CIRCULAR T 261 ISSN 1143-1393 2009 OCTOBER 12, 10h 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)] and uncertainties valid for the period of this Circular. From 2009 January 1, 0h UTC, TAI-UTC = 34 s. Date 2009 0h UTC AUG 31 SEP 5 SEP 10 SEP 15 SEP 20 SEP 25 SEP 30 Uncertainty/ns Notes MJD 55074 55079 55084 55089 55094 55099 55104 uA uB u Laboratory k [UTC-UTC(k)]/ns AOS (Borowiec) 5.0 4.8 4.8 3.7 4.4 4.5 4.7 1.5 5.1 5.4 APL (Laurel) 22.5 16.6 25.0 10.2 -7.5 -15.6 -7.4 1.5 5.1 5.3 AUS (Sydney) 1005.0 1013.5 1017.8 1027.1 1024.6 989.0 969.9 1.5 5.1 5.3 BEV (Wien) 26.7 17.4 19.8 26.0 29.4 27.1 32.6 1.5 3.2 3.6 BIM (Sofiya) -7055.5 -7050.0 -7034.4 -7030.0 -7029.4 -7031.1 -7038.9 2.0 7.1 7.4 BIRM (Beijing) -8574.3 -8606.7 -8644.8 -8684.6 -8724.3 -8766.6 -8814.9 2.0 20.0 20.1 BY (Minsk) -8.2 0.8 18.2 24.8 32.7 44.2 42.6 2.0 7.1 7.4 CAO (Cagliari) -3376.2 -3406.5 -3412.4 -3435.9 -3468.7 -3471.2 -3471.9 1.5 7.1 7.2 CH (Bern) -4.8 -3.4 -6.0 -7.0 -11.1 -9.0 -3.7 0.5 1.6 1.7 (1) CNM (Queretaro) -9.9 -10.0 -8.6 -14.4 -11.0 -18.5 -21.3 2.5 5.1 5.7 CNMP (Panama) 20.1 25.6 23.9 10.6 -3.8 11.0 12.9 3.0 5.1 6.0 DLR (Oberpfaffenhofen) 3.3 7.8 15.8 26.3 24.8 30.0 32.8 0.4 7.0 7.0 DMDM (Belgrade) 5836.5 5851.9 5866.9 5892.2 5928.9 5962.4 5999.0 2.0 7.1 7.4 (2) DTAG (Frankfurt/M) -191.5 -191.8 -223.2 -245.8 -264.3 -272.4 -288.4 1.5 10.0 10.1 EIM (Thessaloniki) 2.8 2.4 5.3 -0.2 2.8 4.9 1.8 3.5 5.1 6.2 HKO (Hong Kong) -12.5 -9.9 -5.7 -5.2 -5.5 -3.9 4.6 2.5 5.1 5.7 IFAG (Wettzell) -166.6 -161.3 -160.4 -152.4 -150.9 -144.6 -145.2 0.7 5.1 5.2 IGNA (Buenos Aires) - - - - - - - - - - (3) INPL (Jerusalem) - - - - - - - - - - INTI (Buenos Aires) -13.4 -30.6 -20.2 -9.3 -13.3 -10.9 -10.6 4.0 20.0 20.4 IT (Torino) 4.0 6.4 5.1 4.7 1.9 0.8 -2.2 0.5 1.7 1.8 JATC (Lintong) 4.3 6.3 5.1 3.1 -0.5 0.3 5.9 0.5 4.9 5.0 JV (Kjeller) 2128.3 2580.5 2869.2 3115.0 3289.3 3678.0 3941.5 5.0 20.0 20.7 KIM (Serpong-Tangerang) -247.9 -243.4 -221.9 -206.4 -207.3 -200.2 -187.0 3.0 20.0 20.3 KRIS (Daejeon) -8.6 -13.9 -8.1 -6.5 -7.2 -14.2 -17.4 0.4 7.0 7.0 KZ (Astana) -1287.3 -1326.1 -1367.0 -1399.0 -1445.6 -1487.7 -1527.7 2.0 20.0 20.1 LT (Vilnius) 760.0 768.3 774.1 773.5 764.6 785.8 804.7 2.0 5.1 5.5 LV (Riga) 3546.7 3558.2 3567.8 3587.8 3601.8 3619.3 3633.4 1.5 7.1 7.2 MIKE (Espoo) 173.0 172.3 166.6 173.0 168.7 164.9 162.4 5.0 20.0 20.6 MKEH (Budapest) -24777.5 -24991.4 -25202.6 -25420.0 -25637.6 -25846.0 -26058.2 2.5 20.0 20.2 Date 2009 0h UTC AUG 31 SEP 5 SEP 10 SEP 15 SEP 20 SEP 25 SEP 30 Uncertainty/ns Notes MJD 55074 55079 55084 55089 55094 55099 55104 uA uB u Laboratory k [UTC-UTC(k)]/ns MSL (Lower Hutt) 30.4 10.5 -3.2 -13.8 -39.2 -42.4 -46.5 1.0 20.0 20.1 NAO (Mizusawa) 53.3 61.0 61.6 64.9 73.3 72.3 77.5 3.0 19.7 19.9 NICT (Tokyo) 5.3 4.7 9.3 10.0 12.8 8.6 8.2 0.5 4.7 4.7 NIM (Beijing) -23.4 -22.0 -20.7 -12.0 -15.7 -17.8 -17.2 1.0 20.0 20.1 NIMB (Bucharest) -319.7 -324.9 -314.2 -319.7 -317.3 -323.2 -311.9 2.0 20.0 20.1 NIMT (Bangkok) -474.9 -479.5 -496.0 -517.2 -531.4 -543.3 -564.3 1.0 20.0 20.1 NIS (Cairo) 38.1 21.7 14.2 10.9 14.6 16.6 15.2 1.5 7.1 7.2 NIST (Boulder) -16.7 -15.1 -14.3 -13.8 -12.7 -10.2 -8.3 0.5 5.0 5.0 NMIJ (Tsukuba) 12.8 18.2 17.6 17.2 15.9 16.1 15.7 0.4 7.0 7.0 NMLS (Sepang) -135.2 -160.6 -180.5 -200.4 -216.1 -234.0 -259.5 2.0 20.0 20.1 NPL (Teddington) 30.7 31.9 32.0 32.5 32.6 34.0 35.0 1.0 5.1 5.2 NPLI (New-Delhi) 2.2 6.1 6.3 7.4 7.8 10.8 5.4 2.5 7.1 7.5 NRC (Ottawa) -70.3 -68.7 -68.9 -71.1 -66.9 -70.1 -68.6 0.7 5.1 5.2 NRL (Washington DC) 3.8 5.3 4.0 4.3 3.2 4.4 5.2 0.4 7.0 7.0 NTSC (Lintong) 13.2 6.0 -2.6 4.9 9.0 11.8 9.8 0.5 4.8 4.9 ONBA (Buenos Aires) -2313.3 -2330.1 -2346.2 -2358.4 -2384.4 -2392.5 -2402.5 2.5 5.1 5.7 ONRJ (Rio de Janeiro) -1.2 -5.3 -11.8 -4.1 -15.6 -9.4 -9.9 3.9 19.7 20.1 OP (Paris) 12.3 -0.9 -5.3 -16.7 -17.8 -22.2 -18.5 0.5 1.6 1.7 ORB (Bruxelles) 19.2 22.8 27.7 28.4 27.8 28.6 29.3 0.4 7.0 7.0 PL (Warszawa) -35.4 -39.6 -35.0 -33.6 -35.6 -38.9 -31.7 1.5 5.0 5.2 PTB (Braunschweig) -30.1 -28.4 -24.3 -20.5 -15.5 -12.8 -12.5 0.2 1.2 1.2 ROA (San Fernando) 8.9 12.1 15.3 18.2 18.2 17.3 17.3 0.7 5.0 5.1 SCL (Hong Kong) 4.1 12.7 16.6 20.2 15.1 14.2 10.5 3.0 10.0 10.4 SG (Singapore) 8.8 13.9 23.1 22.3 22.4 19.6 17.7 0.7 5.1 5.2 (4) SIQ (Ljubljana) -596.9 -604.2 -586.7 -585.0 -576.8 -551.4 -541.2 5.0 20.0 20.6 SMD (Bruxelles) 30.8 27.3 25.1 22.0 21.2 29.6 33.2 1.5 19.7 19.7 SMU (Bratislava) 11.3 11.0 - 19.2 25.2 30.8 27.1 1.5 20.0 20.1 SP (Boras) -18.8 -19.8 -23.4 -22.4 -15.3 -2.5 1.1 0.5 1.6 1.6 SU (Moskva) 0.2 2.5 4.0 3.8 6.9 7.9 8.4 1.5 5.1 5.3 TCC (Concepcion) 111.2 126.4 136.7 144.4 155.6 152.5 157.4 0.7 19.8 19.8 TL (Chung-Li) -1.9 0.5 0.1 0.2 0.9 1.8 1.0 0.7 4.8 4.9 TP (Praha) 23.5 19.9 13.8 12.9 15.7 14.6 9.4 1.0 5.1 5.2 UA (Kharkov) -28.3 -37.3 -41.9 -54.5 -64.3 -75.1 -90.6 2.5 6.1 6.6 UME (Gebze-Kocaeli) 173.7 172.8 176.5 175.3 181.3 182.5 177.4 1.5 7.1 7.3 USNO (Washington DC) 1.4 1.7 0.8 1.8 2.5 3.1 3.4 0.4 1.8 1.9 VMI (Ha Noi) 9.0 16.9 16.3 24.8 19.1 22.1 26.7 1.0 20.0 20.1 VSL (Delft) 14.3 4.0 8.0 0.5 5.3 1.5 -20.8 0.7 1.6 1.7 ZA (Pretoria) - - - - - - - - - - - Notes on section 1: (1) CH : Change of master clock on MJD 55078. (2) DMDM : Directorate of Measures and Precious Metals, formerly ZMDM. (3) IGNA : Instituto Geográfico