11 September 1997 CT/GPSW.315 Dear Colleagues, Please find enclosed tracking schedule No 29 for international time and frequency comparisons by GPS common views. The schedule should be implemented on MJD=50722 (1 October 1997) 0 h UTC. All scheduled satellites belong to Block II and may be subject to Selective Availability and Anti-Spoofing. The GPS tracking schedules are sent to regular users through mail and e-mail and are also available via our INTERNET anonymous FTP (node 145.238.2.2 subdirectory TAI). Tracking schedule No 29 is the forth issued by the BIPM in conformity with the Technical Directives for standardization drawn up by the CCDS Sub-group on GPS and GLONASS Time Transfer Standards [1]. The time of a track given in this schedule is thus the date of the first observation. A period of about 2 minutes is usually required to lock the receiver on to the satellite signal. The characteristic date of a track given in this schedule, does not correspond to the beginning of the lock-on procedure, and thus has a different meaning from that of earlier schedules. It follows that if you operate an 'NBS-type' receiver, for instance TTR 5, TTR 5A, TTR 6 or TTR 6A from AOA, equipped with old or new EPROMS you are invited to modify the given track time by 2 minutes: for example, the track of PRN 25 at 00 h 50 should be entered in the receiver as starting at 00 h 48. We would greatly appreciate if you would inform us of changes in your equipment, modifications of the adopted delays, change of antenna location ...., so that we can maintain the homogeneity of the time comparisons. Please feel free to contact us if there are questions, suggestions or comments regarding the enclosed documents. Yours sincerely, Claudine Thomas Head, Time Section. [1] D. Allan and C. Thomas, Technical Directives for Standardization of GPS Time Receiver Software, Metrologia, 1994, 31, 67-79. 11 September 1997 To European Time Laboratories CT/GPSW.316 Dear Colleagues, As for the previous schedules, we have subdivided the European tracking schedule into four sub-schedules as follows: ( sub-schedule E1 (23 tracks) is optimized for internal European links by choosing equally spaced common views (every 1 h 04), which can be useful for some statistical studies; ( sub-schedule E2 (33 tracks) includes E1 with addition of specific common views between Europe and North America; ( sub-schedule E3 (31 tracks) includes E1 with addition of specific common views between Europe and Middle East or East Asia; ( sub-schedule E4 (30 