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STATE SCIENTIFIC CENTER OF THE RUSSIAN
FEDERATION
NATIONAL RESEARCH INSTITUTE FORPHYSICAL-TECHNICAL AND RADIO ENGINEERING MEASUREMENTS
GENERATION OF THE NATIONAL TIME SCALE UTC(SU), ITS TRANSFER TO GLONASS AND
HARMONIZATION WITH UTC
ICG-7WG-D
Igor Silvestrov4-9 november 2012, ICG-7, Beijing
Federal Law "On the calculation of time» № 107-FZ of 04.03.2011National scale of the Russian Federation - an ordered sequence of numbers of units of time, reproduced and stored by the State Service of Time, Frequency and Earth's Orientation Parameters on the basis of the State primary standard of time, frequency, and the national time scale.
Government Decree № 323 of 30.04.2008Federal Agency for Technical Regulation and Metrology carries out the support for GLONASS reference values of time and frequency, the national time scale and the Earth's Orientation Parameters data.
Interface control document GLONASS ICD 05.01, March 2008Reference time scale for the GLONASS system is the national time scale UTC(SU).
Main documents, that set the legal basis for generation and transferring of the national time scale UTC(SU) to GLONASS
Generation of the National time scale UTC(SU)
CSFO1 VNIIFTRICSFO1 VNIIFTRIaccuracy accuracy ≤≤ 5.0 E5.0 E--1616
8 8 HH--Maser clocksMaser clocksKvarzKvarz CHCH11--7575AAσσyy((ττ) ) ≤≤ 5 E5 E--16 per 16 per dayday
Physical Physical UTC(SU) UTC(SU) realizationrealizationaccuracy accuracy ≤≤ 0.5 ns0.5 ns
Physical Physical UTC(SU) RealizationUTC(SU) Realization
Switch
Primary SetPrimary Set
Backup SetBackup Set
PC
5MHz5MHz
1PPS1PPS
PR UTC(SU)AutomaticAutomatic switchingswitching inin casecase
ofof emergencyemergency situationssituations
UTC(SU) UTC(SU) –– PR UTC(SU) PR UTC(SU) ≤≤ 0.5 ns0.5 ns
HH--Maser 1Maser 1
HH--Maser 2Maser 2
Time Scale Sub Time Scale Sub System 1System 1
Time Scale Sub Time Scale Sub System 2System 2
5MHz5MHz
5MHz5MHz
1PPS1PPS
1PPS1PPS
5MHz5MHz
1PPS1PPS
AutomaticAutomatic controlcontrol
AutomaticAutomatic controlcontrol
UTC(SU) UTC(SU) –– HM(iHM(i))
Time Transfer System Time Transfer System from VNIIFTRI to GLONASS from VNIIFTRI to GLONASS GroundGround ControlControl SegmentSegment
TTSTTS--44receivers
GPS/GLONASS C/A and P3
GroundGround ControlControlSegmentSegment Equipment
VNIIFTRI VNIIFTRI Equipment
Uncertainty:
Uа ≈ 1 nsUв ≈ 2 ns
PTBPTBBIPM PTBUTC(SU)
GNSS
UTC(k)
UTC
TWSTFT
Harmonization of UTC(SU) and UTCHarmonization of UTC(SU) and UTC
Eu‐Asia link:PTB
NICTNIM
NMIJNTSC
KRISSTL
NPLI
Results of the UTC(USNO) и UTC(SU) matching using the GPS receivers
Uncertainty:- Uа ≈ 5,0 ns- Uв ≈ 5 ÷ 7 ns (with calibration)
SU01 TWSTFT Stationary station
•• Satellite: AM2 (80Satellite: AM2 (80°°E)E)•• Antenna: 1.8 metersAntenna: 1.8 meters•• TimeTechTimeTech SATRE 2 channel modemSATRE 2 channel modem•• Up and Down converter : Up and Down converter : ComtechComtech Company, 8 WCompany, 8 W•• TimeTechTimeTech SATSIMSATSIM•• Links with PTB and AsiaLinks with PTB and Asia
TWSTFT linkUTC(SU) - UTC(PTB)
Uncertainty:Uа ≈ 0.5 nsUв ≈ 2.0 ns(after calibration)
TWSTFT link UTC(SU) - UTC(PTB)
UTC(SU) - UTC(PTB)
-5
-4
-3
-2
-1
0
1
2
3
4
5
15.08.12 16.08.12 17.08.12 18.08.12 19.08.12 20.08.12 21.08.12 22.08.12 23.08.12
ns
Uncertainty:- Uа ≈ 0.3 ns- Uв ≈ 1 ÷ 2 ns
PTB - time scale matching center using TWSTFT
Links to European Sites:AOS PTF1+2INRIM ROAIPQ SPNPL TIMOCA TUGOP VSL
Links to US Institutes:NISTUSNO
Links to East-Europe and Asia:
NICTNIM
NMIJNTSC
KRISSTL
VNIIFTRINPLI
SU02 TWSTFT Transportable StationSU02 TWSTFT Transportable Station•• Satellite: AM2 (80Satellite: AM2 (80°°E)E)• Antenna: 1.2 metersAntenna: 1.2 meters•• TimeTechTimeTech SATRE 1 channel modemSATRE 1 channel modem•• Up and Down converter : Cross Tech, 16 WUp and Down converter : Cross Tech, 16 W•• TimeTechTimeTech SATSIMSATSIM•• Transportable HTransportable H--Maser clock Maser clock KvarzKvarz CH1CH1--76A, 76A, σσyy((ττ) ) ≤≤ 5E5E--1515
Calibration Uncertainty:Uа ≈ 0.5 nsUв ≈ 1.0 ns
VNIIFTRI SU01 VNIIFTRI SU01 –– SU02 Short base line experiment dataSU02 Short base line experiment data
Uncertainty:Uа ≈ 0.2 nsUв ≈ 0.5 ns
SU01 - SU02
-2,0
-1,5
-1,0
-0,5
0,0
0,5
1,0
1,5
2,0
56146 56147 56148 56149 5615028.07.2012 - 31.07.2012
ns
Potential coverage area for the new Luch-5B satellite Ku-range
Potential characteristics of the UTC(SU) and UTC(USNO) matching:
- continuous real-time mode- Uncertainty Uа ≈ 0,1 ÷ 0,3 ns- Uncertainty Uв ≈ 1 ÷ 2 ns
USNO
SU
Characteristics for the possible methods of UTC(SU) иUTC(USNO) matching
1. The same existing GNSS receivers set both in VNIIFTRI and USNOUncertainty Uа ≈ 5 nsUncertainty Uв ≈ 5 ÷ 7 ns delay - 1 day
2. Existing TWSTFT scheme: VNIIFTRI – РТВ – USNOUncertainty Uа ≈ 1 nsUncertainty Uв ≈ 3 ÷ 4 ns delay - 1 day
3. Perspective TWSTFT scheme using «Luch–5B»: VNIIFTRI – USNOUncertainty Uа ≈ 0,3 nsUncertainty Uв ≈ 1 ÷ 2 ns
continuous real-time mode
Proposals on the UTC(SU) and UTC harmonization accuracy increase
1. Set the GNSS time receivers (GLONASS/GPS) of the same type in VNIIFTRI and USNO as well as on the GPS Master Control Station and in the GLONASS Ground control segment
2. Organize the direct UTC(SU) and UTC(USNO) time scales matching using new satellite “Luch-5B”
Thank you for your attention!