SIM/AM Sistema de Informações Municipais Acompanhamento Mensal
Sistema Sim Tiempo
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Transcript of Sistema Sim Tiempo
J. Mauricio Lopez R.a, Michael A. Lombardib, Andrew N. Novickb, Jean-Simon Boulangerc,Raymond Pelletierc, Carlos Donado M.d, and Ricardo Carvalho e
a Centro Nacional de Metrología (CENAM), Querétaro, Mexico, [email protected] National Institute of Standards and Technology, Boulder, Colorado, United States, [email protected]
c National Research Council (NRC), Ottawa, Canada, [email protected] Centro Nacional de Metrología de Panamá (CENAMEP), Panama City, Panama
e Observatorio Nacional, Rio de Janeiro, Brazil
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
1. Motivations1. Motivations
2. The GPS system2. The GPS system
3. SIM time and frequency network3. SIM time and frequency network
4. SIM and BIPM comparisons4. SIM and BIPM comparisons
5. Conclusions and near future work5. Conclusions and near future work
OutlineOutline
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
NoYesNoGuatemala
NoYesMemberVenezuela
NoInterestedMemberUruguay
YesYesMemberUnited States
NoInterestedNoTrinidad / Tobago
NoInterestedNoPeru
NoInterestedNoParaguay
YesYesAssociatePanama
YesYesMemberMexico
NoYesAssociateJamaica
NoInterestedNoEl Salvador
NoYesAssociateEcuador
NoUnknownMemberDominican Rep.
NoYesAssociateCosta Rica
NoYesNoColombia
YesYesMemberChile
YesYesMemberCanada
YesYesMemberBrazil
YesYesMemberArgentina
Submits to BIPM?
Maintains Time and Freq. Lab?
BIPM/CGPMMember?
Country
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
-GPS stands for Global Positioning System--Space-based radio positioning system
-Provides users with highly accurate position, velocity, and time data
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
24 satelites with atomicclocks on board
semi-synchronous orbit height of 4.2 earth radii (~20,200 km)
6 orbital planes, 55 degrees inclination to equatorial plane
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Operates on two L-band frequencies 1.57542 GHz and 1.2276 GHz
At least four satellites always in view
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
GPS satellite with an
“Slave” oscillator on earth
atomic clock on board
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Velocity of propagation is not constant along the path
Troposphere
Ionosphere
GPS Receiver
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
15 hours
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
300
200
100
0
-100
-200
-300
-400
-500
-6007954.007 7963.504 7979.935 7989.824 7998.822 8009.182
nano
seco
nds
Modified Julian Day - 40000 (Thousands)
March 25th,1990
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Oscillator in common view
Propagation media
Oscillator 1 Oscillator 2
Variation on the velocity of propagation introduces a uncertainty which is usually a few nanoseconds
L >> 10 km
L < 10 km
Troposphere
Ionosphere
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Técnica de COMMON-VIEW
Clock A
Clock B
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the AmericasTécnica de COMMON-VIEW
GPS-A receiver
GPS-B receiver
Common agenda to “view” GPS satellites
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the AmericasTécnica de COMMON-VIEW
∆tA= tA – tGPS ± εA
∆tB= tB – tGPS ± εB
∆tBA = ∆tB - ∆tA =(tB-tGPS + εB) – (tA – tGPS + εA) = tB - tA ± (εB + εA)
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
NRCNRC
NISTNIST
CENAMCENAM
CENAMEPCENAMEP
ONRJONRJ
ICEICE
SICSIC
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
INTIINTI
SIM GPS system
- Multichannel (8) GPS receiver
- SIM receiver sends data automatically to the SIM server every 10 minutes
- includes SIM’s own software (developed by NIST)
- Includes a PC. It is able to show common view results in near real time among participating laboratories
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
SIM GPS antenna
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Novatel antenna
Rejects multiple reflections of theGPS signal
SIM Network server
tf.nist.gov/sim/
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
SIM Time and Frequency comparison network: a democratic system
Comparison between NIST and CENAM
