10 September 1998 CT/GPSW.355 Dear Colleagues, Please find enclosed the tracking schedule No 31 for international time and frequency comparisons by GPS common views. The schedule should be implemented, as given in the following pages, on MJD=51087 (1 October 1998) 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 (ftp2.bipm.fr, node 193.104.126.5, subdirectory TAI) and on http://www.bipm.fr. This tracking schedule is referring its track times to MJD=50722 (1 October 1997), the reference date of the GPS schedule No 29. This has no incidence on your introduction of the schedule on 1 October 1998. The idea of setting a reference date has been adopted by the participants to the Open Forum organized by the CCTF Sub-group on GPS and GLONASS Time Transfer Standards (CGGTTS) on 1 December 1997 in Long Beach, California. It should be used from now for GPS and GLONASS International Common-View Schedules. This simplifies the use of multichannel receivers: these receivers will no longer necessitate any update at the moment of the introduction of new schedules into one-channel receivers. In the future when all one-channel receivers will be withdrawn from operation, the use of a fixed reference date for ‘all-in-view’ observations by multichannel receivers will permit to cease publication of the common-view schedules. Tracking schedule No 31 is the sixth issued by the BIPM in conformity with the Technical Directives for standardization drawn up by the CCTF 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 30 at 00 h 10 should be entered in the receiver as starting at 00 h 08. 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. ***************************************************************************************** 10 September 1998 To European Time Laboratories CT/GPSW.356 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, with a diversity of satellites observed with high elevation; · sub-schedule E2 (34 tracks) includes E1 with addition of specific common views between Europe and North America; · sub-schedule E3 (29 tracks) includes E1 with addition of specific common views between Europe and Middle East or East Asia; · sub-schedule E4 (31 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 31 * * for implementation on MJD = 51087 (1998 October 1) 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, CAO, CH, DLR, DTAG, GUM, IEN, IFAG, IPQ, LDS, Mad*, NPL, OMH, OP, ORB, PTB, RAAI*, RIRT*, 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*, AMC Hawaii H WWVH* East Asia EA BIRM, CRL, CSAO, KRIS, NAO, NIM, NRLM, PSB, 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, 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 : Australian laboratories. 3S Navigation: Irvine, California. RIRT: Russian Institute of Radionavigation and Time, Saint Petersbourg. RAAI: Romanian Academy Astronomical Institute, Bucarest. Other laboratories are designated by their usual acronyms (see Table 3 of the Annual Report of the BIPM Time Section, Volume 10, 1997). 