CIRCULAR T 401 ISSN 1143-1393
2021 JUNE 11, 12h UTC
BUREAU INTERNATIONAL DES POIDS ET MESURES
THE INTERGOVERNMENTAL ORGANIZATION ESTABLISHED BY THE METRE CONVENTION
PAVILLON DE BRETEUIL F-92312 SEVRES CEDEX TEL. +33 1 45 07 70 70 tai@bipm.org

The contents of the sections of BIPM Circular T are fully described in the document " Explanatory supplement to BIPM Circular T "
available at https://webtai.bipm.org/ftp/pub/tai/other-products/notes/explanatory_supplement_v0.4.pdf

1 - Difference between UTC and its local realizations UTC(k) and corresponding uncertainties. From 2017 January 1, 0h UTC, TAI-UTC = 37 s.
Date 2021 0h UTC APR 30 MAY 5 MAY 10 MAY 15 MAY 20 MAY 25 MAY 30 Uncertainty/ns Notes
MJD 59334 59339 59344 59349 59354 59359 59364 uA uB u
Laboratory k [UTC-UTC(k)]/ns
AGGO (La Plata) -858.7 -869.3 -849.4 -823.5 -813.5 -809.6 1.0 20.0 20.0 (1)
AOS (Borowiec) -2.4 -2.7 -3.0 -3.3 -3.8 -4.0 -4.6 0.3 2.9 2.9
APL (Laurel) 0.9 1.2 1.7 -0.7 -0.5 -0.3 -0.2 0.3 19.5 19.5
AUS (Sydney) -498.3 -474.8 -477.0 -489.5 -480.0 -473.7 -462.8 0.3 11.2 11.2
BEV (Wien) 11.2 9.9 13.1 12.9 5.8 3.7 2.7 0.3 3.3 3.3
BFKH (Budapest) - 2547.4 2571.0 2595.2 2625.1 2649.2 2679.8 1.5 20.0 20.1
BIM (Sofiya) 14585.9 14594.8 14629.1 14645.8 14673.5 14684.0 14690.1 0.3 7.1 7.2
BIRM (Beijing) -3.6 -2.7 -1.5 7.0 7.9 4.3 0.5 0.7 2.8 2.9 (2)
BOM (Skopje) - - - - - - -
BY (Minsk) 1.1 0.1 -0.4 -0.9 -0.5 0.3 0.6 1.5 12.1 12.2
CAO (Cagliari) -27196.8 -27304.7 -27410.9 -27523.9 -27636.3 -27750.9 -27864.1 1.5 20.0 20.1
CH (Bern-Wabern) 0.8 1.8 2.1 2.8 3.4 3.0 2.8 0.3 1.4 1.4
CNES (Toulouse) 4.1 4.1 3.5 1.3 -3.6 -6.0 -8.4 0.3 2.9 2.9
CNM (Queretaro) -0.1 3.3 0.9 5.5 6.1 6.2 -4.9 4.0 11.2 11.9
CNMP (Panama) 13.5 3.1 3.9 6.1 8.7 8.2 5.8 0.7 7.4 7.5
DFNT (Tunis) 6615.9 6894.1 7149.7 7398.8 7642.3 7908.0 8136.1 0.7 20.0 20.0
DLR (Oberpfaffenhofen) - - - - - - -
DMDM (Belgrade) -22.0 -23.8 -25.8 -17.8 -14.5 -6.9 3.2 0.3 3.4 3.4
DTAG (Frankfurt/M) -1.5 -1.4 -1.8 -1.0 2.0 11.5 7.7 0.3 2.9 2.9
EIM (Thessaloniki) 6.4 10.7 3.6 2.9 15.0 -1.3 1.9 4.0 11.2 11.9
ESTC (Noordwijk) -0.2 -0.5 -1.2 -1.3 -1.4 -1.0 -0.4 0.3 2.8 2.8
HKO (Hong Kong) - - - 35.3 -60.3 -143.9 -228.7 0.5 3.0 3.1