Nacional, formerly IGMA. (4) SG : Change of master clock on MJD 55088.29 2 - International Atomic Time TAI and Local atomic time scales TA(k). Computed values of [TAI-TA(k)]. Date 2009 0h UTC AUG 31 SEP 5 SEP 10 SEP 15 SEP 20 SEP 25 SEP 30 MJD 55074 55079 55084 55089 55094 55099 55104 Laboratory k [TAI-TA(k)]/ns CH (Bern) 48836.1 48790.1 48744.6 48699.9 48652.0 48605.9 48562.8 F (Paris) 168043.9 168038.2 168037.3 168033.5 168032.5 168032.1 168030.7 IT (Torino) 85353.3 85497.5 85639.9 85787.0 85928.0 86075.8 86217.5 JATC (Lintong) -46676.1 -46700.5 -46725.9 -46749.7 -46774.5 -46798.8 -46822.4 KRIS (Daejeon) 29158.8 29208.2 29268.0 29324.2 29378.1 29426.2 29477.7 NICT (Tokyo) 101.9 102.1 105.1 104.6 104.9 102.2 102.3 NIST (Boulder) -45338708.1 -45338900.0 -45339092.7 -45339285.7 -45339479.6 -45339672.1 -45339865.2 NRC (Ottawa) 30283.9 30251.5 30217.2 30181.1 30151.0 30113.9 30081.6 NTSC (Lintong) 9043.8 9070.2 9095.2 9122.9 9148.5 9175.2 9201.0 ONRJ (Rio de Janeiro) -5471.9 -5507.5 -5543.7 -5576.6 -5611.9 -5643.9 -5677.0 PL (Warszawa) -5749.4 -5768.2 -5787.6 -5807.9 -5826.7 -5849.8 -5866.1 PTB (Braunschweig) -356703.2 -356696.6 -356687.5 -356678.7 -356668.7 -356660.9 -356655.5 SG (Singapore) - 6753.7 6751.0 6746.1 6746.5 6743.4 6741.7 SU (Moskva) 27256243.5 27256365.9 27256487.5 27256608.2 27256732.3 27256855.1 27256977.4 (1) TL (Chung-Li) -158.0 -171.1 -183.2 -192.5 -200.6 -210.3 -219.4 USNO (Washington DC) -35049274.4 -35049571.6 -35049871.3 -35050170.1 -35050468.5 -35050767.6 -35051067.4 - 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) Steering correction 55074 - 55104 6.691x10**-13 (2009 AUG 31 - 2009 SEP 30) New correction 55104 - 55134 6.686x10**-13 (2009 SEP 30 - 2009 OCT 30) New correction foreseen 55134 - 55164 6.681x10**-13 (2009 OCT 30 - 2009 NOV 29) 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 2.0x10**-15 / sqrt(t), (2) a flicker frequency noise of 0.4x10**-15 and (3) a random walk frequency noise of 1.0x10**-16 x sqrt(t). The relation between EAL and TAI is given in Circular T and the BIPM Annual Report on Time Activities. 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, 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. Ref(uB) is a reference giving information on the values of uB or is the Circular T where the reference was first given. uB(Ref) is the uB value stated in this references. Note that all uncertainties may vary over time and that the current uB values are generally not the same as the peer reviewed values given in Ref(uB). See “http://www.bipm.org/jsp/en/TimeFtp.jsp” for previous issues of Circular T and individual Reports of