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BIPM Time Dept database
<html> <head> <SCRIPT LANGUAGE='javascript' SRC='/webdb/js/hide.js'> </SCRIPT> <br> <META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW" http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <TITLE>BIPM Time Dept database</TITLE> <LINK href="/webdb/css/page.css" rel="stylesheet" type="text/css"> <LINK href="/webdb/css/liste.css" rel="stylesheet" type="text/css"> <LINK href="/webdb/css/gnss.css" rel="stylesheet" type="text/css"> <LINK href="/webdb/css/monmenu.css" rel="stylesheet" type="text/css"> <LINK href="/webdb/css/sitemap.css" rel="stylesheet" type="text/css"> <link rel="icon" href="https://webtai.bipm.org/img/favicon.png" type="image/png" /> <link rel="shortcut icon" href="https://webtai.bipm.org/img/favicon.png" type="image/png" /> </head> <body> <TABLE id=entete border=0> <TR height=90px><TD colspan=6 id='entete' >BIPM Time Department Data Base</TD></TR> <TR> <TD class=monmenu> <ul id=dropdown> <li> <a href=/database/index.html>Participation</a> <ul class=sousmenu> <li> <a href=/database/showlab.html>Laboratories</a> </li> <li> <a href=/database/participant.html>Current status</a> </li> <li> <a href=/database/maps.html>Geographical map</a> </li> <li> <a href=/database/guidelines.html>Rules & guidelines</a> </li> <li> <a href=/database/presentations.html>Tutorials & CBKT</a> </li> <li> <a href=/database/dissemination.html>Dissemination services</a> </li> </ul> </li> </ul> </TD> <TD class=monmenu> <ul id=dropdown> <li> Equipments <ul class=sousmenu> <li> <a href=/database/clocklab.html>Clocks</a> </li> <li> <a href=/database/gnss.html>GNSS</a> </li> <li> <a href=/database/tw.html>TWSTFT</a> </li> <li> <a href=/database/equipment.html>Source of UTC(k)</a> </li> <li> <a href=/database/psfs_access.html>PSFS</a> </li> </ul> </li> </ul> </TD> <TD class=monmenu> <ul id=dropdown> <li><a href=/database/readme_clb.html> Calibrations</a> <ul class=sousmenu> <li> <a href=/database/calid_gnss.html>GNSS status </a> </li> <li> <a href=/database/calib.html>GNSS results</a> </li> <li> <a href=/database/calid_tw.html>TWSTFT status</a> </li> </ul> </li> </ul> </TD> <TD class=monmenu> <ul id=dropdown> <li><a href=/database/readme_clk.html> Resources</a> <ul class=sousmenu> <li> Graphs <ul class=sousmenu3> <li> <a href=/database/canvas.html>UTC-UTC(k)</a> </li> <li> <a href=/database/canvas_gnss.html>UTC and GNSS</a> </li> <li> <a href=/database/show_psfs.html>PSFS contributions</a> </li> <li> <a href=/database/d_plot.html>Fract. deviation <i>d</i></a> </li> </li> </ul> <li> <a href=/database/clock.html>Clock stats & codes</a> </li> <li> <a href=/database/howtoclk.html>Get clock code</a> </li> <li> <a href=/database/timescales.html>Time scales</a> </li> </ul> </li> </ul> </TD> <TD class=monmenu> <ul id=dropdown> <li> Web services <ul class=sousmenu> <li> <a href=/api/>API UTC</a> </li> <li> <a href=/api/ccl-cctf/>API CCL-CCTF</a> </li> <li> <a href=/database/../ftp/pub/tai/>FTP results</a> </li> </ul> </li> </ul> </TD> <TD class=monmenu><ul id=dropdown><li><a href=/database/index.html>Home</a><ul class=sousmenu> <li> <a href=/database/sitemap.html>Site Map</a> </li> <li> <a href=/database/mailing.html>Newsletter</a> </li> <li> <a href="javascript:hidden_email('tai','bipm.org','');">Contact us</a> </li> </ul> </li> </ul> </TD> </TR> </TABLE> <H3>Characterizations of time transfer equipment</H3> The BIPM Time Department manages the calibration of time transfer systems used to generate UTC.