CIRCULAR T 187 ISSN 1143-1393 2003 AUGUST 11, 13h UTC BUREAU INTERNATIONAL DES POIDS ET MESURES ORGANISATION INTERGOUVERNEMENTALE DE LA CONVENTION DU METRE PAVILLON DE BRETEUIL F-92312 SEVRES CEDEX TEL. +33 1 45 07 70 70 FAX. +33 1 45 34 20 21 tai@bipm.org 1 - Coordinated Universal Time UTC and its local realizations UTC(k). Computed values of [UTC-UTC(k)]. From 1999 January 1, 0h UTC, TAI-UTC = 32 s. Date 2003 0h UTC JUN 29 JUL 4 JUL 9 JUL 14 JUL 19 JUL 24 JUL 29 MJD 52819 52824 52829 52834 52839 52844 52849 Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) 79.2 91.8 111.3 112.3 111.1 119.9 127.3 AUS (Sydney) -277.5 -274.2 -293.4 -311.0 -306.4 -325.1 -329.2 BEV (Wien) -8.0 -12.7 -14.3 -12.7 -12.1 -10.5 -6.7 BIRM (Beijing) 1091.3 1100.6 1112.3 1127.3 1128.7 1136.4 1150.9 CAO (Cagliari) -4086.3 -4101.1 -4092.1 -4094.8 -4093.6 -4090.1 -4079.4 CH (Bern) 38.2 39.4 37.5 28.5 30.6 24.4 22.8 CNM (Queretaro) 50.3 53.6 51.5 56.3 57.8 55.1 45.4 CRL (Tokyo) -6.6 -9.6 -8.4 -11.1 -13.8 -13.3 -14.1 CSIR (Pretoria) - -2247.6 -2286.1 -2325.7 -2356.4 -2400.7 -2436.8 DLR (Oberpfaffenhofen) -324.3 -220.2 -115.5 -41.4 -11.3 10.5 6.8 DTAG (Darmstadt) 353.7 338.2 337.6 316.2 325.0 322.8 313.6 IEN (Torino) 45.3 46.9 45.6 48.8 52.9 46.4 51.4 IFAG (Wettzell) -2105.7 -2114.4 -2126.9 -2133.9 -2143.2 -2142.7 -2147.5 IGMA (Buenos Aires) -89.8 -89.5 -81.9 -88.9 -92.0 -90.0 -81.2 INPL (Jerusalem) -8039.3 - -8090.2 -8117.9 -8153.4 -8184.2 -8221.5 IPQ (Monte de Caparica) - - - - - - - JATC (Lintong) -11611.1 -11593.0 -11581.8 -11557.4 -11542.4 -11525.7 -11495.1 JV (Kjeller) -8306.7 -8418.8 -8522.6 -8643.4 -8760.3 -8894.8 -9016.8 KRIS (Daejon) -70.3 -94.8 -119.6 -133.1 -142.4 -160.6 -181.2 LDS (Leeds) 3617.9 3653.9 3672.5 3688.7 3702.4 3732.2 3733.8 LT (Vilnius) -150.1 -170.6 -173.5 -176.9 -166.7 -148.3 -131.5 MSL (Lower Hutt) 182.9 196.8 214.9 235.0 240.3 215.4 219.3 NAO (Mizusawa) 8.8 14.0 15.1 14.0 8.4 9.5 11.6 NIM (Beijing) -2625.4 -2627.0 -2620.2 -2625.1 -2632.2 -2627.9 -2624.9 NIMB (Bucharest) -555.0 -579.3 -599.4 -622.2 -646.4 -663.8 -671.3 NIMT (Bangkok) 50.4 24.1 2.0 -14.9 -19.5 -36.3 -51.1 NIST (Boulder) 9.2 10.3 12.6 11.7 12.7 13.7 10.7 NMC (Sofiya) -2887.4 -2912.7 -2910.4 -2939.7 -2943.2 -2948.1 -2976.5 NMIJ (Tsukuba) -15.1 -15.8 -11.8 -7.9 -6.7 -7.1 -14.9 NMLS (Shah Alam) 400.0 200.1 219.2 226.7 236.6 280.9 298.4 (1) NPL (Teddington) 23.6 21.4 20.6 20.7 20.5 20.7 22.1 NPLI (New-Delhi) - - - - - - - NRC (Ottawa) 17.7 16.0 24.1 30.2 27.7 22.3 27.9 NTSC (Lintong) 33.2 28.8 24.4 27.7 22.0 20.4 23.8 OMH (Budapest) 8040.6 - - 8125.3 8150.2 8174.3 8203.3 ONBA (Buenos Aires) -394.4 -370.9 -475.3 -508.4 -516.5 -551.9 -486.3 ONRJ (Rio de Janeiro) 5566.4 5578.8 