ICE (San Jose) 62.2 53.1 77.7 77.2 66.5 52.1 33.2 2.5 20.0 20.2
IDN (Serpong-Tangerang) 374.2 360.1 387.7 419.6 423.5 438.1 441.7 0.3 2.9 2.9
IFAG (Wettzell) -821.7 -822.9 -829.4 -831.1 -838.4 -841.5 -839.5 0.3 2.8 2.8
IGNA (Buenos Aires) - - - 6473.6 6523.8 6578.6 6631.4 2.5 20.0 20.2
IMBH (Sarajevo) 1.2 -0.3 2.2 0.3 0.7 -1.7 -0.6 0.7 2.8 2.9
INCP (Lima) -196.3 -219.0 -209.8 -206.2 -223.1 -22.8 - 5.0 20.0 20.6
INM (Bogota D.C.) 157.5 162.0 168.0 172.9 178.1 182.5 - 1.5 20.0 20.1
INPL (Jerusalem) 42.7 36.1 20.8 13.9 7.3 0.5 -10.0 0.3 7.3 7.3
INTI (Buenos Aires) -37.8 -4.7 -30.0 66.1 49.4 59.2 90.6 0.3 20.0 20.0
INXE (Rio de Janeiro) -75.0 -70.5 -48.8 -30.1 -12.3 24.7 53.3 0.3 2.8 2.8
IPQ (Caparica) 353.3 357.5 358.1 367.4 367.4 376.4 373.9 0.3 20.0 20.0
IT (Torino) 1.1 2.1 2.7 2.7 3.0 2.4 3.6 0.3 1.4 1.4
JATC (Lintong) 3.0 3.2 2.6 1.8 1.8 2.5 2.6 0.3 2.9 2.9
JV (Kjeller) -2.3 -9.4 -12.3 -17.2 -23.0 -30.1 -36.1 0.3 4.3 4.3
KRIS (Daejeon) 1.5 -0.3 -0.6 -0.4 0.6 1.8 2.7 0.3 3.2 3.2
LRTE (Sao Carlos) -11.0 -16.4 -15.8 -15.6 -12.1 -14.5 -4.8 0.3 20.0 20.0
LT (Vilnius) 791.3 800.8 806.1 816.3 805.4 815.6 824.7 0.3 2.9 2.9
LUX (Belvaux) 7.0 5.1 11.1 5.9 -2.9 -9.4 -16.9 0.3 3.0 3.0
LV (Riga) -372.4 - -375.3 -375.5 - -382.1 -397.5 1.5 12.2 12.3
MASM (Bayanzurkh) -715.3 -698.1 -686.9 -685.6 -85.3 -190.6 -299.7 0.3 2.9 2.9 (3)
MBM (Podgorica) 197.0 202.9 210.2 216.3 240.2 258.6 - 1.5 20.0 20.1
MIKE (Espoo) 2.2 1.9 1.6 1.5 1.3 1.1 1.0 0.3 2.8 2.8
MSL (Lower Hutt) 9.0 22.1 15.8 32.4 34.4 17.2 2.3 1.5 20.0 20.1
NAO (Mizusawa) 305.4 305.2 302.1 307.6 310.9 312.3 318.2 2.0 20.0 20.1
NICT (Tokyo) -8.7 -3.0 -2.1 -3.7 -3.9 -5.5 -5.7 0.3 2.1 2.1
NIM (Beijing) 1.4 1.3 1.0 0.9 0.5 0.5 0.5 0.3 2.1 2.1
NIMB (Bucharest) -459.0 -30.7 -31.4 -387.9 -739.4 -1096.2 -1442.1 0.3 7.4 7.5
NIMT (Pathumthani) 98.1 93.8 86.9 81.6 80.5 78.9 75.0 0.7 20.0 20.0
NIS (Cairo) -14.7 -9.1 -6.7 -8.3 -14.8 -17.4 - 0.7 20.0 20.0
NIST (Boulder) 1.9 2.2 2.0 1.7 0.6 -0.6 -1.5 0.3 2.2 2.2
NMIJ (Tsukuba) -2.2 -4.4 -5.0 -4.2 -4.1 -3.9 -3.2 0.3 3.4 3.4
NMLS (Sepang) -1136.5 -1144.2 -1167.2 -1167.0 -1156.5 -1149.2 -1162.5 1.5 3.4 3.7