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 track times are 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. At the request of European laboratories, European schedule is divided into four sub-schedules. 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 31 ( 1 October 1998) *** Europe *** Class PRN Start Connects Subschedules h m E1 E2 E3 E4 4C 30 0 10 SAF,ME,I * 08 22 0 26 WNA,ENA,SAM * * * * 4C 25 0 42 SAF,SAM,ME * 74 22 0 58 WNA,ME,ENA * * * * 10 6 1 14 EA,ME,I * * * * 08 3 1 30 WNA,ENA,SAM * 74 3 2 18 WNA,ME,ENA,SAM * * * * 10 17 2 50 EA,ME,I * 4C 21 3 6 SAF,ME,I * * * * 08 31 3 22 WNA,ENA,SAM * 4C 22 3 38 SAF,ME,SAM * 10 23 4 26 EA,ME,I * * * * 4C 3 5 30 SAF,ME,I * 74 15 5 46 WNA,ME,ENA,SAM * * * * 10 21 6 2 EA,ME,I * 10 1 6 50 EA,ME,I * * * * 4C 31 7 6 SAF,ME * 10 29 7 54 EA,ME,I * * * * 08 7 8 10 WNA,ENA * 10 25 8 58 EA,ME,I * 4C 15 9 14 SAF,ME,I * * * * 08 4 9 46 WNA,ENA * 74 4 10 34 WNA,ME,ENA,SAM * * * * 10 14 10 50 EA,ME,I * 08 24 11 22 WNA,ENA * 74 24 12 10 WNA,ME,ENA,SAM * * * * 08 10 12 42 WNA,ENA,SAM * 4C 4 12 58 SAF,ME,SAM * 74 10 13 30 WNA,ME,ENA,SAM * * * * 10 18 13 46 EA,ME,I * 10 19 14 34 EA,ME,I * 4C 2 14 50 SAF,ME,I * * * * 08 26 15 6 WNA,ENA,SAM * 4C 10 15 54 SAF,ME,SAM * * * * 10 27 16 10 EA,ME,I * * * * 4C 13 16 26 SAF,ME,I * 10 2 17 14 EA,ME,I * * * * 74 9 17 30 WNA,ME,ENA,SAM * * * * 08 23 17 46 WNA,ENA,SAM * 08 8 18 18 WNA,ENA,SAM * 10 7 18 50 EA,ME,I * * * * 08 1 20 10 WNA,ENA,SAM * 4C 9 20 58 SAF,ME,I * * * * 08 29 21 14 WNA,ENA,SAM * 10 24 21 30 EA,ME,I * * * * 10 5 22 2 EA,ME,I * * * * 4C 8 22 18 SAF,ME,I * 08 25 22 34 WNA,ENA,SAM * * * * Schedule no 31 ( 1 October 1998) *** 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 20 18 0 10 EA,WNA,H 20 18 0 10 ENA,EA,H 20 18 0 10 ENA,WNA,H 08 22 0 26 E,WNA,SAM 08 22 0 26 E,ENA,SAM 98 26 0 58 A,I 74 22 0 58 WNA,ME,E 74 22 0 58 ME,ENA,E 10 6 1 14 E,ME,I 32 18 1 14 H 08 3 1 30 E,ENA,SAM 28 13 2 2 WNA,H 08 3 1 30 E,WNA,SAM 18 31 1 46 ENA,SAM 98 24 2 18 A,H 18 31 1 46 WNA,SAM 28 13 2 2 EA,H 20 27 2 34 ENA,WNA,H 74 3 2 18 WNA,ME,E,SAM 74 3 2 18 ME,ENA,E,SAM 10 17 2 50 E,ME,I 20 27 2 34 EA,WNA,H 20 27 2 34 ENA,EA,H 98 9 3 38 A,I 08 31 3 22 E,WNA,SAM 08 31 3 22 E,ENA,SAM 10 23 4 26 E,ME,I 18 13 3 38 WNA,H 18 13 3 38 ENA,H 98 8 4 42 A,I 74 31 3 54 WNA,ME,SAM 74 31 3 54 ME,ENA,SAM 98 17 5 46 A,I 68 15 4 42 SAM 74 15 5 46 ME,ENA,E,SAM 10 21 6 2 E,ME,I 74 15 5 46 WNA,ME,E,SAM 18 4 7 6 SAM,ENA 98 30 6 34 A 68 27 6 18 SAM 20 9 7 38 ENA,EA,H 10 1 6 50 E,ME,I 18 4 7 6 WNA,SAM 08 7 8 10 E,ENA 20 9 7 38 ENA,WNA,H 20 9 7 38 EA,WNA,H 28 5 8 26 EA,H 10 29 7 54 E,ME,I 08 7 8 10 E,WNA 20 5 8 42 ENA,EA,H 98 23 8 10 A 20 5 8 42 EA,WNA,H 18 5 9 30 ENA,H 28 5 8 26 WNA,H 18 5 9 30 WNA,H 08 4 9 46 E,ENA 20 5 8 42 ENA,WNA,H 08 4 9 46 E,WNA 28 30 10 2 EA,H 10 25 8 58 E,ME,I 20 30 10 18 EA,WNA,H 20 30 10 18 ENA,EA,H 28 30 10 2 WNA,H 74 4 10 34 WNA,ME,E,SAM 74 4 10 34 ME,ENA,E,SAM 20 30 10 18 ENA,WNA,H 08 24 11 22 E,WNA 28 6 11 6 EA,H 98 1 10 34 A 20 6 11 38 EA,WNA,H 08 24 11 22 E,ENA 10 14 10 50 E,ME,I 74 24 12 10 WNA,ME,E,SAM 20 6 11 38 ENA,EA,H 28 6 11 6 WNA,H 18 6 12 26 WNA,H 74 24 12 10 ME,ENA,E,SAM 98 29 11 22 A 08 10 12 42 E,WNA,SAM 18 6 12 26 ENA,H 20 6 11 38 ENA,WNA,H 74 10 13 30 