Evaluation of Primary Frequency Standards that explain changes in uncertainties. All values are expressed in 10**-15 and are valid only for the stated period of estimation. Standard Period of d uA uB ul/Lab ul/Tai u Ref(uB) uB(Ref) Note Estimation PTB-CS1 55074 55104 -5.26 5.00 8.00 0.00 0.13 9.43 T148 8. (1) PTB-CS2 55074 55104 -1.40 3.00 12.00 0.00 0.13 12.37 T148 12. (1) SYRTE-JPO 55074 55104 3.54 0.56 6.30 0.30 0.40 6.34 T160 6.30 (2) SYRTE-FO1 55074 55104 4.88 0.20 0.47 0.11 0.40 0.66 T227 0.72 (2) SYRTE-FO2 55074 55104 6.05 0.20 0.45 0.11 0.40 0.64 T227 0.65 (2) SYRTE-FOM 55074 55104 5.07 0.20 0.71 0.35 0.40 0.91 T184 0.80 (2) Notes: (1) Continuously operating as a clock participating to TAI (2) Report 02 OCT. 2009 by LNE-SYRTE The second table gives the BIPM estimate of d, based on all available PFS measurements over the period MJD 54714-55104, 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 55074-55104 5.3x10**-15 0.4x10**-15 (2009 AUG 31 - 2009 SEP 30) 5 - Relations of UTC and TAI with GPS time and GLONASS time. [UTC-GPS time] = -15 s + C0, [TAI-GPS time] = 19 s + C0, global uncertainty is of order 10 ns. [UTC-GLONASS time] = 0 s + C1, [TAI-GLONASS time] = 34 s + C1, global uncertainty is of order hundreds ns. The C0 values provide a realization of GPS time, as obtained using the values [UTC-UTC(OP)] and the GPS data taken at the Paris Observatory, corrected for IGS precise orbits, clocks and ionosphere maps. The C1 values provide a realization of GLONASS time, as obtained using the values [UTC-UTC(AOS)] and the GLONASS data taken at the Astrogeodynamical Observatory Borowiec (AOS). N0 and N1 are the numbers of measurements, when N0 or N1 is 0, the corresponding values of C0 or C1 are interpolated. The standard deviations S0 and S1 characterize the dispersion of individual measurements. The actual uncertainty of user's access to GPS and GLONASS times may differ from these values. For this circular, S0 = 2.6 ns, S1 = 14.3 ns Date 2009 0h UTC MJD C0/ns N0 C1/ns N1 AUG 31 55074 -1.3 45 85.3 75 SEP 1 55075 -4.8 43 82.8 77 SEP 2 55076 -2.2 43 84.0 80 SEP 3 55077 -2.1 44 83.9 82 SEP 4 55078 -4.9 45 81.1 75 SEP 5 55079 -4.4 41 80.0 76 SEP 6 55080 -3.8 44 80.0 71 SEP 7 55081 -2.6 42 78.8 69 SEP 8 55082 -2.6 42 79.6 64 SEP 9 55083 -3.5 45 75.7 73 SEP 10 55084 -5.0 42 73.3 81 SEP 11 55085 -6.1 44 78.0 85 SEP 12 55086 -4.6 43 75.1 78 SEP 13 55087 -4.8 44 63.9 69 SEP 14 55088 -4.3 44 58.7 70 SEP 15 55089 -0.3 43 66.8 65 SEP 16 55090 -1.5 43 66.9 63 SEP 17 55091 -2.4 43 57.2 71 SEP 18 55092 -0.4 42 51.2 66 SEP 19 55093 -2.3 37 49.3 66 SEP 20 55094 -3.6 41 51.4 74 SEP 21 55095 -4.0 43 52.4 77 SEP 22 55096 -2.3 40 52.8 72 SEP 23 55097 -1.5 45 55.3 80 SEP 24 55098 -0.7 44 55.2 82 SEP 25 55099 -3.3 38 53.7 78 SEP 26 55100 -3.0 39 52.8 74 SEP 27 55101 -2.8 40 53.5 63 SEP 28 55102 -6.8 40 53.1 70 SEP 29 55103 -5.1 36 53.6 79 SEP 30 55104 -4.5 40 55.4 75 6 - Time links used for the computation of TAI and their uncertainties. The time links used in the elaboration of this Circular T are listed in this section. The technique for the link is indicated as follows: GPS SC for GPS all-in-view single-channel C/A data; GPS MC for GPS all-in-view multi-channel C/A data; GPS P3 for GPS all-in-view multi-channel dual-frequency P code data; GPS PPP for GPS Precise Point Positioning technique; GPS GT for 'GPS time' observations; INT LK for internal cable link and TWSTFT for two-way satellite time and frequency transfer data. For each link, the following uncertainties are provided: uA is the statistical uncertainty evaluated by taking into account the level of phase noise in the raw data, the interpolation interval between data points and the effects with typical duration between 5 and 30 days. uB is the estimated uncertainty on the calibration. The calibration type of the link is indicated as: GPS EC for GPS equipment calibration; TW EC for two-way equipment calibration; LC (technique) for a link calibrated using 'technique'; BC (technique) for a link calibrated using 'technique' to transfer a past equipment calibration through a discontinuity of link operation. DIC is used for direct internal calibration. The calibration dates indicate: the most recent calibration results for the two laboratories in the case of EC and the most recent calibration of the link in the case of LC and BC, NA stands for not available, in this case estimated values are provided Link Type uA/ns uB/ns Calibration Type Calibration Dates AOS /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2007 Jan/2006 Sep APL /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2003 Dec/2006 Sep AUS /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2004 Nov/2006 Sep BEV /PTB GPS MC 1.5 3.0 BC(TWSTFT) 2008 Jan BIM /PTB GPS MC 2.0 7.0 GPS EC/GPS EC 2007 Nov BIRM/PTB GPS MC 2.0 20.0 NA /GPS EC NA /2006 Sep BY /PTB GPS MC 2.0 7.0 GPS EC/GPS EC 2008 Jun/2006 Sep CAO /PTB GPS MC 1.5 7.0 GPS EC/GPS EC 2004 Nov/2006 Sep CH /PTB TWSTFT 0.5 1.0 BC (GPS PPP) 2008 Sep CNM /PTB GPS MC 2.5 5.0 BC(GPS SC) 2008 May CNMP/PTB GPS MC 3.0 5.0 GPS EC/GPS EC 2004 May/2006 Sep DLR /PTB GPSPPP 0.3 5.0 GPS EC/GPS EC 2007 Feb/2004 Aug DMDM/PTB GPS MC 2.0 7.0 GPS EC/GPS EC 2007 Jan/2006 Sep DTAG/PTB GPS P3 1.5 10.0 BC(GPS MC) 