24 April 2008 FA/GPSW.401 Dear Colleagues, Please find enclosed tracking schedule No. 50 for international time and frequency comparisons by GPS common-view single-channel receivers. Computation of this schedule is fully automated. It follows that all areas have an equal number of tracks (48). The enclosed schedule should be implemented on MJD 54586 (30 April 2008) 00h00 UTC. The GPS tracking schedules continue to be sent to regular users by e-mail and are also available by anonymous FTP (ftp2.bipm.org, node 62.161.69.5, subdirectory pub\tai\publication) and on the BIPM website (http://www.bipm.org). The track times given in this schedule are the start times for the 13 minute standard tracks. Because a period of about 2 minutes is usually required to lock the receiver onto the satellite signal, this delay must be subtracted from the given track time. It follows that if you operate an ‘NBS-type’ receiver, for instance TTR 5, TTR 5A, TTR 6 or TTR 6A from AOA, you must modify the given track time: for example, the European schedule of PRN 08 at 00h06 should be entered in the AOA receivers at 00h04. For TTR 6 users a utility software (TTR6SCHLOAD) to upload correctly the schedule in the receiver can be found in the FTP server (ftp2.bipm.org, node 62.161.69.5, subdirectory pub\tai\data). This tracking schedule conforms with the technical directives for standardization drawn up by the CCTF Group on Global navigation satellite systems Time Transfer Standards (CGGTTS). Please feel free to contact us if there are questions, suggestions or comments regarding the enclosed documents. Yours sincerely, E. Felicitas Arias Head, Time frequency and gravimetry section Note for multi-channel receivers Multi-channel receivers do not need to implement the new schedules if they refer track times to MJD 50722 (1 October 1997), the reference date of GPS schedule No. 29. As schedules for single-channel receivers always refer to this date, compatibility between multi- channel and single-channel observations is maintained. In the future, when all single-channel receivers are withdrawn from operation, the use of a fixed reference date for multi-channel receivers will allow us to cease publication of this common-view schedule. ***************************************************************************** * GPS Schedule no 50 * * for implementation on MJD 54586 (30 April 2008) at 0h UTC * * Reference date MJD 50722 (1997 October 1) * ***************************************************************************** This is a suggested tracking schedule for international time comparisons using GPS satellites in common-view between ten areas of the globe. Area Participating laboratories Europe E AOS, BEV, BIM, BY, CAO, CH, DLR, DTAG, EIM, IFAG, IPQ*, IT, JV, LDS, LT, LV, Mad*, MIKE, MKEH, NIMB, NPL, OB*, OCA*, OP, ORB, PL, PTB, RAAI*, RIRT*, ROA, SIQ, SMU, SP, SU, TP, UME, VSL, ZMDM East North America ENA AO*, APL, NRC, NRL*, USNO West North America WNA AMC*, CNM, CNMP, Gold*, NIST, WWV* Hawaii H WWVH* East Asia EA BIRM, HKO, JATC, KIM*, KRIS, NAO, NICT, NIM, NIMT, NMIJ, NMLS, NTSC, SCL, SG, TL, VMI* Australia and New Zealand A AUS, Can*, MSL India I NPLI Middle East ME INPL, NIS South Africa SAF ZA South America SAM IGMA, Kou*, ONBA, ONRJ, TCC Laboratories participating in TAI are designated by their usual acronyms (see Table 3 of the BIPM Annual Report on time activities, Volume 1, 2006); other laboratories are indicated by an asterisk. * AMC : USNO Alternate Master Clock, Colorado. AO : Arecibo Observatory. IPQ : Instituto Português da Qualidade, Monte de Caparica, Portugal. KIM : Research Centre for Calibration, Instrumentation and Metrology - The Indonesian Institute of Sciences, Serpong-Tangerang - Indonesia. Kou : CNES Kourou Center. Mad, Gold, Can : JPL Deep Space Network, Madrid, Goldstone, Canberra. NRL : U.S. Naval Research Laboratory - Washington, DC. OCA : Observatoire de la Cote d'Azur, Grasse, France. OB : Observatoire de Besançon, Besançon, France. RIRT : Russian Institute of Radionavigation and Time, Saint Petersburg. RAAI : Romanian Academy Astronomical Institute, Bucarest. VMI : Vietnam Metrology Institute, Ha Noi - Vietnam. WWV, WWVH : NIST stations in Colorado and Hawaii. The start times of the tracks are referenced to UTC. The start time of a track is the date of the first observation. It may be necessary to advance this time by 2 minutes if you operate an NBS-type receiver, in order to allow the lock-on procedure onto the satellite signal. The track length is 780 s. All the track times should be decremented by 4 minutes each day, to account for the GPS sidereal orbits. The class bytes are such that in association with the satellite number they form a unique identifyer for