Time-frequency and metrological assurance complexes

Time-frequency and metrological assurance complexes
State Scientific Center
of the Russian
Federation
National Research Institute for
Physical-Technical and Radio Engineering Measurements
Time-frequency and metrological assurance
complexes development for GLONASS system
(United Nations/Russian Federation
Workshop on Applications of Global Navigation Satellite Systems)
18–22 May, 2015
Krasnoyarsk, Russia
Sergey I. Donchenko – General Director
Oleg V. Denisenko – Deputy General Director Head of Department
Contents
•  General requirements for GLONASS time-frequency assurance
complex.
•  Current state of GLONASS time-frequency assurance complex
•  Development perspectives for GLONASS time-frequency assurance
complex:
- time and frequency keeping system development on base of
Rb Fountain;
- optical frequency standard on cold atoms development
•  Stationary and mobile GLONASS metrological assurance complexes
development in the field of radio-technical measurements
•  Conclusion
2
General requirements for GLONASS timefrequency assurance complex for 2016-2020
Planned values
Requirements
Basic
requirements
for 2011
User GLONASS time uncertainty access due to
the space segment
5 ns
2 ns
1 ns
RMS (UTC(SU) – GLO system time)
120 ns
20 ns
4 ns
RMS (UTC– UTC(SU))
10 ns
7 ns
3 ns
3
2012 2013 2014
2015
2016
2017
2018
2019
2020
Current state of GLONASS time-frequency assurance complex
4
National Standard of Time and Frequency
Metrological Cs Fountain
Standard CsFO2
in units ·Е-16
Two-Way Satellite Time and Frequency Transfer equipment of the
National Time, Frequency and ERP determination Service
(time scale difference estimate uncertainty
± 2 ns for the distances up to thousands km)
Mobile system
Stationary system
Uncertainty 5·E-16
5
UTC - UTC(SU) ≤ 7 ns
Mobile time-transfer standard
error less than 2 ns per 24 hours
6
Technical means of the National
Time, Frequency and ERP
determination Service(frequency
stability within 1·E-15 for sample
time 1 day)
Requirements fulfillment for national time scale UTC(SU) and
international time scale UTC steering
UTC(SU) characteristics are on the level of the best UTC realizations
7
Development perspectives for GLONASS time-frequency
assurance complex
8
Time and frequency keeping system scheme on base of Rb
Fountain
9
Time and frequency keeping system development on base of Rb
Fountain for the standards of time and frequency
Optical part
10
Project start date – 07.2012 г.
Project completion date– 12.2016 г.
Spectroscope
3-D model of the optical spectroscope
Four isotopes Sr: 88 (81%), 87 (7%), 86 (10%), 84 (2%)
Cloud formation temperature ~500 0С
11
Optical frequency standard on cold atoms development
Prototype system
Optical system for secondary
cooling
Project start date – 07.2012 г.
Project completion date– 12.2016 г.
12
Results of UTC(SU) and UTC(PTB) comparing using TWSTFT
13
Circular T 322 BIPM (октябрь 2014)
TWSTFT link VNIIFTRI - PTB :
uA < 0,5 ns uB < 1,1 ns
Stationary and mobile GLONASS metrological assurance
complexes development in the field of radio-technical
measurements
Stationary
metrological
assurance complex for
GLONASS passive and
active radio-technical
measurement means
characteristics
evaluation
14
Mobile metrological
assurance complex for
GLONASS passive and
active radio-technical
measurement means
characteristics
evaluation
Stationary
metrological
assurance complex for
navigation satellite
measurement means
characteristics
evaluation
Project start date – 07.2012 г.
Project completion date– 12.2016 г.
Metrological
assurance complex for
navigation equipment
characteristics
evaluation
Metrological assurance complex for GLONASS passive and active
radio-technical measurement means characteristics evaluation
Modernized SLR system for
pseudorange measurements in
the optical range (accuracy 0,2
ns)
15
UTC(SU)
Stationary navigation
parameters measurement
means (accuracy 0,03-0,05 м)
UTC(SU)
Active H-maser
(accuracy
7E-14 for 1 s;
7E-16 for 1 day)
NTFS
UTC(SU)
GLONASS passive radio-technical measurement means calibration
Size 19,5×13,7×8,9 m; reduction of external
electromagnetic interference not less than
80 dB; anechoic factor for the working area
no more than -35 dB in the frequency range
from 1 to 40 GHz; accuracy (RMS) of the
absolute time delay measurement in the
antenna no more than 0,1 ns.
Imitation of GLONASS (L1, L2), GPS (L1,
L2, L5), Galileo (E1, E5ab, E6) signals;
accuracy (RMS) of the absolute time
delay measurement in the receiver no
more than 0,1 ns.
16
Metrological assurance complex for navigation satellite measurement
means characteristics evaluation
Antenna system on base of the 12-m
mirror antenna:
• GLONASS (L1, L3, L3), GPS (L1, L2, L5),
Galileo (E1, E5ab);
• noise quality factor
-  1200 МHz no less than 17 dB/К;
-  1600 МHz no less than 19 dB/К;
• Signal to noise ratio no less than 35-40 дБ
(for L1 range).
17
Metrological assurance complex for navigation equipment
characteristics evaluation
Radio anechoic chamber, size 19,5×13,7×8,9 m
(Class 1 GOST R 50414-92 level of shielding in
the frequency range from 0,3 to 40 GHz) with
artificial GLONASS/GPS navigation field:
•  24 GLONASS/GPS emitters;
•  6 noise emitters.
Mobile laboratory:
• Coordinate accuracy 0,01 м;
• Speed accuracy 0,01 м/с;
• Angle accuracy 6’.
18
Conclusion
1.  Time-frequency and metrological assurance complexes
development for GLONASS system is an extremely
important task for the development of the national global
navigation system.
2.  New generation of time and frequency standards being
developed on base of the cold atoms “fountain” and on
the use of the atoms optical cooling technology are on the
front line of the scientific development in the field of time
and frequency measurements.
19
Thank you for
attention!
«Russian Metrological Institute of
Technical Physics and Radio
Engineering»
FSUE “VNIIFTRI”
141570, Moscow region, Mendeleevo
Tel: (495) 526-63-00
Fax: (495) 660-00-92
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