tracks) includes E1 with addition of specific common views between Europe and South America or South Africa. You are invited to follow the complete schedule. If you find it too heavy, however, do not hesitate to use one of the sub-schedules. Yours sincerely, Claudine Thomas Head, Time Section *************************************************************************** * GPS Schedule no 29 for MJD = 50722 (1997 October 1) at 0h UTC * *************************************************************************** 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, CAO, CH, DLR, DTAG, GUM, IEN, IFAG, IPQ, LDS, Mad*, NPL, OMH, OP, ORB, PTB, ROA, SP, SU, TP, TUG, UME, VSL East North America ENA AO*, APL, NRC, USNO West North America WNA 3S Navigation*, CNM, Gold*, NIST, WWV* Hawaii H WWVH* East Asia EA BIRM, CRL, CSAO, KRIS, NAO, NIM, NRLM, SCL, SO, TL Australia and New Zealand A Can*, ATC*, ORR*, MSL, NML* India I NPLI Middle East ME INPL South Africa SAF CSIR South America SAM IGMA, ONBA, ONRJ, Kou* * Mad, Gold, Can : JPL Deep Space Network, Madrid, Goldstone, Canberra. WWV, WWVH : NIST stations in Colorado and Hawaii. AO : Arecibo Observatory. Kou: CNES Kourou Center. ATC, ORR and NML: Australian laboratories. 3S Navigation: Irvine, California. Other laboratories are designated by their usual acronyms (see Table 3 of the Annual Report of the BIPM Time Section, Volume 9, 1996). 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 4 minutes each day, to account for the GPS sidereal orbits. The track times were chosen to maximize elevation angles between pairs of stations. The class bytes are such that in association with the satellite number they form a unique identifyer for each common view. The European area, having numerous possible connections, has a heavy schedule. The establishment of sub-schedules permits the sharing of the work. European laboratories have been contacted to ensure the coordination of sub- schedules. Schedule no 29 ( 1 October 1997) *** Europe *** Class PRN Start Connects Subschedules h m E1 E2 E3 E4 18 25 0 2 ENA,WNA,ME,SAM * * * * 54 25 0 50 SAM,ME * * * * 4C 17 1 22 SAF,ME,I * 55 25 1 54 SAM,ME,SAF * * * * 18 3 2 26 ENA,WNA,SAM * 10 6 2 42 EA,ME,I * 54 3 2 58 SAM,ENA,WNA * * * * 4C 23 3 14 SAF,ME,I * 10 17 4 2 EA,ME,I * * * * 4C 21 4 34 SAF,ME,I * 4C 22 5 6 SAF,SAM,ME * * * * 10 23 5 54 EA,ME,I * * * * 54 15 6 10 SAM,ENA,WNA * 08 15 6 26 WNA,ENA,SAM * 10 21 6 58 EA,ME,I * * * * 10 1 7 46 EA,ME,I * 4C 31 8 2 SAF,ME * * * * 00 14 8 18 ENA,SAM,ME * 4C 29 8 34 SAF,ME,I * 00 