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Comparison between NIST and CENAM
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Comparison between NRC and ONRJ
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Comparison between NRC and ONRJ
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
-4900
-4850
-4800
-4750
-4700
-4650
-4600
-4550
-4500
-4450
53790 53800 53810 53820 53830 53840 53850 53860
Modified Julian Dates
Nan
osec
onds
SIM NetworkCircular-T
-30
-20
-10
0
10
20
30
40
53790 53800 53810 53820 53830 53840 53850 53860
Modified Julian Dates
Nan
osec
onds
SIM NetworkCircular-T
-30
-20
-10
0
10
20
30
40
53790 53800 53810 53820 53830 53840 53850 53860
Modified Julian Dates
Nan
osec
onds
SIM NetworkCircular-T
-4950
-4900
-4850
-4800
-4750
-4700
-4650
-4600
-4550
-4500
-4450
53790 53800 53810 53820 53830 53840 53850 53860Modified Julian Dates
Nan
osec
onds
SIM NetworkCircular-T
-4950
-4900
-4850
-4800
-4750
-4700
-4650
-4600
-4550
-4500
53790 53800 53810 53820 53830 53840 53850 53860
Modified Julian Dates
Nan
osec
onds
SIM NetworkCircular-T
-20
-10
0
10
20
30
40
50
60
53790 53800 53810 53820 53830 53840 53850 53860
Modified Julian Dates
Nan
osec
onds
SIM NetworkCircular-T
UTC(NIST) − UTC(CNMP).UTC(CNM) − UTC(CNMP).
UTC(NIST) − UTC(CNM).
UTC(CNM) − UTC(NRC).
UTC(NRC) − UTC(CNMP).
UTC(NIST) − UTC(NRC).
60 days
350
ns
60 days
60 days
60 days
60 days
60 days
50 n
s50
ns
400
ns35
0 ns
60 n
s
BIPMBIPMSIMSIM
Summary of uncertainties (in nanoseconds) for all six comparisons (March-April 2006)
12.914.014.013.513.113.5UC, k = 2
0.050.050.050.050.050.05UB, Resolution
0.50.50.50.50.50.5UB, Ref. delay
1.5332.51.52UB, Ionosphere
222222UB, Multipath
333333UB, Environment
333333UB, Coordinates
444444UB, Calibration
11.51.51.41.21.8UA, σx(τ)
+21.2−4702.8−4680.7+11.0+10.3−4690.4Mean Time Offset
−7.7 × 10-15−6.3 × 10-14−7.0 × 10-14−4.8 × 10-15−2.8 × 10-15−6.7 × 10-14Mean Freq. Offset
2471.33989.04194.93520.72198.92544.0Baseline (km)
NIST − NRCNRC − CNMPNIST − CNMPCNM − NRCNIST − CNMCNM − CNMP
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Conclusions
2. The network is expected to enhance time and frequency Metrology capabilitieson the SIM region by providing NMIs with a convenient way to compare their standards and to establish traceability to the SI.
3. Due to the SIM T&F Network some labs are in the process of acquiring Csclocks.
4. The SIM network produces results that agree closely with results published in the BIPM’s Circular-T, but have the distinct advantage of being available in near real time.
5. New labs will be joining the network during the next weeks or months (Argentina, Guatemala and …)
1. The SIM time and frequency network began operation in June 2005. Currently 7 NMIs are in participation.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
Conclusions
3. Due to the SIM T&F Network some labs are in the process of acquiring Cs clocks.
4. The SIM network produces results that agree closely with results published in the BIPM’s Circular-T, but have the distinct advantage of being available in near real time.
5. New labs will be joining the network during the next weeks or months (Argentina, Guatemala and …)
1. The SIM time and frequency network began operation in June 2005. Currently 7 NMIs are in participation.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
2. The network is expected to enhance time and frequency Metrology capabilities on the SIM region by providing NMIs with a convenient way to compare their standards and to establish traceability to the SI.
Conclusions
3. Due to the SIM T&F Network some labs are in the process of acquiring Cs clocks.
4. The SIM network produces results that agree closely with results published in the BIPM’s Circular-T, but have the distinct advantage of being available in near real time.
5. New labs will be joining the network during the next weeks or months (Argentina, Guatemala and …)
1. The SIM time and frequency network began operation in June 2005. Currently 7 NMIs are in participation.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
2. The network is expected to enhance time and frequency Metrology capabilitieson the SIM region by providing NMIs with a convenient way to compare their standards and to establish traceability to the SI.