2009 Jul EIM /PTB GPS MC 3.5 5.0 GPS EC/GPS EC 2007 May/2003 Aug HKO /PTB GPS MC 2.5 5.0 GPS EC/GPS EC 2004 Sep/2006 Sep IFAG/PTB GPS P3 0.7 5.0 GPS EC/GPS EC 2003 Jun/2004 Aug IGNA/PTB NA INPL/PTB NA INTI/PTB GPS MC 4.0 20.0 NA /GPS EC NA /2006 Sep Link Type uA/ns uB/ns Calibration Type Calibration Dates IT /PTB TWSTFT 0.5 1.2 BC(GPS PPP) 2008 Sep JATC/NTSC INT LK 0.2 1.0 DIC /2006 Sep JV /PTB GPS GT 5.0 20.0 NA /GPS EC NA /2003 Aug KIM /PTB GPS MC 3.0 20.0 NA /GPS EC NA /2006 Sep KRIS/PTB GPSPPP 0.3 5.0 GPS EC/GPS EC 2005 Aug/2004 Aug KZ /PTB GPS MC 2.0 20.0 NA /GPS EC NA /2006 Sep LT /PTB GPS MC 2.0 5.0 GPS EC/GPS EC 2006 Oct/2006 Sep LV /PTB GPS MC 1.5 7.0 GPS EC/GPS EC 2006 Feb/2006 Sep MIKE/PTB GPS MC 5.0 20.0 NA /GPS EC NA /2006 Sep MKEH/PTB GPS SC 2.5 20.0 NA /GPS EC NA /2006 Sep MSL /PTB GPS P3 1.0 20.0 NA /GPS EC NA /2004 Aug NAO /PTB GPS MC 3.0 20.0 NA /GPS EC NA /2006 Sep NICT/PTB TWSTFT 0.5 5.0 LC(GPS P3) 2009 Jun NIM /PTB GPS P3 1.0 20.0 NA /GPS EC NA /2004 Aug NIMB/PTB GPS MC 2.0 20.0 NA /GPS EC NA /2006 Sep NIMT/PTB GPS P3 1.0 20.0 NA /GPS EC NA /2004 Aug NIS /PTB GPS MC 1.5 7.0 GPS EC/GPS EC 2005 May/2006 Sep NIST/PTB TWSTFT 0.5 5.0 BC(GPS PPP) 2005 May NMIJ/PTB GPSPPP 0.3 5.0 GPS EC/GPS EC 2002 Apr/2004 Aug NMLS/PTB GPS MC 2.0 20.0 NA /GPS EC NA /2006 Sep NPL /PTB GPS P3 1.0 5.0 NA/GPS EC NA /2004 Aug NPLI/PTB GPS MC 2.5 7.0 GPS EC/GPS EC 2005 Jul/2006 Sep NRC /PTB GPS P3 0.7 5.0 GPS EC/GPS EC 2003 Nov/2004 Aug NRL /PTB GPSPPP 0.3 5.0 GPS EC/GPS EC 2002 May/2004 Aug NTSC/PTB TWSTFT 0.5 5.0 BC(GPS MC) 2009 May ONBA/PTB GPS MC 2.5 5.0 GPS EC/GPS EC 2004 Jul/2006 Sep ONRJ/PTB GPS MC 4.0 20.0 NA /GPS EC NA /2006 Sep OP /PTB TWSTFT 0.5 1.1 LC(TWSTFT) 2008 Sep ORB /PTB GPSPPP 0.3 5.0 GPS EC/GPS EC 2003 Jul/2004 Aug PL /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2006 Oct/2006 Sep ROA /PTB TWSTFT 0.7 5.0 BC(GPS PPP) 2005 May SCL /PTB GPS MC 3.0 10.0 LC(GPS SC) 1993 May SG /PTB GPS P3 0.7 5.0 LC(GPS MC) 2009 Jun SIQ /PTB GPS SC 5.0 20.0 NA /GPS EC NA /2003 Aug SMD /PTB GPS MC 1.5 20.0 NA /GPS EC NA /2006 Sep SMU /PTB GPS MC 1.5 20.0 NA /GPS EC NA /2006 Sep SP /PTB TWSTFT 0.5 1.0 BC(GPS PPP) 2006 Mar SU /PTB GPS MC 1.5 5.0 GPS EC/GPS EC 2008 Sep/2006 Sep TCC /PTB GPS P3 0.7 20.0 NA /GPS EC NA /2004 Aug TL /PTB GPS P3 0.7 5.0 GPS EC/GPS EC 2005 May/2004 Aug TP /PTB GPS P3 1.0 5.0 LC(GPS SC) 2006 Sep UA /PTB GPS MC 2.5 6.0 GPS EC/GPS EC 2006 Jun/2006 Sep UME /PTB GPS MC 1.5 7.0 GPS EC/GPS EC 2005 Dec/2006 Sep USNO/PTB TWSTFT 0.5 2.0 BC(TW X-Band) 2005 May VMI /PTB GPS P3 1.0 20.0 NA /GPS EC NA /2004 Aug VSL /PTB TWSTFT 0.7 1.0 BC(GPS PPP) 2006 Mar ZA /PTB NA