NPL (Teddington) -0.9 -1.2 -1.9 -2.5 -0.8 -1.3 -1.0 0.3 1.4 1.4
NPLI (New-Delhi) 1.0 0.8 0.8 0.5 0.2 0.3 0.5 0.3 2.9 2.9
NRC (Ottawa) 19.0 19.1 19.4 19.8 20.4 21.2 22.2 0.3 3.1 3.1
NRL (Washington DC) 4.0 -1.6 -3.1 1.8 4.1 -2.5 -3.1 0.3 19.7 19.7
NSAI (Dublin) -260.7 - -269.8 -272.8 -273.3 -268.7 -273.4 0.4 7.1 7.2
NTSC (Lintong) 3.7 3.7 3.1 2.1 1.5 1.5 1.6 0.3 2.7 2.7
ONBA (Buenos Aires) 1054.9 1076.2 1100.1 1111.4 1125.8 1147.0 1159.0 2.0 11.2 11.4
ONRJ (Rio de Janeiro) -1.7 4.2 -1.8 2.3 -5.9 -8.1 2.9 0.3 20.0 20.0
OP (Paris) 0.1 0.2 0.8 0.6 0.5 0.0 0.0 0.3 1.3 1.4
ORB (Bruxelles) 2.9 3.0 3.0 2.5 1.8 1.9 1.6 0.3 2.8 2.8
PL (Warszawa) 5.1 4.9 4.7 4.5 3.8 3.4 2.6 0.4 2.8 2.9
PTB (Braunschweig) 0.1 0.0 0.0 -0.2 -0.2 -0.2 -0.2 0.1 0.8 0.8
ROA (San Fernando) -3.5 -4.1 -3.7 -3.6 -3.6 -3.3 -3.4 0.3 1.4 1.4
SASO (Riyadh) -2220.2 -2232.7 -2249.4 -2257.0 -2274.2 -2291.7 -2303.6 0.7 3.1 3.2
SCL (Hong Kong) 16.0 15.6 1.8 2.0 -7.4 -17.1 -26.3 0.3 3.0 3.0
SG (Singapore) 1.2 14.2 3.1 -0.2 -6.1 -2.7 2.2 0.3 2.9 2.9
SIQ (Ljubljana) 557.9 563.2 593.1 626.4 626.4 644.7 - 0.3 3.7 3.7
SL (Colombo) 41.4 46.7 48.1 54.4 54.4 52.5 53.9 0.3 2.8 2.8
SMD (Bruxelles) -6.6 -5.2 -3.1 -1.5 -2.7 -1.0 -1.1 0.3 3.2 3.2
SMU (Bratislava) 76.4 60.6 50.7 47.2 35.4 28.5 34.1 1.5 12.2 12.3
SP (Boras) 1.4 1.5 1.4 1.1 1.0 0.8 0.6 0.3 1.3 1.3
SU (Moskva) 2.2 2.2 2.1 1.9 1.8 1.7 1.5 0.3 2.1 2.1
TL (Chung-Li) 3.2 3.0 2.7 2.8 2.4 2.0 1.7 0.3 2.1 2.2
TP (Praha) -22.1 -19.6 -24.6 -13.1 -14.9 -11.1 -7.3 0.3 2.8 2.8
UA (Kharkov) 3.2 -10.9 -11.1 -9.6 -6.0 -5.9 1.7 3.0 7.1 7.7
UAE (Abu Dhabi) 13.5 5.8 11.0 14.3 26.3 13.5 1.2 4.0 7.6 8.6
UME (Gebze-Kocaeli) 15.8 18.7 17.7 15.7 13.7 9.2 5.6 0.3 3.4 3.4
USNO (Washington DC) 0.6 0.6 1.0 0.5 0.4 -0.5 -1.6 0.2 1.5 1.5
VMI (Ha Noi) 14.6 8.6 2.9 11.1 6.2 -2.8 -10.2 0.3 7.1 7.2
VSL (Delft) -1.5 -12.2 -6.2 -1.0 -0.4 -4.3 0.0 0.3 1.4 1.4
ZA (Pretoria) 1.7 3.7 5.3 6.4 4.3 -1.4 -5.9 0.3 2.9 2.9
- Notes on section 1:
(1) AGGO : Argentinean-German Geodetic Observatory, La Plata, Argentina. Formerly TCC (2014).
(2) BIRM : Apparent time step of UTC(BIRM) of -8.5 ns on MJD 59347.
(3) MASM : Apparent time step of UTC(MASM) of -600 ns on MJD 59351.

