Entrusted by BSMI, MOEA, Taiwan

Transcription

1 Entrusted by BSMI, MOEA, Taiwan 2018 Status Report of National Time and Frequency Standard Laboratory, TL Time Transfer Group Time Keeping & Dissem. Group H. T. Lin W. H. Tseng Y. J. Huang C. Y. Chiu C. S. Liao S. Y. Lin C. C. Lin P. C. Chang Z. J. Huang T. K. Tseng 1

2 Clocks and Time Scales Cesium clocks ensemble: Symmetricom 5071A (high performance tube) 10 -Running: 7 clocks + 1 portable clock -Under fixing: 2 clock TA(TL) is generated by 7 Cs-Clocks 5 Active H-masers: Kvarz CH1-75 2(without CAT) imaser-3000 (with CAT) Microsemi MHM-2010 (operated on May 2014) Kvarz CH1-95 1(with CAT) Time Scale: 5 MHz AOG-110 UTC(TL) Steered base on UTC and TA(TL) 2

3 Allan Stabilities 2017/06 to 2018/06 3

4 Weight of TAI Webpage of NICT,JAPAN 4

5 Development of a Frequency-Stabilized Laser at TL(I) A task for developing a frequency-stabilized laser based on the Rb 778 nm two-photon transition is ongoing at TL, which could be used to verify the capability of our optical frequency measurement system in the future. Arrangement for measuring a DUT (frequency-stabilized laser ) using TL s fiber laser comb 5/3 5

6 Development of a Frequency-Stabilized Laser at TL(II) Laser Source Rb Cell (Enclosed) The reasons for choosing the Rb 778 nm two-photon transition as a basis for our frequency-stabilized laser are: It is in the CIPM list of approved radiations for the practical realization of the metre, 2002: frequencies and vacuum wavelengths, and the reference value of frequency is provided. Its wavelength is located in the measuring range of our fiber laser comb (TL s tool for optical frequency measurement). Cooperation with the academic organization is possible. Because the frequency stabilized laser is not a commercial one, its light path along with related optical components would be tested and organized by ourselves. We have observed the 420 nm fluorescence signal, which is induced only when a scheme of the Rb 778 nm two-photon transition works. Following pictures show a prototype test and its fluorescence result. PMT (enclosed) Fabry Pérot Cavity PBS Fluorescence detected!! 6/3 6

7 2018 BIPM G1 Calibration Tour in TL Calibration tour every other years Install BIPM B3TS (BP0U+BP1C) at April Data record from 21 st April to 13 th May Shipped to NICT around 23th May 7

8 APMP TCTF G2 GPS calibration trip TL organized the TCTF G2 GPS receiver calibration campaign among RCM-LIPI (Indonesia), MUSSD (Sri Lanka) and TL. Requested by MUSSD, and invited RCM-LIPI to participate. The traveling system was shipped out in middle October 2018, but still in the import process. 8

9 TWSTFT Links Asia-Pacific network: Eutelsat 172B Perform 24 hours in a day Satre and SDR links in parallel (NICT, KRIS) 9

10 Update SDR documents 10

11 Time difference / ns Triangle closures of SATRE and SDR Triangle Closures of OP-NIST-PTB ns SATRE modem SDR receiver Triangles σ(satre) σ(sdr) Gain factor= /ns /ns σ(satre)/σ(sdr) OP-NIST-PTB NICT-KRIS-TL PTB-NTSC-SU Mean 4.5 資料取自 BIPM 報告 11 11

12 PTB-TL TWSTFT 150 days TWSTFT link relayed via KRISS reaches as low as The BIPM is preparing the calibration for Eu- Asia TWSTFT 12

13 New Concept of Speaking Clock Design Human voice time program was used in traditional speaking clock service for more than 50 years. The newly designed time codes were inserted in the program to increase its application and fulfill the modern digital requirements. 117 Station TL Labs Time Source Time Monitoring Speaking Clock Leased line Relay office Analog and Digital time Dial No# 117 LS Manual Cal. 1 st sec 3 th sec 4 th sec 6 th sec 10 th sec Auto Cal. Head Hur. Min. Sec. Digital Codes BEEP 13

14 Experiments Hardware 1. Industrial Computer 2. FPGA Module 3. Voice Program Module 4. Experiment Circuit Board BaseBand (Digital) FPGA IPC Analog Voice Program Module PROTOTYPE RF(Analog) 14

15 Global MRA matters Visit the EMI (UAE) as a peer reviewer in surveillance assessment. Technical Assessor of secondary Labs in Dubai, Sharjah, and Abu Dubai (2018/ Oct. 19~27) Assist APMP TCQS in reviewing the CMCs of HAS, NIMT, NMIA, NMIJ, RCM- LIPI, and TISIR. 15

16 Survey on the Time Synchronization Requirements for Financial Markets in the U.S. and European standards Rule/Author Requirement Level Time standard Effective MiFID II /ESMA National Market System Plan Governing the Consolidated Audit Trail /SEC (USA) 1 s Manual orders Automated orders, 1 ms time stamp (non-hft) 0.1 ms HFT 1 s HFT time stamp resolution 50 ms Automated orders 1 s Manual orders 1 ms time stamp resolution UTC 2018/1/3 NIST 2016/11/15 16

17 2018 Proficiency Test on Freq. Measurement TL s Proficiency Test on Freq. Measurement in 2018 TL has host the 6th Proficiency Test(PT) on Freq. Measurement from late May to middle of July, domestic Labs joined this PT a set of TL s portable calibration system consist of a 5071a cesium clock, a SR620 time interval counter and a recording computer along with the DUT were sent to each participating lab sequentially (see Fig.1) The En values of the 23 participating labs are smaller than 1, which indicates that calibration ability of all participants is qualified in the activities 17

18 Future Works keep on studying SDR & CP TWSTFT Relink to PTB via relay links ABS-2A(NICT & KRISS) via KPGO and USNO stations Study diurnal effect setup T/F optical standard laboratory search for synchronization applications such as telecom 5G + power smart grid + IoT + 18