Conclusions
3. Due to the SIM T&F Network some labs are in the process of acquiring Csclocks.
4. The SIM network produces results that agree closely with resultspublished in the BIPM’s Circular-T, but have the distinct advantage of being available in near real time.
5. New labs will be joining the network during the next weeks or months (Argentina, Guatemala and …)
1. The SIM time and frequency network began operation in June 2005. Currently 7 NMIs are in participation.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
2. The network is expected to enhance time and frequency Metrology capabilitieson the SIM region by providing NMIs with a convenient way to compare their standards and to establish traceability to the SI.
Conclusions
3. Due to the SIM T&F Network some labs are in the process of acquiring Csclocks.
4. The SIM network produces results that agree closely with results published in the BIPM’s Circular-T, but have the distinct advantage of being available in near real time.
5. New labs will be joining the network during the next weeks or months (Argentina, Guatemala and …)
1. The SIM time and frequency network began operation in June 2005. Currently 7 NMIs are in participation.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
2. The network is expected to enhance time and frequency Metrology capabilitieson the SIM region by providing NMIs with a convenient way to compare their standards and to establish traceability to the SI.
Conclusions
6. Measurement results produced by the SIM T&F network will be used in the near future to generate a virtual time scale called SIM-time. SIM-time will be a time scale with very high metrological characteristics (accuracy and stability) accessible in real time. CENAM is developing an algorithm to generate the SIM-time scale starting on the second part of 2008.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
7. Improvement of time and frequency capabilities can be observed at SIM as result of the SIM T&F network. However, it is necessary to continue supporting Time and Frequency activities in the SIM region not only providing more SIM type GPS receivers but also with training courses to those countries interested on improving their T&F laboratories or establishing their own one.
8. Enhanced time and frequency capabilities on SIM laboratories along with the SIM-time scale will help to pave the way to improve Metrology and provide a better support to industry in the Americas.
Conclusions
6. Measurement results produced by the SIM T&F network will be used in the near future to generate a virtual time scale called SIM-time. SIM-time will be a time scale with very high metrological characteristics (accuracy and stability) accessible in real time. CENAM is developing an algorithm to generate the SIM-time scale starting on the second part of 2008.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
7. Improvement of time and frequency capabilities can be observed at SIM as result of the SIM T&F network. However, it is necessary to continue supporting Time and Frequency activities in the SIM region not only providing more SIM type GPS receivers but also with training courses to those countries interested on improving their T&F laboratories or establishing their own one.8. Enhanced time and frequency capabilities on SIM laboratories along with the SIM-time scale will help to pave the way to improve Metrology and provide a better support to industry in the Americas.
Conclusions
6. Measurement results produced by the SIM T&F network will be used in the near future to generate a virtual time scale called SIM-time. SIM-time will be a time scale with very high metrological characteristics (accuracy and stability) accessible in real time. CENAM is developing an algorithm to generate the SIM-time scale starting on the second part of 2008.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
7. Improvement of time and frequency capabilities can be observed at SIM as result of the SIM T&F network. However, it is necessary to continue supporting Time and Frequency activities in the SIM region not only providing more SIM type GPS receivers but also with training courses to those countries interested on improving their T&F laboratories or establishing their own one.
8. Enhanced time and frequency capabilities on SIM laboratories along with the SIM-time scale will help to pave the way to improve Metrology and provide a better support to industry in the Americas.
TIME AND FREQUENCY METROLOGY WORKING GROUPWorking to support time and frequency metrology throughout the Americas
J. Mauricio Lopez R.a, Michael A. Lombardib, Andrew N. Novickb, Jean-Simon Boulangerc,Raymond Pelletierc, Carlos Donado M.d, and Ricardo Carvalho e
a Centro Nacional de Metrología (CENAM), Querétaro, Mexico, [email protected] National Institute of Standards and Technology, Boulder, Colorado, United States, [email protected]
c National Research Council (NRC), Ottawa, Canada, [email protected] Centro Nacional de Metrología de Panamá (CENAMEP), Panama City, Panama
e Observatorio Nacional, Rio de Janeiro, Brazil
Thank you for your attention
Thank you for your attention