5591.0 5601.2 5609.1 5627.0 5629.2 OP (Paris) 47.6 43.0 45.3 45.9 43.3 40.9 37.0 ORB (Bruxelles) -8.4 -14.1 64.2 55.4 23.2 -36.4 -33.4 PL (Warszawa) 2.2 -18.0 -33.5 -43.2 -59.9 -65.4 -75.6 PTB (Braunschweig) -3.7 -6.7 -2.8 -6.4 -9.0 -7.6 -5.3 ROA (San Fernando) 52.2 54.6 55.5 53.1 53.4 59.6 57.7 SCL (Hong Kong) 20.6 29.6 37.4 35.8 29.9 34.3 45.9 SG (Singapore) 298.3 272.6 202.7 126.2 43.6 -17.7 -20.1 SMU (Bratislava) -8319.8 -8350.2 -8381.6 -8411.7 -8448.8 -8466.5 -8494.6 SP (Boras) -133.7 -139.4 -134.6 -128.4 -125.0 -119.8 -105.0 SU (Moskva) 33.5 31.5 32.0 32.5 35.5 30.0 25.6 TCC (Concepcion) -3522.8 -3584.3 -3616.6 -3681.3 -3732.0 -3768.1 -3850.0 TL (Chung-Li) -52.1 -49.3 -45.5 -43.6 -41.1 -41.4 -41.1 TP (Praha) 42.5 51.3 64.8 72.4 69.3 76.8 68.7 UME (Gebze-Kocaeli) -12.8 -20.7 -17.4 -19.2 -9.7 -0.7 -2.3 USNO (Washington DC) -3.4 -1.1 -1.4 -1.3 -2.0 -2.4 -1.8 VSL (Delft) 34.3 39.1 40.6 37.1 31.4 37.3 31.6 - Note on section 1: (1) NMLS: Apparant time step of [UTC - UTC(NMLS)] between MJD 52819 and 52824 due to GPS receiver failure. 2 - International Atomic Time TAI and Local atomic time scales TA(k). Computed values of [TAI-TA(k)]. Date 2003 0h UTC JUN 29 JUL 4 JUL 9 JUL 14 JUL 19 JUL 24 JUL 29 MJD 52819 52824 52829 52834 52839 52844 52849 Laboratory k [TAI-TA(k)]/ns AUS (Sydney) -121917.5 - - - - - - CH (Bern) 33653.2 33826.7 34002.1 34170.3 34349.6 34520.7 34696.3 CRL (Tokyo) 174568.4 174768.5 174968.4 175167.1 175369.7 175572.6 175773.1 F (Paris) 169126.0 169133.9 169145.8 169153.1 169161.6 169171.8 169179.2 IEN (Torino) 28328.3 28447.9 28566.6 28560.8 28677.9 28801.4 28925.4 JATC (Lintong) -30875.1 -30975.0 -31086.8 -31183.4 -31289.4 -31394.7 -31491.1 KRIS (Taejon) 6040.0 6041.4 6062.5 6090.8 6124.3 6152.1 6176.5 NIST (Boulder) -45251385.0 -45251582.6 -45251779.1 -45251978.7 -45252176.5 -45252373.2 -45252573.7 NRC (Ottawa) 28557.2 28559.9 28572.3 28582.6 28584.5 28583.1 28593.7 NTSC (Lintong) 82.5 87.5 90.4 100.9 104.8 111.5 119.6 PL (Warszawa) -1504.8 -1521.0 -1533.5 -1548.2 -1558.9 -1568.4 -1583.6 PTB (Braunschweig) -359464.1 -359462.0 -359453.0 -359451.5 -359449.0 -359442.6 -359435.2 SU (Moskva) 27241033.5 27241031.5 27241032.0 27241032.5 27241035.5 27241030.0 27241025.6 (1) USNO (Washington DC) -34911822.0 -34912130.1 -34912440.6 -34912749.6 -34913059.8 -34913369.5 -34913679.0 - Note on section 2: (1) SU : Listed values are TAI-TA(SU) - 2.80 seconds. 