2 - Difference between the normalized frequencies of EAL and TAI.
Interval of validity f(EAL)-f(TAI)
Steering correction 59334 - 59364 6.501x10-13 (2021 APR 30 - 2021 MAY 30)
New correction 59364 - 59394 6.501x10-13 (2021 MAY 30 - 2021 JUN 29)
New correction foreseen 59394 - 59424 6.501x10-13 (2021 JUN 29 - 2021 JUL 29)

3 - Duration of the TAI scale interval d.

Table 1: Estimate of d by individual PSFS measurements and corresponding uncertainty.
All values are expressed in 10-15 and are valid only for the stated period of estimation.
Standard Period of d uA uB uA/Lab uB/Lab ul/Tai u uSrep Ref(uS) Ref(uB) uB(Ref) Uptime LastRep Nrep3y Steer Note
Estimation %
PTB-CS1 59334 59364 -17.47 8.00 8.00 0.00 0.00 0.07 11.31 PFS/NA T148 8.00 100.0 T400 36 Y (1)
PTB-CS2 59334 59364 -9.87 5.00 12.00 0.00 0.00 0.07 13.00 PFS/NA T148 12.00 100.0 T400 35 Y (1)
NPL-CsF2 59334 59364 -0.19 0.19 0.20 0.01 0.03 0.20 0.34 PFS/NA T284 0.23 98.6 T400 15 Y (2)
NRC-FCs2 59334 59364 0.57 0.11 0.21 0.10 0.00 0.20 0.32 PFS/NA T389 0.23 98.6 T400 18 Y (3)
SYRTE-FO2 59334 59349 -0.32 0.30 0.22 0.06 0.00 0.37 0.52 PFS/NA T301 0.23 93.7 T400 35 Y (4)
SYRTE-FORb 59334 59354 -0.06 0.25 0.25 0.05 0.00 0.28 0.46 0.6 [1] T328 0.34 97.7 T400 35 Y (4)
PTB-CSF1 59334 59364 0.03 0.07 0.28 0.02 0.00 0.07 0.30 PFS/NA T371 0.28 95.4 T400 28 Y (5)
PTB-CSF2 59334 59364 -0.16 0.10 0.17 0.01 0.00 0.07 0.21 PFS/NA T370 0.17 96.3 T400 39 Y (5)
SU-CsFO2 59334 59344 0.09 0.51 0.22 0.12 0.00 0.53 0.77 PFS/NA T315 0.50 85.8 T400 31 Y (6)

Notes:
(1) Continuously operating as a clock participating to TAI
(2) Report 03 JUN. 2021 by NPL
(3) Report 01 JUN. 2021 by NRC
(4) Report 04 JUN. 2021 by LNE-SYRTE
(5) Report 04 JUN. 2021 by PTB
(6) Report 04 JUN. 2021 by SU
[1] CCTF Recommendation 2 (2017) : Updates to the CIPM list of standard frequencies in Consultative
Committee for Time and Frequency Report of the 21st meeting (2017), 2017, 56 p.

Erratum Circular T 400:
The evaluation of d for NPL-CsF2 in Circular T 400 (period 59304-59334) is -0.19 (instead of 0.69),
after correcting the effect of a calibration change during the period. Corrected entry should read:

Standard Period of d uA uB uA/Lab uB/Lab ul/Tai u uSrep Ref(uS) Ref(uB) uB(Ref) Uptime LastRep Nrep3y Steer Note
Estimation %
NPL-CsF2 59304 59334 -0.19 0.17 0.20 0.01 0.03 0.20 0.33 PFS/NA T284 0.23 99.3 T399 14 Y


Table 2: Estimate of d by the BIPM based on all PSFS measurements identified to be used for TAI steering
over the period MJD 58974-59364, and corresponding uncertainties.