each common view. GPS Schedule no 50 (30 April 2008) *** Europe *** Class PRN Start Connects h m BC 24 0 10 SAF,ME,I BC 30 0 42 SAF,ME,I BD 30 1 14 SAF,ME,I A0 29 1 30 ME,I,EA 74 16 1 46 WNA,ME,ENA 75 16 2 2 WNA,ME,ENA A0 24 2 34 ME,I,EA 18 03 3 6 WNA,ENA,SAM 19 03 3 22 WNA,ENA,SAM A0 21 3 54 ME,I,EA A1 21 4 10 ME,I,EA A0 18 4 26 ME,I,EA 74 19 4 42 WNA,ME,ENA 75 19 4 58 WNA,ME,ENA BC 32 5 14 SAF,ME,SAM A0 22 6 14 ME,I,EA A1 22 6 30 ME,I,EA 74 11 7 18 WNA,ME,ENA 75 11 7 34 WNA,ME,ENA A0 14 7 50 ME,I,EA A1 14 8 6 ME,I,EA A0 32 8 38 ME,I,EA A1 32 9 10 ME,I,EA BC 23 9 42 SAF,ME,SAM BC 13 10 14 SAF,ME,SAM BD 13 10 30 SAF,ME,SAM D4 13 10 46 SAF,ME,SAM 74 04 11 34 WNA,ME,ENA 75 04 11 50 WNA,ME,ENA A0 23 12 38 ME,I,EA BC 08 12 54 SAF,ME,SAM 18 02 13 10 WNA,ENA,SAM BD 08 13 42 SAF,ME,SAM A0 25 14 14 ME,I,EA 74 10 14 30 WNA,ME,ENA 75 10 14 46 WNA,ME,ENA A0 27 15 34 ME,I,EA 74 26 16 22 WNA,ME,ENA 74 15 16 54 WNA,ME,ENA BC 10 17 26 SAF,ME,SAM A0 28 18 14 ME,I,EA 74 09 18 46 WNA,ME,ENA,SAM 75 09 19 2 WNA,ME,ENA 18 18 19 18 WNA,ENA,SAM BC 29 21 42 SAF,ME,SAM BD 29 22 14 SAF,ME,SAM D4 29 22 30 SAF,ME,SAM 74 31 23 50 WNA,ME,ENA GPS Schedule no 50 (30 April 2008) *** E. North America *** *** W. North America *** *** East Asia *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 34 13 0 58 WNA,H,EA 34 13 0 58 H,EA,ENA 34 13 0 58 WNA,H,ENA 74 16 1 46 WNA,ME,E 74 16 1 46 ME,ENA,E 3C 04 1 14 A,H 75 16 2 2 WNA,ME,E 75 16 2 2 ME,ENA,E A0 29 1 30 ME,I,E 34 27 2 18 WNA,H,EA 34 27 2 18 H,EA,ENA 3D 04 1 46 A,H 18 23 2 34 WNA,SAM 18 23 2 34 ENA,SAM D4 04 2 2 A,H 18 03 3 6 WNA,E,SAM 18 03 3 6 ENA,E,SAM 34 27 2 18 WNA,H,ENA 19 03 3 22 WNA,E,SAM 19 03 3 22 ENA,E,SAM A0 24 2 34 ME,I,E 34 08 3 38 WNA,H,EA 34 08 3 38 H,EA,ENA 3C 02 3 6 A,H 35 13 3 54 WNA,H,SAM 35 13 3 54 H,ENA,SAM 34 08 3 38 WNA,H,ENA D4 13 4 10 WNA,H,SAM D4 13 4 10 H,ENA,SAM A0 21 3 54 ME,I,E 74 19 4 42 WNA,ME,E 74 19 4 42 ME,ENA,E A1 21 4 10 ME,I,E 75 19 4 58 WNA,ME,E 75 19 4 58 ME,ENA,E A0 18 4 26 ME,I,E 18 27 5 58 WNA,SAM 18 27 5 58 ENA,SAM AC 09 4 42 I,A 74 11 7 18 WNA,ME,E 74 11 7 18 ME,ENA,E AC 24 4 58 I,A 75 11 7 34 WNA,ME,E 75 11 7 34 ME,ENA,E AD 09 5 14 I,A 34 04 8 6 WNA,H,SAM 34 04 8 6 H,ENA,SAM A0 22 6 14 ME,I,E 35 04 8 22 WNA,H,SAM 35 04 8 22 H,ENA,SAM A1 22 6 30 ME,I,E D4 04 8 38 WNA,H,SAM D4 04 8 38 H,ENA,SAM 3C 12 6 46 A,H 34 12 9 58 WNA,H,EA 34 12 9 58 H,EA,ENA 3D 12 7 18 A,H 34 