Author: Publisher:
ISBN:
Category : Frequency response (Electrical engineering)
Languages : en
Pages : 658
Book Description
Proceedings of the ... Annual Symposium on Frequency Control
Author: Publisher:
ISBN:
Category : Frequency response (Electrical engineering)
Languages : en
Pages : 658
Book Description
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.
26th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: Electrical & Electronics Abstracts
Author: Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 1532
Book Description
27th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting
Author: Direct Digital Frequency Synthesizers
Author: Venceslav F. KroupaPublisher: John Wiley & Sons
ISBN: 0780334388
Category : Technology & Engineering
Languages : en
Pages : 402
Book Description
With the advent of integrated circuits (IC), digital systems havebecome widely used in modern electronic devices, includingcommunications and measurement equipment. Direct Digital FrequencySynthesizers (DDS) are used in communications as transmitterexciters and local oscillators in receivers. The advantages aresuperior frequency stability, the same as that of the driving clockoscillator, and short switching times. The difficulties are loweroutput frequencies and rather large spurious signals. Compiled for practicing engineers who do not have theprerequisite of a specialist's knowledge in Direct DigitalFrequency Synthesizers (DDS), this collection of 40 importantreprinted papers and 9 never-before published contributionspresents a comprehensive introduction to DDS properties and a clearunderstanding of actual devices. The information in this volume canlead to easier computer simulations and improved designs. Featured topics include: * Discussion of principles and state of the art of wide-rangeDDS * Investigation of spurious signals in DDS * Combination of DDS with Phase Lock Loops (PLL) * Examination of phase and background 'noise' in DDS * Introduction to Digital to Analog Conversion (DAC) * Analysis of mathematics of quasiperiodic omission ofpulses DDFS can also serve as a textbook for students seeking essentialbackground theory.
Proceedings
Author: 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.
Proceedings
Author: International Telemetering ConferencePublisher:
ISBN:
Category : Telemeter
Languages : en
Pages : 880
Book Description