<br>Calibrations may be carried out by the <b>BIPM</b>, by the <b>RMOs</b>, by <b>individual time laboratories</b> or, in some cases, by other entities such as <b>manufacturers</b>.<br><br><li>Starting 2015, calibrations in laboratories contributing to UTC follow specific guidelines (see <a href=/ftp/pub/tai/publication/gnss-calibration/readme.pdf>GNSS ReadMe</a>, <a href=/ftp/pub/tai/publication/gnss-calibration/guidelines/>GNSS</a> and <a href=/ftp/pub/tai/publication/twstft-calibration/guidelines/>TWSTFT</a> guidelines).<br>Calibration results are labelled with a calibration identifier (Cal_ID) to enable the process yielding the results to be traced.<br>The Cal_ID is used to report calibration information in Section 5 of Circular T.</li>The calibration identifiers are of the form <b>znnn-YYYY</b> where <b>z</b> identifies the type of calibration; <b>nnn</b> is a number assigned by the BIPM; <b>YYYY</b> indicates the year (typically the start of the calibration exercise).<br>The types of calibration are:<br> z = 0: For TWSTFT links, whatever the technique used for the link calibration. nnn then is the calibration identification of the ITU format.<br> z = 1: For GNSS systems, with GNSS calibration campaigns under the supervision of the BIPM; nnn then identifies a report corresponding to a calibration trip; see details in the GNSS Guidelines.<br> z = 2: For GNSS systems, calibrated with other techniques (e.g. manufacturer calibration, absolute calibration, or transfer using a calibrated link); nnn then identifies a report and is a sequential number within the year.<br> z = 3: direct links, e.g. through RF cables or optical fibres; nnn then identifies a report and is a sequential number within the year.<br><br><li>Calibrations made before 2014 have been included in the current scheme by assigning a Cal_ID when a full report is available. <br>The history of calibrations until 2014 can also be accessed at <a href=/ftp/pub/tai/publication/time-calibration/Archive/> archives </a>.</li><br>On this website, you can access the calibration results and reports for all techniques contributing to UTC.<br>Results for time transfer equipment are stored in BIPM Time Department database, some dedicated webpages allow to consult this database .<br><h4>GNSS calibrations</h4><li>ReadMe :<a href=/ftp/pub/tai/publication/gnss-calibration/readme.pdf> Here </a> </li><li>Full list of calibrations : <a href=calid_gnss.html> Here </a></li> <li>Search calibrations by laboratory/equipment : <a href=gnss.html> Here </a> </li><li>Calibrations guidelines : <a href=https://webtai.bipm.org/ftp/pub/tai/publication/gnss-calibration/guidelines/> Here </a></li> <li>How to get GNSS calibration for UTC(k) laboratories : <a href=https://webtai.bipm.org/ftp/pub/tai/publication/gnss-calibration/guidelines/How-to-get-calibration-March2024.pdf> Here </a> </li><h4>TWSTFT calibrations</h4><li>Full list of calibrations : <a href=calid_tw.html> Here </a> </li><li>Search calibrations by laboratory/equipment : <a href=tw.html> Here </a> </li><br><br><hr><TABLE class='sitemap'> <tr> <td class='sitemap'><a href="/database/index.html" class='sitemap'>Home</a></td> <td class='sitemap' ><a href="../ftp/pub/tai/" class='sitemap'>FTP results</a></td> <td class='sitemap'><a href="../api" class='sitemap'>API UTC</a></td> <td class='sitemap'><a href='/page/sitemap.html' class='sitemap'>Sitemap</a></td> <td class='sitemap'><a href="javascript:hidden_email('tai','bipm.org','');" class='sitemap' >Contact us</a></td> <td class='sitemap'><a href="javascript:hidden_email('aharmeg','bipm.org','');" class='sitemap' >Webmaster</a></td> </tr> </TABLE> </body> </html>