05 10 30 WNA,H,EA 34 05 10 30 H,EA,ENA 3C 05 7 34 A,H 35 05 10 46 WNA,H,EA 35 05 10 46 H,EA,ENA A0 14 7 50 ME,I,E 34 30 11 18 WNA,H,EA 34 30 11 18 H,EA,ENA A1 14 8 6 ME,I,E 74 04 11 34 WNA,ME,E 74 04 11 34 ME,ENA,E BC 31 8 22 SAF,ME,I 75 04 11 50 WNA,ME,E 75 04 11 50 ME,ENA,E A0 32 8 38 ME,I,E 34 29 12 22 WNA,H,EA 34 29 12 22 H,EA,ENA A1 32 9 10 ME,I,E 18 02 13 10 WNA,E,SAM 18 02 13 10 ENA,E,SAM AC 22 9 26 I,A 74 10 14 30 WNA,ME,E 74 10 14 30 ME,ENA,E 3C 29 9 42 A,H 75 10 14 46 WNA,ME,E 75 10 14 46 ME,ENA,E 34 12 9 58 WNA,H,ENA 35 29 15 18 WNA,H,SAM 35 29 15 18 H,ENA,SAM 3D 29 10 14 A,H D4 29 15 34 WNA,H,SAM D4 29 15 34 H,ENA,SAM 34 05 10 30 WNA,H,ENA 34 06 15 50 WNA,H,EA 34 06 15 50 H,EA,ENA 35 05 10 46 WNA,H,ENA 34 18 16 6 WNA,H 34 18 16 6 H,ENA 34 30 11 18 WNA,H,ENA 74 26 16 22 WNA,ME,E 74 26 16 22 ME,ENA,E 34 29 12 22 WNA,H,ENA 74 15 16 54 WNA,ME,E 74 15 16 54 ME,ENA,E A0 23 12 38 ME,I,E 34 22 17 58 WNA,H 34 22 17 58 H,ENA AC 03 13 10 I,A 18 21 18 14 WNA,SAM 18 21 18 14 ENA,SAM 3C 31 13 26 A,H 74 09 18 46 WNA,ME,E,SAM 74 09 18 46 ME,ENA,E,SAM A0 25 14 14 ME,I,E 75 09 19 2 WNA,ME,E 75 09 19 2 ME,ENA,E A0 27 15 34 ME,I,E 18 18 19 18 WNA,E,SAM 18 18 19 18 ENA,E,SAM 34 06 15 50 WNA,H,ENA 34 32 19 34 WNA,H,EA 34 32 19 34 H,EA,ENA AC 11 16 54 I,A 35 32 19 50 WNA,H,EA 35 32 19 50 H,EA,ENA AD 11 17 10 I,A 34 31 20 6 WNA,H,SAM 34 31 20 6 H,ENA,SAM A0 28 18 14 ME,I,E 35 31 20 22 WNA,H,SAM 35 31 20 22 H,ENA,SAM 34 32 19 34 WNA,H,ENA 34 20 22 14 WNA,H,EA 34 20 22 14 H,EA,ENA 35 32 19 50 WNA,H,ENA 18 32 23 2 WNA,SAM 18 32 23 2 ENA,SAM BC 04 20 6 SAF,ME,I 34 23 23 18 WNA,H,EA 34 23 23 18 H,EA,ENA 34 20 22 14 WNA,H,ENA 35 23 23 34 WNA,H,EA 35 23 23 34 H,EA,ENA 34 23 23 18 WNA,H,ENA 74 31 23 50 WNA,ME,E 74 31 23 50 ME,ENA,E 35 23 23 34 WNA,H,ENA GPS Schedule no 50 (30 April 2008) *** Hawaii *** *** Australia *** *** India *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 3C 08 0 10 A 3C 08 0 10 H BC 24 0 10 SAF,ME,E 3D 08 0 26 A 3D 08 0 26 H F1 05 0 26 I 34 13 0 58 WNA,EA,ENA 3C 04 1 14 H,EA BC 30 0 42 SAF,ME,E 3C 04 1 14 A,EA CC 09 1 30 SAF A4 12 0 58 SAF 3D 04 1 46 A,EA 3D 04 1 46 H,EA BD 30 1 14 SAF,ME,E D4 04 2 2 A,EA D4 04 2 2 H,EA A0 29 1 30 ME,EA,E 34 27 2 18 WNA,EA,ENA 3C 02 3 6 H,EA A4 30 1 46 SAF 3C 02 3 6 A,EA CC 12 3 22 SAF A5 30 2 2 SAF 34 08 3 38 WNA,EA,ENA CC 05 3 38 SAF BC 18 2 18 SAF,ME 35 13 3 54 WNA,ENA,SAM CD 05 3 54 