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Optical two-way timing system for space geodesy applications

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00243210" target="_blank" >RIV/68407700:21340/16:00243210 - isvavai.cz</a>

  • Result on the web

    <a href="http://dx.doi.org/10.1109/EFTF.2016.7477788" target="_blank" >http://dx.doi.org/10.1109/EFTF.2016.7477788</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1109/EFTF.2016.7477788" target="_blank" >10.1109/EFTF.2016.7477788</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Optical two-way timing system for space geodesy applications

  • Original language description

    Until now, time itself is not an observable in space geodesy. The major reason for this fact is the considerable difficulty to keep track of the phase of the clock oscillation between the point of origin and the point of the measurement. However, if geodesy will attempt to provide a reference frame fully based on general relativity, a proper treatment of time is mandatory. The Geodetic Observatory Wettzell is currently in the process to modernize the timing system such that the phase of the master clock can be established at all times. The ultra-short pulses of an optical frequency comb are transporting both time and frequency from the master clock of the observatory to the individual space geodetic techniques, namely Very Long Baseline Interferometry (VLBI), Satellite Laser Ranging (SLR) and Global Navigation Satellite System (GNSS), using a two-way approach. In order to verify the functionality of this system not only in sense of delay stability but also accuracy, we have developed a new TWTT system based on the exchange of timing signal via standard optical telecommunications Small Form-factor Pluggable (SFP) transceivers to transfer timing information between two or more terminals with the accuracy below 1 ps via optical fibers of a length of up to several tens of kilometers. The heart of the measurement device is an event timing module using surface acoustic wave filters as a time interpolator, which allows the registration of the times-of-arrival of electrical pulses with sub-picosecond timing resolution, linearity and stability. These pulses are derived from the optical signal, which is used for the communication between the terminals. Great care was taken in order to minimize terminal internal delays instability, which can be the result of temperature changes inside terminals. The design, applications and the first experiments at GO Wettzell will be discussed.

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

  • OECD FORD branch

    20201 - Electrical and electronic engineering

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2016

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Article name in the collection

    2016 European Frequency and Time Forum (EFTF 2016)

  • ISBN

    978-1-5090-0720-2

  • ISSN

  • e-ISSN

  • Number of pages

    6

  • Pages from-to

    121-126

  • Publisher name

    Institute of Electrical and Electronics Engineers

  • Place of publication

    Brighton

  • Event location

    York

  • Event date

    Apr 4, 2016

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article

    000386307700033