16 9 6 ENA,SAM * * * * 00 7 9 54 ENA,WNA,SAM * * * * 4C 15 10 10 SAF,ME,I * 10 25 10 26 EA,ME,I * 54 18 10 42 SAM,SAF,ME * 00 4 10 58 ENA,WNA * * * * 48 14 11 30 ME,I * 60 18 12 2 ENA,ME * * * * 08 24 12 34 WNA,ENA * 4C 19 13 6 SAF,ME,I * * * * 54 24 13 22 SAM,ENA,WNA,ME * 07 10 14 10 ENA,WNA * * * * 10 18 14 26 EA,ME,I * 10 19 15 14 EA,ME,I * * * * 08 26 16 18 WNA,ENA,SAM * * * * 10 27 17 22 EA,ME,I * * * * 18 9 18 26 ENA,WNA,SAM * * * * 10 2 18 58 EA,ME,I * 00 23 19 14 ENA,WNA,SAM * 54 23 19 30 SAM,ENA,WNA * * * * 00 5 19 46 ENA,ME,SAM * 10 7 20 2 EA,ME,I * 11 7 20 34 EA,ME,I * * * * 00 30 21 6 ENA,SAM * 10 4 21 38 EA,ME,I * * * * 08 1 21 54 WNA,ENA * BC 9 22 26 ME,SAF,I * 10 24 22 42 EA,ME,I * * * * 10 5 23 14 EA,ME,I * Schedule no 29 ( 1 October 1997) *** 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 18 25 0 2 WNA,E,ME,SAM 18 25 0 2 ENA,E,ME,SAM 28 18 0 34 WNA,H 18 16 0 18 WNA,H 18 16 0 18 ENA,H 18 18 0 50 ENA,WNA,H 18 18 0 50 WNA,EA,H 28 18 0 34 EA,H 98 26 1 54 A,I 18 3 2 26 WNA,E,SAM 18 18 0 50 ENA,EA,H 3C 4 2 10 A,H 68 31 2 42 SAM,WNA 18 3 2 26 ENA,E,SAM 10 6 2 42 E,ME,I 54 3 2 58 E,SAM,WNA 68 31 2 42 ENA,SAM 3C 24 2 58 A,H 19 18 3 14 WNA,H 54 3 2 58 E,SAM,ENA 18 27 3 46 ENA,WNA,H 18 19 3 30 WNA,H 19 18 3 14 ENA,H 10 17 4 2 E,ME,I 18 27 3 46 WNA,H,EA 18 19 3 30 ENA,H 98 10 4 50 A 68 18 4 18 SAM,WNA 18 27 3 46 ENA,H,EA 98 9 5 6 A,I 19 27 4 50 WNA,H 68 18 4 18 ENA,SAM 10 23 5 54 E,ME,I 18 2 5 54 WNA,H 19 27 4 50 ENA,H 28 26 6 42 WNA,H 54 15 6 10 E,SAM,WNA 18 2 5 54 ENA,H 10 21 6 58 E,ME,I 08 15 6 26 E,WNA,SAM 54 15 6 10 E,SAM,ENA 10 1 7 46 E,ME,I 00 14 8 18 E,SAM,ME 08 15 6 26 E,ENA,SAM 20 9 8 34 ENA,WNA,H 20 9 8 34 EA,WNA,H 28 26 6 42 EA,H 20 5 9 38 ENA,WNA,H 00 16 9 6 E,SAM 20 9 8 34 ENA,EA,H 10 25 10 26 E,ME,I 18 4 9 22 WNA,H,SAM 18 4 9 22 ENA,H,SAM 98 22 10 42 A,I 20 5 9 38 EA,WNA,H 20 5 9 38 ENA,EA,H 3C 1 11 14 A,H 00 7 9 54 E,WNA,SAM 00 7 9 54 E,ENA,SAM 20 30 11 30 ENA,WNA,H 18 24 10 26 WNA,H 18 24 10 26 ENA,H 28 30 11 46 WNA,H,ENA 00 4 10 58 E,WNA 00 4 10 58 E,ENA 98 1 12 2 A 18 5 11 14 WNA 18 5 11 14 ENA 28 6 12 18 WNA,H 20 30 11 30 EA,WNA,H 20 30 11 30 ENA,EA,H 20 6 12 50 ENA,WNA,H 28 30 11 46 WNA,EA,H 28 30 11 46 EA,H,ENA 98 29 13 22 A,I 60 18 12 2 ME,E 28 6 12 18 EA,H 98 3 13 38 A,I 08 24 12 34 E,WNA 08 24 12 34 E,ENA 98 25 14 10 A,H 20 6 12 50 EA,WNA,H 20 6 12 50 ENA,EA,H 10 18 14 26 E,ME,I 54 24 13 22 E,SAM,WNA,ME 54 24 13 22 E,SAM,ENA,ME 37 3 14 58 H,I 07 10 14 10 E,WNA 07 10 14 10 E,ENA 10 19 15 14 E,ME,I 18 6 15 30 WNA,H,SAM 18 6 15 30 ENA,H,SAM 99 22 16 34 