NPLI Report. for. Technical workshop and inter-laboratory comparison exercise for GPS time-transfer and calibration techniques under MEDEA
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1 NPLI Report for Technical workshop and inter-laboratory comparison exercise for GPS time-transfer and calibration techniques under MEDEA Dr. V. N. Ojha, Dr. A. Agarwal, Mrs. D. Chaddha, Dr. S. Panja, Dr. P. Arora, Mrs. P. P. Thorat, Dr. S. De, Mrs. S. Yadav, Mrs. P. Kandpal, Mr. M. P. Olaniya Time & Frequency Metrology CSIR-National Physical Laboratory, New Delhi
2 Outlines: Calibrations Atomic Clocks (Rb & Cs Freq Standards), Time Interval Counter, Hour Meter, Teleclocks, GPS timing receivers and Stopwatch. Providing traceability to IRNSS time scale. Time and Frequency Metrology Generation of UTC(NPLI) BIPM Link using GNSS BIPM Link using TWSTFT (used during Dec, 2011 to Nov, 2014) Cs Fountain Frequency Standard Evaluation of the first Cs Fountain Design and development of the second Cs Fountain. Optical Frequency Standards Initial activity on single trapped Yb + ion standard. Time Dissemination Dissemination by Telephone Time broadcast (Teleclock) and NTP server.
3 CSIR-NPL "National Measurement Institute of India & Premier Research Laboratory in the field of Physical Sciences. The National Physical Laboratory was conceptualized in 1943 by the Governing Body of Council of Scientific and Industrial Research (CSIR) & the foundation stone for the laboratory was laid on January 4, 1947 and it was one of the first National Laboratory to be set-up under the CSIR. Our Aim is To strengthen and advance physics-based research and development for the overall development of science and technology in the country Objectives : To establish, maintain and improve continuously by research, for the benefit of the nation, National Standards of Measurements and to realize the Units based on International System And to conduct extensive research in areas of physics which are most appropriate to the needs of the nation Custodian of Measurement Standards International Traceability to National Standards Realizing National Standards of Measurements Provide National Apex Body for Calibration
4 CMCs-At present CSIR-NPL has 246 CMC and 149 International Key/Supplementary inter-comparisons at the BIPM website T& F Metrology have 11 CMCs as listed below
5
6 Calibration Services We are providing UTC Traceability to the Time scale of the Indian Regional Navigational Satellite System (IRNSS). This Time scale is known as the IRNWT and is maintained by the Indian Space Research Organization (ISRO). The technique used presently is all in view GPS P3. Now recently we started to supplement this with a dedicated TWSTFT link. We are providing Time & Frequency in house Calibration Services to Test & Calibration Labs from Govt. and Industries for the calibration of Rb & Cs Atomic Clocks, Time Interval Counters, Hour meters, Teleclocks, GPS receivers and Stop watches
7 Calibration Procedures of T& F 1. Direct Frequency Measurement 2. Frequency Calibration through Time Interval Measurements 3. Calibration of Time Scale (Epoch) through Time Interval Measurement 4. Time Interval through Time Interval Measurement for Stopwatches/ Hour meters etc
8 Timing Traceability Link Between NPLI and BIPM A-Hydrogen MASER / 5MHz Distribution Amplifier Micro Phase Stepper UTC (NPLI) Distribution Amplifier Correction Bank of Cs- Clocks Clock Inter Comparison Data Processing Unit LAN/WAN NTP Server UTC(NPLI) GNSS Receiver UTC-UTC (NPLI) BIPM Server NPLI Server TWSTFT
9 10 MHz out out out 5 MHz Schematics of Generation of UTC(NPLI) To Fountain Lab To Calibration Lab Hydrogen Maser - HM1 MHM MHz 1 PPS IN 5 MHz out Distribution Amplifier-1 5 MHz IN Micro Phase Stepper 5 MHz UTC(NPLI) FREQUENCY DOUBLER Cs Clock A-C001 Cs Clock A-C001 Cs Clock A-C001 Cs Clock A-C001 Cs Clock A-C Automatic Switching Unit START START STOP Time interval counter (25psec resolution) - - Controller Workstation To Satellite Links
10 10 MHz 10 MHz Data 10 MHz Schematics of GNSS and TWSTFT Links TTS4 Multi Freq GNSS Rx Saw Filter 2.5MHz Antenna Control unit PolaRx3eTR Multi Freq GNSS Rx Beacon Receiver Workstation for controlling SATRE MODEM operation Workstation for controlling GNSS Rx operation 10 MHz Distribution Amplifier-2
11 Clock Setup, GNSS and TWSTFT Link at NPLI
12 UTC(NPLI)-UTC(PTB), ns Typical GPS P3 Link Results MJD
13 UTC(NPLI)-UTC(PTB), ns Typical GPS PPP Results MJD Using NRCAN PPP Software developed by Dept of Naural Resources, Canada
14 UTC(NPLI)-UTC(PTB), ns Typical TWSTFT Results on the Eu-Asia Network MJD
15 UTC-UTC(NPLI) and UTC-UTCr(NPLI), ns Behavior of UTC(NPLI) from April, 2012 to August, 2016 UTCr(NPLI) UTC(NPLI) MJD Note: From MJD56019 to added in UTC(NPLI) and UTCr(NPLI)
16 First Cs Fountain (NPLI-CsF1) Front View 2 x 55 l/s Ion Pumps Cs Free Flight UHV Chamber 3 Layers of Magnetic shields C-Field Solenoid Microwave Cavities Detection Zone Octagonal MOT Chamber 2 x 20l/s Ion Pumps 850 NPLI Cs-F1 is fully Operational
17 ftp://ftp2.bipm.org/pub/tai//publication/cirt/cirt.335 Live contribution to Circular-T
18 Second Cs Fountain (NPLI-CsF2) (1, 1,1) geometry for cooling and launching Two coils in anti-helmholtz configuration Three pairs of rectangular Helmholtz coils Two detection beams of 10 mm x 10 mm Optical pumping to enhance the m f = 0 population
19 Single Trapped 171 Yb + based Optical Frequency Standard Instability of frequency standard: 0 1 c N A T
20 U + V CosΩt E 6 Trapping and laser cooling of a ytterbium ions within a RF trap fluorescence detection E 2 E nm nm E 3 E nm All lasers are focussed on single ion E nm y z x
21 Time Dissemination Teleclock Service Internet Time Service Domain name: time.nplindia.org
22 Future Plan We are establishing new Time Scale in New Metrology Building Improving Teleclock service and replacing with Fonoclock with the accuracy of few tens of millisecond Improving NTP service facility
23 Thank You!
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