : 186
Book Description
This book argues that only by reforming the international monetary system can we prevent financial crises in the future and the internationalization of the Renminbi, China's national currency, will be an important step in the process.Just as the old saying goes, 'An old building needs to be demolished before a new one can be erected in its place,' there will be no construction without destruction. The commencement of the dismantling of the old monetary system is also the beginning of the construction of the new one. Contrary to Western rhetoric, which portrays China as part of the cause of the recent financial crisis, the author contends that China is actually a victim of the current unjust international economic and monetary system. To address the imbalance and break the dollar-dominated international monetary system, the author calls for the internationalization of the Renminbi and diversification of the international monetary system.Written by one of the foremost financial practitioners in China, this book is thought-provoking and provides a unique Chinese perspective on how the international monetary system should be reformed, what the future system should look like and the role China should play in the process. It is a required reading for anyone interested in understanding China's own vision in its rise in the global political, economic and financial systems.
26th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: Frequency Stability
Author: Venceslav F. KroupaPublisher: John Wiley & Sons
ISBN: 1118159128
Category : Technology & Engineering
Languages : en
Pages : 330
Book Description
An in-depth look at the theory and applications of frequency stability An understanding of the acquisition of stable frequency is essential for anyone who needs to solve noise problems in wireless communications. This book offers a thorough introduction to the principles and applications of frequency stability, arming practicing engineers with the tools they need to minimize noise in systems and devices that affect everyday communications for millions of people. With an emphasis on both practical and scientific points of view, Frequency Stability: Introduction and Applications examines frequency and time fluctuations in resonators, as well as the stability of both standard and practical microwave oscillators. It explains noise properties of building circuit blocks, introducing time domain properties and how they relate to noise spectral densities. Including a special chapter devoted to the design and properties of phase locked loops—a crucial topic for frequency synthesizers—the book also: Examines in detail L/F noise, showing how power losses in the propagation material extend over a long period of time Covers sapphire, optoelectronics, MW, and ring oscillators with the discussion of noise in delay-line oscillators with lasers Offers an extended treatment of phase noise in semiconductors and amplifiers based on Van der Ziel investigations Emphasizes the modified Allan variance in the time domain, including exact computations Outlines the relationship between resonator frequency and output phase noises via the feedback theory Featuring numerous tables with actual data, Frequency Stability: Introduction and Applications is an invaluable guide for engineers wishing to rein in acoustic and electromagnetic interference in modern communications.
Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: The Measurement of Time
Author: Claude AudoinPublisher: Cambridge University Press
ISBN: 9780521003971
Category : Reference
Languages : en
Pages : 356
Book Description
A unique insight into the measurement of time and its applications, at an introductory level.