A,H 18 23 16 2 WNA,H 18 23 16 2 ENA,H 28 3 17 6 WNA,H 08 26 16 18 E,WNA,SAM 08 26 16 18 E,ENA,SAM 10 27 17 22 E,ME,I 68 9 16 34 SAM 28 3 17 6 EA,H 10 2 18 58 E,ME,I 69 9 17 54 SAM,WNA 69 9 17 54 ENA,SAM 98 14 19 14 A,H 18 17 18 10 WNA,SAM 18 17 18 10 ENA,SAM 3C 14 19 30 A,H 18 9 18 26 WNA,E,SAM 18 9 18 26 ENA,E,SAM 10 7 20 2 E,ME,I 18 21 18 42 WNA,H 18 21 18 42 ENA,H 11 7 20 34 E,ME,I 18 1 18 58 WNA,H 18 1 18 58 ENA,H 20 15 20 50 ENA,WNA,H 00 23 19 14 E,WNA,SAM 00 23 19 14 E,ENA,SAM 36 14 21 6 H 54 23 19 30 E,SAM,WNA 54 23 19 30 E,SAM,ENA 98 2 21 22 A,I 00 5 19 46 E,ME,SAM 3C 31 20 2 A,H 10 4 21 38 E,ME,I 19 25 20 34 WNA,H,SAM 19 25 20 34 ENA,H,SAM 28 14 22 10 WNA,ENA,H 20 15 20 50 EA,WNA,H 20 15 20 50 EA,ENA,H 3C 18 22 26 A,H 00 30 21 6 E,SAM 08 1 21 54 E,ENA 10 24 22 42 E,ME,I 08 1 21 54 WNA,E 28 14 22 10 EA,ENA,H 3C 7 22 58 A,H 28 14 22 10 EA,WNA,H 28 16 23 30 EA,ENA 10 5 23 14 E,ME,I 28 16 23 30 WNA,EA 28 16 23 30 WNA,ENA Schedule no 29 ( 1 October 1997) *** Hawaii *** *** Australia *** *** India *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 18 16 0 18 ENA,WNA CC 26 0 2 SAF 4C 17 1 22 E,SAF,ME 28 18 0 34 EA,WNA 3C 27 1 06 H 98 26 1 54 EA,A 18 18 0 50 ENA,WNA,EA CC 9 1 38 SAF 10 6 2 42 E,EA,ME 3C 27 1 06 A 98 26 1 54 EA,I 4C 23 3 14 E,SAF,ME 3C 4 2 10 A,EA 3C 4 2 10 H,EA 10 17 4 2 E,EA,ME 3C 2 2 42 A 3C 2 2 42 H 4C 21 4 34 E,SAF,ME 3C 24 2 58 A,EA 3C 24 2 58 H,EA 98 9 5 6 EA,A 19 18 3 14 ENA,WNA F9 4 3 30 A CC 6 5 22 A,SAF 18 19 3 30 ENA,WNA CC 30 4 18 SAF 10 23 5 54 E,EA,ME 18 27 3 46 ENA,WNA,EA F9 24 4 34 A BC 1 6 10 ME,SAF 19 27 4 50 ENA,WNA 98 10 4 50 EA 10 21 6 58 E,EA,ME 18 2 5 54 ENA,WNA 98 9 5 6 EA,I 10 1 7 46 E,EA,ME 28 26 6 42 WNA,EA CC 6 5 22 SAF,I 4C 29 8 34 E,SAF,ME 3C 5 7 14 A CD 6 5 54 SAF 4C 15 10 10 E,SAF,ME 20 9 8 34 ENA,EA,WNA 3C 5 7 14 H 10 25 10 26 E,EA,ME 3C 30 8 50 A 3C 30 8 50 H 98 22 10 42 EA,A 3C 26 9 6 A 3C 26 9 6 H 48 14 11 30 E,ME 18 4 9 22 ENA,WNA,SAM 3C 6 9 54 H BC 14 12 50 ME,SAF 20 5 9 38 ENA,EA,WNA F9 23 10 10 A 4C 19 13 6 E,SAF,ME 3C 6 9 54 A CC 3 10 26 SAF 98 29 13 22 EA,A 18 24 10 26 ENA,WNA 98 22 10 42 EA,I 98 3 13 38 EA,A 3C 1 11 14 A,EA 3C 1 11 14 H,EA 10 18 14 26 E,EA,ME 20 30 11 30 ENA,EA,WNA 98 1 12 2 EA 37 3 14 58 H,EA 28 30 11 46 WNA,EA,ENA CC 31 12 18 SAF 10 19 15 14 E,EA,ME 28 6 12 18 EA,WNA CD 31 12 34 SAF 10 27 17 22 E,EA,ME 20 6 12 50 ENA,EA,WNA 98 29 13 22 EA,I 10 2 18 58 E,EA,ME 98 25 14 10 EA,A 98 3 13 38 EA,I 10 7 20 2 E,EA,ME 3C 21 14 42 A CC 15 13 54 SAF 11 7 20 34 E,EA,ME 37 3 14 58 EA,I 98 25 14 10 EA,H 98 2 21 22 EA,A 