NATIONAL TRACEABILITY OF GPS MEASUREMENTS IN THE REPUBLIC OF SERBIA Vukan Ogrizović, Violeta Vasilić, Siniša Del...
CompanyLogo Serbian Time and Frequency Standard  Caesium atomic clock Agilent 5071A ...
CompanyLogo Serbian Time and Frequency Standard Agilent ...
CompanyLogo National traceability chain D ...
CompanyLogo Experiment setup AT ...
CompanyLogo Measurement of a time difference  Time interval mode  Offset bet...
CompanyLogo Measurements difference [ns] ...
CompanyLogo Results Allan’s variances: ...
CompanyLogo Conclusions and recommendations  Traceability from working standards to NMI and BI...
CompanyLogo THANK YOU! Our participation on RMO2008 is supported by: ...
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National Traceability of GPS Measurements in the Republic of Serbia

International Metrology Symposium (RMO 2008), November 12-15 2008l, Cavtat, Croatia
Published on: Mar 3, 2016
Source: www.slideshare.net


Transcripts - National Traceability of GPS Measurements in the Republic of Serbia

  • 1. NATIONAL TRACEABILITY OF GPS MEASUREMENTS IN THE REPUBLIC OF SERBIA Vukan Ogrizović, Violeta Vasilić, Siniša Delčev, Jelena Gučević Belgrade University Faculty of Civil Engineering Department for Geodesy and Geoinformatics
  • 2. CompanyLogo Serbian Time and Frequency Standard  Caesium atomic clock Agilent 5071A  Nominal accuracy ±10-12  12 years warranty  Expected age of the beam up to 20 years1st International Simposium RMO 2008 2/10
  • 3. CompanyLogo Serbian Time and Frequency Standard Agilent 5071A Cs clock antenna 5 MHz TST 6490A Microphase 5MHz stepper 10 MHz TST 6460 TTS-2 GPS Digital clock receiver Agilent Ref. point 5087A UTC(ZMDM) 1 pps Distribution amplifier TST 6487 Distribution amplifier 1 pps 1 pps 10 MHz 10 MHz 5 MHz1st International Simposium RMO 2008 3/10
  • 4. CompanyLogo National traceability chain D U T C and SI Second (B IP M ) 1 pps G PS A U TC (D M D M ) E B U TC (M L 1 6 0 ) Completion of link B: C  Broadcast service  Comparing 1PPS signals EN D U SER 1 EN D U SER 2 ... EN D U SER 31st International Simposium RMO 2008 4/10
  • 5. CompanyLogo Experiment setup AT AR T R IM B L E NETR S DUT 1 pps 1 p ps In p ut A In p u t B H A M E G H M 8 12 3 T IM E serial po rt A’ B PC d ata lo g g in g1st International Simposium RMO 2008 5/10
  • 6. CompanyLogo Measurement of a time difference  Time interval mode  Offset between start pulse and stop pulse  Analysis of time differences 1 pps t S ta rt S to p T im e1st International Simposium RMO 2008 6/10
  • 7. CompanyLogo Measurements difference [ns] 200 100 0 -100 -200 -300 0 500 1000 1500 2000 2500 time [s] Raw measurements 350 300 250 frequence 200 150 100 50 0 -150 -100 -50 0 50 100 150 range Frequency histogram1st International Simposium RMO 2008 7/10
  • 8. CompanyLogo Results Allan’s variances: 1/ 2  1 M −2 2  σ y ( 2, τ ) =  2 ∑(x i+2 − 2 xi +1 + xi )   2τ ( M − 2)  i =1   2 1 N − 3 n +1  j + n −1  mod σ 2 ( τ) = ∑  ∑ ( xi + 2 n − 2 xi + n + xi )  y 2n 2 τ 2 ( N − 3n + 1)   j =1  i= j  μs for τ = 6s, Mod σ y ( τ ) = 0, 267 s μs for τ = 8s, Mod σ y ( τ ) = 0, 201 s μs for τ = 10s, Mod σ y ( τ ) = 0,159 s1st International Simposium RMO 2008 8/10
  • 9. CompanyLogo Conclusions and recommendations  Traceability from working standards to NMI and BIPM  Link from ML160 to UTC(ZMDM) should be established  Comparison of ML160 to UTC(ZMDM) 1PPS output  24 hours long logging session  Implementation of real-time calibration procedure1st International Simposium RMO 2008 9/10
  • 10. CompanyLogo THANK YOU! Our participation on RMO2008 is supported by: Faculty for Civil Engineering, Belgrade htpp://www.grf.bg.ac.yu/ Metrological Laboratory ML160, Belgrade htpp://ig.grf.bg.ac.yu/metrolab/1st International Simposium RMO 2008 10/10

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