Expert Site Visit Report

Transcription

1 Expert Site Visit Report Time and Frequency Metrology Sub Division Research Center for Metrology Indonesian Institute of Sciences RCM LIPI Metrology Enabling Developing Economies in Asia, MEDEA Project for GPS time-transfer and calibration techniques Concluding Workshop October 2017, Yangmei, Taiwan

2 Outline Introduction Expected Outcome Time Schedule/Agenda Activities Result Future Plans

3 Introduction Site Time and Frequency Metrology Sub Division, Research Center for Metrology - Indonesian Institute of Sciences (RCM-LIPI)

4 Introduction

5 Introduction Expert Dr. Ryuichi Ichikawa (NICT) Dr. Narita Hideki (NICT) Dates August 2017

6 Expected Outcome Enhancement of the technical competence and manpower in time & frequency transfer field To have input and recommendation from the expert of time and frequency transfer As preparation for performing GPS time transfer (RCM-LIPI) calibration (G2 Lab)

7 Time Schedule - Agenda No Day, Date Activity 1 Monday, August 14, 2017 Opening and Introduction Laboratory Visit Special Lecture, Basic Procedure of GPS Time Transfer System calibration 2 Tuesday, August 15, 2017 Special Lecture, GPS PPP Data Processing Exercise for Data Processing 3 Wednesday, August 16, 2017 Experimental Work for GPS Receiver Calibration 4 Thursday, August 17, 2017 Entertainment 5 Friday, August 18, 2017 Discussion Closing

8 Participants Member of Time and Frequency Metrology Sub Division, RCM-LIPI

9 Laboratory Status Time Keeping Three commercial cesium clocks were operated in Time and Frequency Laboratory, RCM- LIPI. First Clock, Cs1-BIPM Code: with normal performance tube has been used for maintaining time scale of RCM-LIPI, UTC (KIM). Two other clocks with high performance tube (Cs3, BIPM Code: and Cs4, BIPM Code: ) had been operated since 2010 as supernumerary clocks. GPS common view time transfer system using TTS3, regularly send data to BIPM. Time Dissemination Network Time Protocol over IP Network. User can synchronize to address: ntp.metrologi.lipi.go.id.

10 Laboratory Status RCM-LIPI Time Transfer System NaFS Box Calibration Work Bench 5 MHz National Frequency Standard (NaFS) HP5071A 10 MHz 1 pps NaFS Signal Distribution Amplifier To Logger (Ext Ref) 10 MHz Signal Distribution Amplifier Other Frequency Standard Pulse Distribution Amplifier To Logger (START) To Logger (Dummy STOP) 1 pps Timing Signals UTC(KIM) (Front Panel) To TTS 3 GPS common view time transfer system using TTS3, regularly send data to BIPM

11 Activities 1 st day, 14 August 2017 Introductory session and Opening Remarks First lecture, Basic Procedure of GPS Time Transfer System calibration by Dr. Ryuichi Ichikawa Overview of Space Time Standards Laboratory, NICT Time and Frequency (T&F) transfer GNSS calibration Other activities: T&F transfer using other techniques Japan Standard Time (JST) Atomic clocks and advanced techniques

12 Activities 2 nd day, 15 August 2017 Second lecture, GNSS PPP processing by Dr. Ryuichi Ichikawa PPP processing strategy IGS data and products PPP processing software packages Brief Tutorial and Trial

13 Activities 3 rd day, 16 August 2017 Laboratory visit GNSS calibration demonstration, by Dr. Ryuichi Ichikawa and Dr. Narita Hideki Practice with scenario: assume a TTS3 receiver as a G1 calibrator. assume a NICT time-stamp server as a local receiver. to measure cable delay of the local receiver using TIC. to obtain CGGTTS files from both receivers. to calculate delay difference between both receivers using two CGGTTS files.