SAF A0 24 2 34 ME,EA,E D4 13 4 10 WNA,ENA,SAM D4 05 4 10 SAF BD 18 2 50 SAF,ME 3C 10 5 58 A CC 30 4 26 SAF A4 18 3 6 SAF 3C 12 6 46 A,EA AC 09 4 42 I,EA F1 15 3 22 I 38 09 7 2 I AC 24 4 58 I,EA F2 15 3 38 I 3D 12 7 18 A,EA AD 09 5 14 I,EA A0 21 3 54 ME,EA,E 3C 05 7 34 A,EA CC 29 5 42 SAF A1 21 4 10 ME,EA,E 34 04 8 6 WNA,ENA,SAM 3C 10 5 58 H A0 18 4 26 ME,EA,E 35 04 8 22 WNA,ENA,SAM 3C 12 6 46 H,EA AC 09 4 42 A,EA D4 04 8 38 WNA,ENA,SAM 3D 12 7 18 H,EA AC 24 4 58 A,EA 3C 29 9 42 A,EA 3C 05 7 34 H,EA AD 09 5 14 A,EA 34 12 9 58 WNA,EA,ENA CC 06 8 38 SAF F1 14 5 42 I 3D 29 10 14 A,EA CC 16 8 54 SAF A4 06 5 58 SAF 34 05 10 30 WNA,EA,ENA CD 06 9 10 SAF A0 22 6 14 ME,EA,E 35 05 10 46 WNA,EA,ENA AC 22 9 26 I,EA A1 22 6 30 ME,EA,E 34 30 11 18 WNA,EA,ENA 3C 29 9 42 H,EA F2 14 6 46 I 38 31 11 50 I A4 16 9 58 SAF,I 38 09 7 2 H 34 29 12 22 WNA,EA,ENA 3D 29 10 14 H,EA FB 14 7 18 I 3C 31 13 26 A,EA CC 03 11 2 SAF FC 14 7 34 I 38 06 13 42 I CC 19 11 18 SAF A0 14 7 50 ME,EA,E 38 16 13 58 I CD 19 11 34 SAF A1 14 8 6 ME,EA,E 3D 31 14 14 A D4 19 12 6 SAF BC 31 8 22 SAF,ME,EA 35 29 15 18 WNA,ENA,SAM A4 32 12 22 SAF,I A0 32 8 38 ME,EA,E D4 29 15 34 WNA,ENA,SAM AC 03 13 10 I,EA A1 32 9 10 ME,EA,E 34 06 15 50 WNA,EA,ENA 3C 31 13 26 H,EA AC 22 9 26 A,EA 34 18 16 6 WNA,ENA CC 11 13 58 SAF A4 16 9 58 SAF,A 3C 32 16 38 A 3D 31 14 14 H 38 31 11 50 H 3C 16 17 42 A CD 11 14 30 SAF A4 32 12 22 SAF,A 34 22 17 58 WNA,ENA CC 20 15 2 SAF A0 23 12 38 ME,EA,E 38 11 19 18 I CD 20 15 34 SAF AC 03 13 10 A,EA 34 32 19 34 WNA,EA,ENA 3C 32 16 38 H 38 06 13 42 H 35 32 19 50 WNA,EA,ENA AC 11 16 54 I,EA 38 16 13 58 H 34 31 20 6 WNA,ENA,SAM AD 11 17 10 I,EA A0 25 14 14 ME,EA,E 35 31 20 22 WNA,ENA,SAM 3C 16 17 42 H A0 27 15 34 ME,EA,E 3C 23 20 54 A CC 13 18 14 SAF AC 11 16 54 A,EA 3C 13 21 58 A 3C 23 20 54 H AD 11 17 10 A,EA 34 20 22 14 WNA,EA,ENA 3C 13 21 58 H A0 28 18 14 ME,EA,E 34 23 23 18 WNA,EA,ENA CC 26 23 2 SAF 38 11 19 18 H 35 23 23 34 WNA,EA,ENA CC 15 23 34 SAF BC 04 20 6 SAF,ME,EA GPS Schedule no 50 (30 April 2008) *** Middle East *** *** South Africa *** *** South America *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m BC 24 0 10 SAF,I,E BC 24 0 10 ME,I,E F8 03 0 10 SAM BC 30 0 42 SAF,I,E BC 30 0 42 ME,I,E FB 03 0 26 SAM BD 30 1 14 SAF,I,E A4 12 0 58 I FC 03 0 42 SAM A0 29 1 30 I,EA,E BD 30 1 14 ME,I,E FD 03 0 58 SAM 74 16 1 46 WNA,ENA,E CC 09 1 30 A FE 03 1 14 