Period of estimation d u
59334-59364 -0.02x10-15 0.13x10-15 (2021 APR 30 - 2021 MAY 30)

4 - Relations of UTC and TAI with predictions of UTC(k) disseminated by GNSS.

[UTC-UTC(USNO)_GPS] = C0', [TAI-UTC(USNO)_GPS] = 37 s + C0'
[UTC-UTC(SU)_GLONASS]= C1', [TAI-UTC(SU)_GLONASS]= 37 s + C1'

For this edition of Circular T, σ0'= 0.7 ns, σ1'= 6.8 ns

2021 0h UTC MJD C0'/ns N0 C1'/ns N1'
APR 30 59334 0.7 89 20.2 81
MAY 1 59335 0.9 89 20.8 86
MAY 2 59336 1.5 90 21.8 87
MAY 3 59337 2.0 91 20.9 89
MAY 4 59338 2.2 90 20.1 86
MAY 5 59339 1.9 89 21.0 89
MAY 6 59340 1.2 89 19.0 88
MAY 7 59341 2.0 90 17.5 88
MAY 8 59342 3.5 89 18.8 80
MAY 9 59343 4.7 89 19.6 83
MAY 10 59344 3.5 89 21.4 89
MAY 11 59345 0.8 90 22.4 89
MAY 12 59346 1.1 89 23.2 88
MAY 13 59347 1.1 89 26.2 87
MAY 14 59348 2.2 89 31.3 83
MAY 15 59349 3.2 90 35.8 88
MAY 16 59350 2.9 89 36.8 78
MAY 17 59351 1.5 89 34.6 81
MAY 18 59352 2.2 89 24.3 88
MAY 19 59353 1.5 90 11.4 90
MAY 20 59354 -0.3 89 6.6 84
MAY 21 59355 -1.3 89 6.7 87
MAY 22 59356 0.3 89 7.6 82
MAY 23 59357 2.3 90 5.4 89
MAY 24 59358 -0.3 89 2.8 77
MAY 25 59359 -0.9 89 11.4 87
MAY 26 59360 -1.0 89 18.3 87
MAY 27 59361 -0.4 90 17.7 88
MAY 28 59362 -1.0 89 21.3 87
MAY 29 59363 -2.6 89 23.0 83
MAY 30 59364 0.1 89 19.5 82

5 - Time links used for the computation of TAI, calibrations information and corresponding uncertainties.