3 - Difference between the normalized frequencies of EAL (free atomic time scale) and TAI. Interval of validity f(EAL)-f(TAI) 2003 May 30 - 2003 Aug 28 52789-52879 6.960x10**-13 No new steering correction foreseen for September 2003 2003 Aug 28 - 2003 Sep 27 52879-52909 6.960x10**-13 4 - Duration of the TAI scale interval. TAI is a realization of coordinate time TT. The following tables give the fractional deviation d of the scale interval of TAI from that of TT (the SI second on the geoid), i.e. the fractional frequency deviation of TAI with the opposite sign: d = -yTAI. In this section, a frequency over a time interval is defined as the ratio of the end-point phase difference to the duration of the interval. Whenever needed, the instability of EAL should be expressed as the quadratic sum of three components with t in days: (1) a white frequency noise of 6.0x10**-15 / sqrt(t), (2) a flicker frequency noise of 0.6x10**-15 and (3) a random walk frequency noise of 1.6x10**-16 x sqrt(t). The relation between EAL and TAI is given in Circular T and the Annual Report of the BIPM Time Section. In the first table, d is obtained, on the given periods of estimation by comparison of the TAI frequency with that of the given individual Primary Frequency Standards (PFS). In this table: uA is the uncertainty originating in the instability of the PFS, uB is the combined uncertainty from systematic effects, Ref(uB) is a reference giving information on the stated value of uB or is the Circular T where this reference was first given, ul/lab is the uncertainty in the link between the PFS and the clock participating to TAI, including the uncertainty due to the dead-time, ul/TAI is the uncertainty in the link to TAI, u is the quadratic sum of all four uncertainty values. All values are expressed in 10**-15. Standard Period of d uA uB Ref(uB) ul/lab ul/TAI u Note estimation SYRTE-FOM 52794 52819 3.9 1.5 0.8 T184 1.0 1.2 2.3 (1) SYRTE-JPO 52824 52834 11.4 1.0 6.5 T160 0.3 3.0 7.2 (2) SYRTE-JPO 52839 52849 16.6 1.0 6.5 T160 0.3 3.0 7.2 (2) PTB-CS1 52819 52849 7.6 5.0 8.0 T148 0.0 1.0 9.5 (3) PTB-CS2 52819 52849 5.8 3.0 12.0 T148 0.0 1.0 12.4 (3) Notes: (1) Report 18 July by BNM-SYRTE. (2) Report 5 August by BNM-SYRTE. (3) Continuously operating as a clock participating to TAI. The second table gives the BIPM estimate of d, based on all available PFS measurements over the period MJD 52459-52849, taking into account their individual uncertainties and characterizing the instability of EAL as noted above. u is the computed standard uncertainty of d. Period of estimation d u 52819-52849 +5.0x10**-15 1.6x10**-15 5 - Relations of UTC and TAI with GPS time and GLONASS time. [UTC-GPS time] = -13 s + C0, [TAI-GPS time] = 19 s + C0, global uncertainty is of order 10 ns. [UTC-GLONASS time] = 0 s + C1, [TAI-GLONASS time] = 32 s + C1, global uncertainty is of order hundreds ns. The C0 values are obtained using the values [UTC-UTC(OP)] and the GPS data taken