14 Reference (Cable) Delay Measurement using TIC National Frequency Standard (NaFS) HP5071A 10 MHz 1 pps NaFS Signal Distribution Amplifier 10 MHz Pulse Distribution Amplifier To Logger (START) To Logger (Dummy STOP) Reference point UTC(KIM) (Front Panel) To TTS 3 National Frequency Standard (NaFS) HP5071A 1 pps Time Interval Counter B A Pulse Distribution Amplifier Unknown Cable (X)? Reference Cable (RC) UTC(KIM) reference point 1 st step: to measure unknown cable (X) delay

15 Reference (Cable) Delay Measurement using TIC 1st step: to measure unknown cable (X) delay, averaging time = 100 s National Frequency Standard (NaFS) HP5071A 1 pps Time Interval Counter A B Pulse Distribution Amplifier Unknown Cable (c)? Unknown Cable (b)? d Tc b = ns UTC(KIM) reference point National Frequency Standard (NaFS) HP5071A 1 pps Time Interval Counter A B Pulse Distribution Amplifier Unknown Cable (c)? Unknown Cable (b)? Connector Unknown Cable (X)? d Tc (b+x) = ns UTC(KIM) reference point d TX = ns

16 Reference (Cable) Delay Measurement using TIC 2nd step: to measure reference cable (RC) delay National Frequency Standard (NaFS) HP5071A 1 pps Time Interval Counter A B Pulse Distribution Amplifier Unknown Cable (X)? Reference Cable (RC) UTC(KIM) reference point d TX RC = ns d TX = ns d TRC = ns (reference cable delay of TTS3)

17 Comparison between TTS3 and NICT Time Server TTS3, 1 pps output isn t available Measure reference delay of NICT time server Time Interval Counter A B NICT Time Server Cable (X)? NICT cable delay (NICT) 1 pps output d TX NICT = ns d TX = ns d TNICT = ns d TTTS3 d TNICT = ns ns = ns

18 Tutorial and Trial PPP Processing Software In order to obtain accurate result by PPP, we have to consider about Precise orbit and satellite clock Ionospheric path delay correction, dual frequency Ocean tide loading effect correction Tropospheric path delay correction Antenna phase center calibration Solid earth tide and Atmospheric loading (defined in IERS convention, implemented in software processing) Reference frame

19 Tutorial and Trial PPP Processing Software at NICT CSRS-PPP (Natural Resources Canada) RTKLIB (Takasu, Tokyo University of Marine Science and Technology) C5++ (Hobiger et al.) Trial PPP processing using: CSRS-PPP (Natural Resources Canada) RTKLIB (Takasu, Tokyo University of Marine Science and Technology)

20 Tutorial and Trial PPP Processing Software Trial using RTKLIB software (Takasu, Tokyo University of Marine Science and Technology) Antenna position observation, MJD, precise orbit and satellite clock files from IGS data server

21 Tutorial and Trial PPP Processing Software Trial using RTKLIB software (Takasu, Tokyo University of Marine Science and Technology) Antenna position observation, MJD

22 Activities 4 th day, 17 August 2017 Entertainment Visited Taman Mini Indonesia Indah (TMII), Beautiful Indonesia Miniature Park (literally translated), a culture-based recreational area located in East Jakarta, Indonesia.

23 Activities About TMII, Beautiful Indonesia Miniature Park Indonesia now consist of 33 provinces. Since each Indonesian province maintains its own unique and distinct cultures, shelters, attire and dialects, TMII built a model of each of the houses from Indonesian provinces. TMII attempted not only to reconstruct the homes of the various provinces, but also to create a realistic model of the environment and shelters of the various people of Indonesia. The venues, which are situated around the main lake in a similar fashion to the different islands of the Indonesian archipelago, are thematically divided into six areas in respect to the main islands of Indonesia: Java, Sumatra, Kalimantan (Borneo), Sulawesi, the Lesser Sunda Islands, Maluku and Papua.

24 Activities 4 th day, 17 August 2017

25 Activities 5 th day, 18 August 2017 Sport activity Discussion Closing

26 Result Enhancement of knowledge and competence in time and frequency transfer Recommendation from expert More practice in the measurement and data analysis for time and frequency transfer. Robust antenna monument is essentially important for precise positioning and time frequency transfer. Future Plans Propose for G2 lab calibration in 2018

27 Photo Documentation

28 Photo Documentation

29 Photo Documentation

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