2011 All rights reserved National Metrology Centre Status Report about National Metrology Centre A*STAR By LIU Yanying Agency for Science,

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All rights reserved National Metrology Centre Status Report about National Metrology Centre A*STAR By LIU Yanying Agency for Science, Technology and Research (A*STAR)

Time Scale & Time Keeping Local Atomic Time Scale, TA(SG) one hydrogen maser MHM2010 four HP 5071A cesium frequency standards (3 high performance, 1 standard) measurement equipment Symmetricom TSC12031 backup steering device by HROG-5 UTC(SG) is realized by the maser and generated from steering device AOG All rights reserved National Metrology Centre

Time Transfer Receivers Two dual frequency receivers Septentrio PolaRx2eTR A dual frequency multi-channel GPS/GLONASS receiver TTR-3 One single frequency multi-channel Motorola OnCore GPS receiver 2011 All rights reserved National Metrology Centre

Time Transfer Main TAI link is GPS PPP observation by receiver PolaRx2eTR Another PolaRx2eTR for backup GPS & GLONASS C/A code observation from receiver TTS-3 also submitted for comparison of different techniques 2010 All rights reserved National Metrology Centre

Time & Frequency Dissemination Calibration Service (about 120 jobs/year from outside) Calibration of frequency standard (cesium, rubidium etc ) using phase comparison method Calibration of frequency/universal counter Calibration of GPSDO, GPS simulator (frequency & power level) Stopwatch, Timer 2011 All rights reserved National Metrology Centre

Time Service Network Time Service (NeTS) (~ 200 millions /day) Automated Computer Time Service (ACTS) (~ 3000 /month) Web clock Time & Frequency Dissemination 2011 All rights reserved National Metrology Centre

Other Activities 2011 All rights reserved National Metrology Centre Co-organised a ‘Time and Frequency Seminar’ with Symmetricom and local distributor Promoted national standard time on a local English newspaper “The Straits Times”The Straits Times

All rights reserved National Metrology Centre

9 Thank You 2011 All rights reserved National Metrology Centre