at the Paris Observatory, corrected for IGS precise orbits and ionosphere maps. The C1 vaules are obtained using the values [UTC-UTC(VSL)] and the GLONASS data taken at the NMi Van Swinden Laboratorium (VSL). The standard deviations S0 and S1 characterize the dispersion of individual measurements. N0 and N1 are the numbers of measurements. For this circular, S0 = 2.9 ns, S1 = 25.9 ns Date 2003 0h UTC MJD C0/ns N0 C1/ns N1 JUN 29 52819 -6.7 43 162.9 32 JUN 30 52820 -3.3 42 134.4 23 JUL 1 52821 -2.7 44 161.3 72 JUL 2 52822 -2.1 44 172.9 37 JUL 3 52823 -5.3 44 167.7 56 JUL 4 52824 -8.3 42 164.3 72 JUL 5 52825 -8.0 42 161.8 61 JUL 6 52826 -5.2 42 161.8 20 JUL 7 52827 -0.7 44 170.2 57 JUL 8 52828 -0.6 43 182.8 37 JUL 9 52829 -1.9 40 144.3 26 JUL 10 52830 -3.0 11 140.4 57 JUL 11 52831 -2.8 37 161.5 62 JUL 12 52832 -4.2 43 158.0 73 JUL 13 52833 -6.6 43 149.0 56 JUL 14 52834 -8.6 43 159.0 21 JUL 15 52835 -6.4 42 156.2 58 JUL 16 52836 -6.1 42 154.3 13 JUL 17 52837 -8.4 39 156.9 61 JUL 18 52838 -11.6 42 146.2 64 JUL 19 52839 -11.0 42 143.1 50 JUL 20 52840 -11.1 43 159.7 60 JUL 21 52841 -12.4 43 156.6 21 JUL 22 52842 -12.4 43 156.2 55 JUL 23 52843 -9.7 42 152.3 53 JUL 24 52844 -10.1 42 149.7 71 JUL 25 52845 -7.9 41 148.1 64 JUL 26 52846 -5.9 41 137.9 54 JUL 27 52847 -1.9 40 132.5 65 JUL 28 52848 -1.3 43 130.9 59 JUL 29 52849 -1.1 41 142.3 42 6 - Time links used for the computation of TAI. The time links used in the elaboration of this Circular T are listed in this section. The type of link is indicated as follows: GPS SC for GPS common-view single-channel C/A data; GPS MC for GPS common-view multi-channel C/A data; GPS P3 for GPS common-view multi-channel dual-frequency P code data; GPS GT for 'GPS time' observations; INT LK for internal cable link and TWSTFT for two-way satellite time and frequency transfer data. Link Type Link Type AOS /NPL GPS MC NPL /PTB TWSTFT AUS /CRL GPS MC NPLI/PTB GPS SC BEV /NPL GPS MC NRC /USNO GPS SC BIRM/CRL GPS MC NTSC/CRL TWSTFT CAO /PTB GPS SC OMH /PTB GPS SC CH /PTB GPS SC ONBA/USNO GPS MC CNM /NIST GPS SC ONRJ/NIST GPS SC CRL /PTB GPS SC OP /PTB GPS SC CSIR/NPL GPS MC ORB /PTB GPS SC DLR /PTB GPS P3 PL /NPL GPS MC DTAG/PTB GPS SC IEN /PTB TWSTFT ROA /PTB TWSTFT IFAG/PTB GPS SC SCL /CRL GPS SC IGMA/NIST GPS GT SG /CRL GPS MC INPL/PTB GPS SC SMU /PTB GPS SC IPQ /PTB GPS SC SP /PTB GPS SC JATC/NTSC INT LK SU /PTB GPS SC JV /PTB GPS GT TCC /NIST GPS SC KRIS/CRL GPS SC TL /CRL TWSTFT LDS /PTB GPS SC TP /PTB GPS SC LT /NPL GPS MC UME /PTB GPS SC MSL /CRL GPS MC USNO/PTB TWSTFT NAO /CRL GPS SC VSL /PTB TWSTFT NIM /CRL GPS SC NIMB/PTB GPS SC NIMT/CRL GPS MC NIST/PTB GPS SC NMC /PTB GPS GT NMIJ/CRL TWSTFT NMLS/CRL GPS MC