18 6 15 30 ENA,WNA,SAM 3C 21 14 42 H 10 4 21 38 E,EA,ME 18 23 16 2 ENA,WNA CC 14 15 14 SAF BC 9 22 26 ME,SAF,E 99 22 16 34 EA,A 99 22 16 34 EA,H 10 24 22 42 E,EA,ME 28 3 17 6 WNA,EA CC 16 16 50 SAF 10 5 23 14 E,EA,ME 3C 29 18 26 A CC 18 17 38 SAF 18 21 18 42 ENA,WNA CD 18 17 54 SAF 18 1 18 58 ENA,WNA 3C 29 18 26 H 98 14 19 14 EA,A 98 14 19 14 EA,H 3C 14 19 30 A,EA 3C 14 19 30 H,EA 3C 31 20 2 A,WNA 3C 31 20 2 H,WNA 3D 31 20 18 A 3D 31 20 18 H 19 25 20 34 ENA,WNA,SAM F9 19 21 6 A 20 15 20 50 EA,ENA,WNA 98 2 21 22 EA,I 36 14 21 6 EA 3C 18 22 26 H,EA 28 14 22 10 EA,WNA,ENA 3C 7 22 58 H,EA 3C 18 22 26 A,EA F9 27 23 14 A 3C 7 22 58 A,EA Schedule no 29 ( 1 October 1997) *** Middle East *** *** South Africa *** *** South America *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 18 25 0 2 ENA,WNA,E,SAM CC 26 0 2 A 18 25 0 2 ENA,WNA,E,ME 54 25 0 50 E,SAM 4C 17 1 22 E,ME,I 54 25 0 50 E,ME 4C 17 1 22 E,SAF,I CC 9 1 38 A 55 25 1 54 E,ME,SAF 55 25 1 54 E,SAM,SAF 55 25 1 54 E,SAM,ME 18 3 2 26 ENA,WNA,E 10 6 2 42 E,EA,I 4C 23 3 14 E,ME,I 68 31 2 42 ENA,WNA 4C 23 3 14 E,SAF,I CC 30 4 18 A 54 3 2 58 E,ENA,WNA 10 17 4 2 E,EA,I 4C 21 4 34 E,ME,I 68 18 4 18 ENA,WNA 4C 21 4 34 E,SAF,I 4C 22 5 6 E,SAM,ME 4C 22 5 6 E,SAF,ME 4C 22 5 6 E,SAF,SAM CC 6 5 22 A,I 54 15 6 10 E,ENA,WNA 10 23 5 54 E,EA,I CD 6 5 54 A 08 15 6 26 E,WNA,ENA BC 1 6 10 SAF,I BC 1 6 10 ME,I 00 14 8 18 E,ENA,ME 10 21 6 58 E,EA,I 4C 31 8 2 E,ME 00 16 9 6 E,ENA 10 1 7 46 E,EA,I 4C 29 8 34 E,ME,I 18 4 9 22 ENA,WNA,H 4C 31 8 2 E,SAF CA 19 9 38 SAM CA 19 9 38 SAF 00 14 8 18 E,ENA,SAM 4C 15 10 10 E,ME,I 00 7 9 54 E,ENA,WNA 4C 29 8 34 E,SAF,I CC 3 10 26 A 54 18 10 42 E,SAF,ME 4C 15 10 10 E,SAF,I 54 18 10 42 E,SAM,ME 54 24 13 22 E,ENA,WNA,ME 10 25 10 26 E,EA,I CC 31 12 18 A BC 4 14 10 ME,SAF 54 18 10 42 E,SAM,SAF CD 31 12 34 A 18 6 15 30 ENA,WNA,H 48 14 11 30 E,I BC 14 12 50 ME,I 08 26 16 18 E,WNA,ENA 60 18 12 2 ENA,E 4C 19 13 6 E,ME,I 68 9 16 34 ENA BC 14 12 50 SAF,I CC 15 13 54 A 69 9 17 54 ENA,WNA 4C 19 13 6 E,SAF,I BC 4 14 10 ME,SAM 18 17 18 10 ENA,WNA 54 24 13 22 E,SAM,ENA,WNA CC 14 15 14 A 18 9 18 26 ENA,WNA,E BC 4 14 10 SAF,SAM CC 16 16 50 A 00 23 19 14 E,ENA,WNA 10 18 14 26 E,EA,I CC 18 17 38 A 54 23 19 30 E,ENA,WNA 10 19 15 14 E,EA,I CD 18 17 54 A 00 5 19 46 E,ENA,ME 10 27 17 22 E,EA,I CA 6 21 54 SAM,ME 19 25 20 34 ENA,WNA,H 10 2 18 58 E,EA,I BC 9 22 26 ME,I,E 00 30 21 6 E,ENA 00 5 19 46 E,ENA,SAM CA 6 21 54 SAF,ME 10 7 20 2 E,EA,I 11 7 20 34 E,EA,I 10 4 21 38 E,EA,I CA 6 21 54 SAF,SAM BC 9 22 26 SAF,I,E 10 24 22 42 E,EA,I 10 5 23 14 E,EA,I