NTFSL TL Taiwan Entrusted by BSMI MOEA Taiwan

NTFSL, TL Taiwan Entrusted by BSMI, MOEA, Taiwan 2012 Status Report of National Time and Frequency Standard Laboratory, TL, Taiwan Time Transfer Group Time Keeping & Dissem. Group H. T. Lin F. D. Chu W. H. Tseng Y. J. Huang S. Y. Lin C. C. Lin P. C. Chang J. L. Wang C. S. Liao 1 /13 T. Y. Chiu

NTFSL, TL Taiwan Introduction Harmonized with international standard (11 Cs clocks & 3 H-masers) TAI Time Transfer UTC T/F researches Met industrial and public requirement Time Dissemination Geoscience GPS remote Power Comp calibration LF Station (Planning) servi ce • Manufactory T/F • Cal. Labs. calibration NTP (Internet) Speaking Clock Lease-line T/F • 3 C equipment ACTS • Daily life Wall clock、watch 、alarm clock Transportation Airports Telecom. E-commer. TSA MID 2 /13

NTFSL, TL Taiwan Clocks and Time Scales Ø Cesium clocks ensemble: Symmetricom 5071 A (high performance tube) 12 -Running: 11 clocks ( & buying a new one) -Under fixing: 1 clock TA(TL) is generated by 11 Cs-Clocks Ø Active H-masers: Kvarz CH 1 -75 2 (without CAT) i. Maser-3000 (with CAT) Ø Time Scale: 5 MHz i. Maser 3000 AOG-110 Steered base on UTC and TA(TL) UTC(TL) 3 /13

Microwave Frequency Measurement Using low noise mixer to convert microwave frequency (~40 GHz) to below 300 MHz for measurement With frequency resolution of 1. 0 E-04(Hz) and frequency stability (τ =1 sec) of 5. 0 E-13(carrier frequency 26. 5 GHz) Statistical X-Y chart Microwave Frequency Measurement Setup ADEV of Measurement System with 26. 5 GHz Carrier Frequency 4 /13

GNSS Calibration System Architecture Telecommunication Laboratories 5 5 /13

GNSS Phase Fluctuations for Time and Frequency Transfer LT = UT - 4 LT = UT + 8 0: background noise level, 1: moderate irregularities, 3: strong irregularities Ionospheric irregularities affect GNSS time transfer and TWSTFT. GNSS phase fluctuations obtained by observing the GPS and the GLONASS can be used to monitor ionospheric irregularities and show signal quality. 6 /13

TWSTFT Links AM 2 on 80゜E GE-23 on 172゜E AMC-1 on 257゜E Eu-Asia-Pacific Hawaii VNIIFTRI USNO PTB NTSC NIM NICT TL NPLI Hawaii Sep. 2012 Telecommunication Laboratories 7/18 7 /13

Antennas TL 03, 2. 4 m antenna (to GE-23) prepare for DPN TL 04, 1. 8 m antenna (to GE-23) Asia-Hawaii-USNO link Cable Tray TL 02, 2. 4 m antenna (to AM 2) Eu-Asia TL 01, 2. 4 m antenna (to GE-23) Asia-Pacific Telecommunication Laboratories 8/18 8 /13

NTFSL, TL Taiwan Dual Pseodo-random Noise TWSTFT TL NICT GE-23 54. 175 MHz AWG A/D 54. 175 MHz AWG 85. 875 MHz One-way ranging Calibration AWG: Arbitrary Waveform Generator A/D 85. 875 MHz One-way ranging Calibration 9/18 9 /13

NTFSL, TL Taiwan Monitoring and Recording Sub-System for the Telephone Speaking Clock Removed path delay(mean), time comparison error is within 10 10 /13

Publications v SCI, EI papers § 2011 ： 7 SCI papers & 8 EI papers • 4篇 本所第一作者或通訊作者 • 2篇 台灣大學與本所合作研究 • 1篇 中央大學與本所合作研究 § 2012 ： 5 SCI papers & 4 SCI submitted papers 論文名稱 作者 期刊名稱 Enhancing long-term stability of the optoelectronic oscillator with a probe-injected fiber delay monitoring mechanism 曾文宏等 (排序 1) Optics Express (SCI, 2011 rank 5/77 in Optics). Improvement of the Asia-Pacific TWSTFT Network Solutions by using DPN Results 林晃田等 (排序 1) IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, (SCI, 2011 rank 6/30 in Acoustics) First International TWSTFT Experiment by Employing Dual Pseudo-random Noise Codes 曾文宏等 (排序 1) IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, (SCI, 2011 rank 6/30 in Acoustics) Recent Development and Utilization of Two-Way Satellite Time and Frequency Transfer 林晃田等 (排序 1) JOURNAL OF METROLOGY SOCIETY OF INDIA(2012). (SCI) Impact of fiber delay fluctuation on reference injectionlocked optoelectronic oscillators 曾文宏等 (排序 1) Optics Letters, to be published, vol. 37, no. 18, 15 Sep, 2012. (SCI, 2011 IF=3. 399 rank 6/77 in Optics) § International conference papers • 2012 European Frequency & Time Forum : 1 • 2012 IEEE International Frequency Control Symposium (EI ): 2 • 2012 Conference on Precision Electromagnetic Measurements (EI ): 2 • 2012 Precise Timekeeping and Time Interval Application meeting : 2篇 § Patent: 1 & Applying Patent : 1 11 /13

Future Works Ø keep on cooperating with NICT in the study of DPN & CP TWSTFT Ø hold CCTF TWSTFT + APRUSC’ 13 + APMP GA’ 13 meetings Ø plan to start the study of optical comb Ø research about synchronization applications such as smart grid + NGN + precise control Telecommunication Laboratories 12/18 12 /13

Welcome to Visit TL site TL‘s FTP: • ftp: //ftp. stdtime. gov. tw/pub • Username : anonymous, port : 21 • For TWSTFT, 1 s and supplement data are available • For GNSS, RINEX and CGGTTS data are available TL‘s Website: • http: //www. stdtime. gov. tw/english/e-home. aspx • Announcements Telecommunication Laboratories 13 /13

NTFSL, TL Taiwan Thanks for your patient!! 敬請指教！ 14 /13