Link Type Equipment Cal_ID1 / Cal_ID2 uStb/ns uCal/ns uAg/ns Al/ns YYMM
AGGO/PTB GPS P3 TC_2 /PT13 NC / 1001-2018 1.0 20.0
AOS /PTB GPSPPP AO_4 /PT13 1014-2018 / 1001-2018 0.3 2.8 1.3
APL /PTB GPSPPP AP04 /PT13 NC / 1001-2018 0.3 20.0
AUS /PTB GPSPPP AU04 /PT13 1002-2010 / 1001-2018 0.3 11.2 10.0
BEV /PTB GPSPPP BE1_ /PT13 1012-2016 / 1001-2018 0.3 3.2 2.1
BFKH/PTB GPS MC MK01 /PT13 NC / 1001-2018 1.5 20.0
BIM /PTB GPSPPP BM51 /PT13 2007-2019 / 1001-2018 0.3 7.1 1.1
BIRM/PTB GPS P3 BI22 /PT13 1016-2018 / 1001-2018 0.7 2.7 1.1
BOM /PTB NL
BY /PTB GPS MC BY46 /PT13 2001-2008 / 1001-2018 1.5 12.2 10.0
CAO /PTB GPS MC CA__ /PT13 NC / 1001-2018 1.5 20.0
CNES/PTB GPSPPP CS21 /PT13 1015-2018 / 1001-2018 0.3 2.8 1.4
CNM /PTB GPS MC CN00 /PT13 NA_Al / 1001-2018 4.0 11.2 10.0 -27.3 0804
CNMP/PTB GPSPPP MP1_ /PT13 NA_Al / 1001-2018 0.7 7.4 2.3 41.7 1607
DFNT/PTB GPS P3 DN__ /PT13 NC_Al / 1001-2018 0.7 20.0 10.3 1507
DLR NL
DMDM/PTB GPSPPP ZM68 /PT13 1011-2016 / 1001-2018 0.3 3.3 2.1
DTAG/PTB GPSPPP DT05 /PT13 1012-2019 / 1001-2018 0.3 2.8 1.0
EIM /PTB GPS MC EI__ /PT13 NA / 4.0 11.2 10.0
ESTC/PTB GPSPPP ES07 /PT13 1013-2020 / 1001-2018 0.3 2.7 1.0
HKO /PTB GPSPPP HKO1 /PT13 1011-2018 / 1001-2018 0.5 2.9 1.5
ICE /PTB GPS MC CE1_ /PT13 NC / 1001-2018 2.5 20.0
IDN /PTB GPSPPP KI01 /PT13 1017-2018 / 1001-2018 0.3 2.8 1.2
IFAG/PTB GPSPPP IF20 /PT13 1014-2020 / 1001-2018 0.3 2.7 1.0
IGNA/PTB GPS MC IG02 /PT13 NC / 1001-2018 2.5 20.0
IMBH/PTB GPS P3 BH02 /PT13 1011-2019 / 1001-2018 0.7 2.7 1.1
INCP/PTB GPS MC CP__ /PT13 NC / 1001-2018 5.0 20.0
INM /PTB GPS MC IC__ /PT13 NC / 1001-2018 1.5 20.0
INPL/PTB GPSPPP IL06 /PT13 2003-2016 / 1001-2018 0.3 7.3 2.0
INTI/PTB GPSPPP INTI /PT13 NC / 1001-2018 0.3 20.0
INXE/PTB GPSPPP NXRA /PT13 1012-2020 / 1001-2018 0.3 2.7 1.0
IPQ /PTB GPSPPP IP05 /PT13 NC / 1001-2018 0.3 20.0
JATC/PTB GPSPPP JA01 /PT13 1201-2018 / 1001-2018 0.3 2.8 1.3
JV /PTB GPSPPP JV02 /PT13 1101-2017 / 1001-2018 0.3 4.3 1.6
KRIS/PTB GPSPPP KRG1 /PT13 1017-2017 / 1001-2018 0.3 3.1 1.8
LRTE/PTB GPSPPP LRRC /PT13 NC / 1001-2018 0.3 20.0
LT /PTB GPSPPP LT02 /PT13 1014-2018 / 1001-2018 0.3 2.8 1.3
LUX /PTB GPSPPP LU01 /PT13 1012-2018 / 1001-2018 0.3 2.9 1.5
LV /PTB GPS MC LV01 /PT13 2001-2007 / 1001-2018 1.5 12.2 10.0
MASM/PTB GPSPPP MN__ /PT13 1019-2018 / 1001-2018 0.3 2.8 1.2
MBM /PTB GPS MC ME01 /PT13 NC_Al / 1001-2018 1.5 20.0 10.0 2104
MIKE/PTB GPSPPP MI04 /PT13 1016-2019 / 1001-2018 0.3 2.7 1.0
MSL /PTB GPS P3 MS0_ /PT13 NC / 1001-2018 1.5 20.0
NAO /PTB GPS MC NAT2 /PT13 NC / 1001-2018 2.0 20.0
NICT/PTB GPSPPP NC4S /PT13 1001-2020 / 1001-2018 0.3 2.0 1.0