SAM 75 16 2 2 WNA,ENA,E A4 30 1 46 I FE 03 1 30 SAM BC 18 2 18 SAF,I A5 30 2 2 I FE 03 1 46 SAM A0 24 2 34 I,EA,E BC 18 2 18 ME,I FE 03 2 2 SAM BD 18 2 50 SAF,I BD 18 2 50 ME,I F8 19 2 18 SAM A0 21 3 54 I,EA,E A4 18 3 6 I 18 23 2 34 WNA,ENA A1 21 4 10 I,EA,E CC 12 3 22 A FB 19 2 50 SAM A0 18 4 26 I,EA,E CC 05 3 38 A 18 03 3 6 WNA,ENA,E 74 19 4 42 WNA,ENA,E CD 05 3 54 A 19 03 3 22 WNA,ENA,E 75 19 4 58 WNA,ENA,E D4 05 4 10 A F8 11 3 38 SAM BC 32 5 14 SAF,E,SAM CC 30 4 26 A 35 13 3 54 WNA,H,ENA A0 22 6 14 I,EA,E BC 32 5 14 ME,E,SAM D4 13 4 10 WNA,H,ENA A1 22 6 30 I,EA,E CC 29 5 42 A FB 11 4 26 SAM 74 11 7 18 WNA,ENA,E A4 06 5 58 I FC 11 4 42 SAM 75 11 7 34 WNA,ENA,E BC 31 8 22 ME,I,EA FD 11 4 58 SAM A0 14 7 50 I,EA,E CC 06 8 38 A BC 32 5 14 SAF,ME,E A1 14 8 6 I,EA,E CC 16 8 54 A F8 07 5 42 SAM BC 31 8 22 SAF,I,EA CD 06 9 10 A 18 27 5 58 WNA,ENA A0 32 8 38 I,EA,E CA 13 9 26 SAM FB 07 6 14 SAM A1 32 9 10 I,EA,E BC 23 9 42 ME,E,SAM FC 07 6 30 SAM BC 23 9 42 SAF,E,SAM A4 16 9 58 I,A 34 04 8 6 WNA,H,ENA BC 13 10 14 SAF,E,SAM BC 13 10 14 ME,E,SAM 35 04 8 22 WNA,H,ENA BD 13 10 30 SAF,E,SAM BD 13 10 30 ME,E,SAM D4 04 8 38 WNA,H,ENA D4 13 10 46 SAF,E,SAM D4 13 10 46 ME,E,SAM CA 13 9 26 SAF 74 04 11 34 WNA,ENA,E CC 03 11 2 A BC 23 9 42 SAF,ME,E 75 04 11 50 WNA,ENA,E CC 19 11 18 A BC 13 10 14 SAF,ME,E A0 23 12 38 I,EA,E CD 19 11 34 A BD 13 10 30 SAF,ME,E BC 08 12 54 SAF,E,SAM D4 19 12 6 A D4 13 10 46 SAF,ME,E BD 08 13 42 SAF,E,SAM A4 32 12 22 I,A BC 08 12 54 SAF,ME,E A0 25 14 14 I,EA,E BC 08 12 54 ME,E,SAM 18 02 13 10 WNA,ENA,E 74 10 14 30 WNA,ENA,E BD 08 13 42 ME,E,SAM BD 08 13 42 SAF,ME,E 75 10 14 46 WNA,ENA,E CC 11 13 58 A 35 29 15 18 WNA,H,ENA A0 27 15 34 I,EA,E CD 11 14 30 A D4 29 15 34 WNA,H,ENA 74 26 16 22 WNA,ENA,E CC 20 15 2 A BC 10 17 26 SAF,ME,E 74 15 16 54 WNA,ENA,E CD 20 15 34 A 18 21 18 14 WNA,ENA BC 10 17 26 SAF,E,SAM BC 10 17 26 ME,E,SAM 74 09 18 46 WNA,ME,ENA,E A0 28 18 14 I,EA,E CC 13 18 14 A 18 18 19 18 WNA,ENA,E 74 09 18 46 WNA,ENA,E,SAM BC 04 20 6 ME,I,EA 34 31 20 6 WNA,H,ENA 75 09 19 2 WNA,ENA,E CA 29 20 54 SAM 35 31 20 22 WNA,H,ENA BC 04 20 6 SAF,I,EA BC 29 21 42 ME,E,SAM CA 29 20 54 SAF BC 29 21 42 SAF,E,SAM BD 29 22 14 ME,E,SAM BC 29 21 42 SAF,ME,E BD 29 22 14 SAF,E,SAM D4 29 22 30 ME,E,SAM BD 29 22 14 SAF,ME,E D4 29 22 30 SAF,E,SAM CC 26 23 2 A D4 29 22 30 SAF,ME,E 74 31 23 50 WNA,ENA,E CC 15 23 34 A 18 32 23 2 WNA,ENA