NIM /PTB GPSPPP IM06 /PT13 1001-2020 / 1001-2018 0.3 2.0 1.0
NIMB/PTB GPSPPP MB02 /PT13 NA_Al / 1001-2018 0.3 7.4 2.5 32.2 1611
NIMT/PTB GPS P3 MTTI /PT13 NC / 1001-2018 0.7 20.0
NIS /PTB GPS P3 IS__ /PT13 NC_Al / 1001-2018 0.7 20.0 +16.4 1303
NMIJ/PTB GPSPPP NM0D /PT13 1001-2014 / 1001-2018 0.3 3.3 2.7
NMLS/PTB GPS MC LSM1 /PT13 1013-2017 / 1001-2018 1.5 3.3 1.8
NPLI/PTB GPSPPP LI2P /PT13 1013-2018 / 1001-2018 0.3 2.9 1.5
NRC /PTB GPSPPP NRC4 /PT13 1019-2017 / 1001-2018 0.3 3.0 1.7
NRL /PTB GPSPPP RL2_ /PT13 NC / 1001-2018 0.3 20.0
NSAI/PTB GPSPPP IE01 /PT13 2022-2019 / 1001-2018 0.4 7.1 1.0
NTSC/PTB GPSPPP NTP1 /PT13 1001-2016 / 1001-2018 0.3 2.7 2.0
ONBA/PTB GPS MC ON__ /PT13 1002-2004 / 1001-2018 2.0 11.2 10.0
ONRJ/PTB GPSPPP RJ03 /PT13 NC_Al / 1001-2018 0.3 20.0 -11.7 1912
ORB /PTB GPSPPP OR5Z /PT13 1011-2020 / 1001-2018 0.3 2.7 1.0
PL /PTB GPSPPP PL_3 /PT13 1014-2018 / 1001-2018 0.4 2.8 1.3
SASO/PTB GPSPPP SAS0 /PT13 1020-2017 / 1001-2018 0.7 3.0 1.6
SCL /PTB GPSPPP SC05 /PT13 1011-2018 / 1001-2018 0.3 2.9 1.5
SG /PTB GPSPPP SG01 /PT13 1019-2018 / 1001-2018 0.3 2.8 1.2
SIQ /PTB GPSPPP SI01 /PT13 1013-2019 / 1001-2018 0.3 3.6 1.0
SL /PTB GPSPPP SL01 /PT13 1017-2018 / 1001-2018 0.3 2.7 1.1
SMD /PTB GPSPPP SD01 /PT13 1014-2017 / 1001-2018 0.3 3.1 1.8
SMU /PTB GPS MC SM00 /PT13 NA_Al / 1001-2018 1.5 12.2 10.0 57.8 0908
SU /PTB GPSPPP SU31 /PT13 1001-2018 / 1001-2018 0.3 2.2 1.4
TL /PTB GPSPPP TLT1 /PT13 1001-2020 / 1001-2018 0.3 2.0 1.0
TP /PTB GPSPPP TP02 /PT13 1015-2019 / 1001-2018 0.3 2.7 1.1
UA /PTB GPS MC UA05 /PT13 2003-2018 / 1001-2018 3.0 7.1 1.3
UAE /PTB GPS MC AE__ /PT13 2001-2016 / 1001-2018 4.0 7.6 3.0
UME /PTB GPSPPP UM01 /PT13 1011-2016 / 1001-2018 0.3 3.3 2.1
VMI /PTB GPSPPP VM02 /PT13 2001-2019 / 1001-2018 0.3 7.1 1.1
ZA /PTB GPSPPP ZA02 /PT13 1018-2018 / 1001-2018 0.3 2.8 1.2
Link Type Equipment Cal_ID uStb/ns uCal/ns uAg/ns Al/ns YYMM
CH /PTB TWGPPP CH01 /PTB05 0523-2021 0.3 1.1 0.3 (1)
IT /PTB TWGPPP IT02 /PTB05 0502-2019 0.3 1.1 0.5 (1)
NIST/PTB TWGPPP NIST01/PTB05 0393-2015 0.3 2.1 1.6 (1)
NPL /PTB TWGPPP NPL02 /PTB05 0525-2021 0.3 1.1 0.3 (1)
OP /PTB SDGPPP OP01 /PTB05 0503-2019 0.3 1.1 0.5 (2)
ROA /PTB TWGPPP ROA01 /PTB05 0504-2019 0.3 1.1 0.5 (1)
SP /PTB TWGPPP SP01 /PTB05 0496-2019 0.3 1.1 0.5 (1)
USNO/PTB TWGPPP USNO01/PTB05 0395-2016 0.3 1.7 1.2 (1)
VSL /PTB TWGPPP VSL01 /PTB05 0527-2021 0.3 1.1 0.3 (1)
- Notes on section 5:
(1) Two-Way links setup changed on MJD 59361. Therefore all TWGPPP links are driven by PPP for the last date.
(2) A combination SDR-PPP (dubbed SDGPPP) has been computed for the OP-PTB link.