WNA,ME,E,SAM 08 10 12 42 E,ENA,SAM 98 3 11 54 A,I 08 26 15 6 E,WNA,SAM 74 10 13 30 ME,ENA,E,SAM 98 25 12 58 A,H 19 6 15 22 WNA,SAM 08 26 15 6 E,ENA,SAM 10 18 13 46 E,ME,I 74 26 15 38 WNA,ME 19 6 15 22 ENA,SAM 10 19 14 34 E,ME,I 18 21 16 58 WNA,H 74 26 15 38 ME,ENA 98 15 15 38 A 74 9 17 30 WNA,ME,E,SAM 18 21 16 58 ENA,H 10 27 16 10 E,ME,I 08 23 17 46 E,WNA,SAM 74 9 17 30 ME,ENA,E,SAM 10 2 17 14 E,ME,I 08 8 18 18 E,WNA,SAM 08 23 17 46 E,ENA,SAM 98 19 17 30 A,I 32 1 18 34 H 08 8 18 18 E,ENA,SAM 98 14 18 2 A,H 32 29 19 6 H 74 8 19 22 ME,ENA 10 7 18 50 E,ME,I 74 8 19 22 WNA,ME 20 15 19 38 ENA,EA,H 98 16 19 22 A 20 15 19 38 EA,WNA,H 19 21 19 54 ENA,SAM 20 15 19 38 ENA,WNA,H 19 21 19 54 WNA,SAM 08 1 20 10 E,ENA,SAM 98 2 20 26 A,I 08 1 20 10 E,WNA,SAM 28 14 20 42 EA,H,ENA 28 14 20 42 WNA,H,ENA 28 14 20 42 WNA,EA,H 20 14 20 58 ENA,EA,H 20 14 20 58 ENA,WNA,H 20 14 20 58 EA,WNA,H 08 29 21 14 E,ENA,SAM 10 24 21 30 E,ME,I 08 29 21 14 E,WNA,SAM 18 14 22 2 ENA,H 10 5 22 2 E,ME,I 18 14 22 2 WNA,H 28 16 22 18 EA,H 28 16 22 18 WNA,H 08 25 22 34 E,WNA,SAM 08 25 22 34 E,ENA,SAM 98 7 22 34 A 74 25 22 50 WNA,ME,SAM 74 25 22 50 ME,ENA,SAM 98 13 23 6 A 20 16 23 34 EA,WNA,H 20 16 23 34 ENA,EA,H 20 16 23 34 ENA,WNA,H Schedule no 31 ( 1 October 1998) *** Hawaii *** *** Australia *** *** India *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 20 18 0 10 ENA,EA,WNA 98 26 0 58 EA,I 4C 30 0 10 E,SAF,ME 38 24 0 26 I 3C 2 1 30 H 38 24 0 26 H 32 18 1 14 ENA 3C 24 1 46 H 98 26 0 58 EA,A 3C 2 1 30 A CC 5 2 2 SAF 10 6 1 14 E,EA,ME 3C 24 1 46 A 98 24 2 18 EA,H A4 30 1 30 SAF 28 13 2 2 WNA,EA CC 8 2 34 SAF 10 17 2 50 E,EA,ME 98 24 2 18 EA,A CC 30 3 22 SAF 4C 21 3 6 E,SAF,ME 20 27 2 34 ENA,EA,WNA 98 9 3 38 EA,I 98 9 3 38 EA,A 3B 18 2 50 SAM CC 6 4 10 SAF 10 23 4 26 E,EA,ME 18 13 3 38 WNA,ENA 3C 10 4 26 H 98 8 4 42 EA,A 3C 10 4 26 A 98 8 4 42 EA,I AC 8 4 58 A 38 9 5 14 I AC 8 4 58 I 38 9 5 14 H 3C 5 6 2 A 98 17 5 46 EA,I 4C 3 5 30 E,SAF,ME 20 9 7 38 ENA,EA,WNA 3C 5 6 2 H 98 17 5 46 EA,A 3C 26 7 54 A 98 30 6 34 EA 10 21 6 2 E,EA,ME 28 5 8 26 WNA,EA 3C 26 7 54 H 10 1 6 50 E,EA,ME 20 5 8 42 ENA,EA,WNA 98 23 8 10 EA 10 29 7 54 E,EA,ME 3C 6 8 58 A CC 22 8 26 SAF 10 25 8 58 E,EA,ME 18 5 9 30 WNA,ENA CD 22 8 42 SAF 4C 15 9 14 E,SAF,ME 28 30 10 2 WNA,EA 3C 6 8 58 H 10 14 10 50 E,EA,ME 20 30 10 18 ENA,EA,WNA CC 3 9 30 SAF 98 3 11 54 EA,A 3C 17 10 50 A 98 1 10 34 EA A4 16 13 14 SAF 28 6 11 6 WNA,EA 3C 17 10 50 H 10 18 13 46 E,EA,ME 20 6 11 38 ENA,EA,WNA CC 31 11 6 SAF 10 19 14 34 E,EA,ME 18 6 12 26 WNA,ENA 98 29 11 22 EA 4C 2 14 50 E,SAF,ME 98 25 12 58 EA,A 98 3 11 54 EA,I 10 27 16 10 E,EA,ME 3C 21 13 46 A CC 15 12 42 SAF 4C 13 16 26 E,SAF,ME 3B 6 14 18 SAM 98 25 12 58 EA,H A4 7 16 42 SAF 3C 22 16 26 A 3C 21 13 46 H 10 2 17 14 E,EA,ME 18 21 16 58 WNA,ENA CC 14 14 2 SAF 98 19 17 30 EA,A 98 14 18 2 EA,A 98 15 15 38 EA 10 7 18 50 E,EA,ME 3C 14 18 18 A CC 16 16 10 SAF 98 2 20 26 EA,A 32 1 18 34 ENA 3C 22 16 26 H 4C 9 20 58 E,SAF,ME 32 29 19 6 ENA CC 18 16 58 SAF 10 24 21 30 E,EA,ME 3B 25 19 22 SAM CD 18 17 14 SAF 10 5 22 2 E,EA,ME 20 15 19 38 ENA,EA,WNA 98 19 17 30 EA,I 4C 8 22 18 E,SAF,ME 3C 31 19 54 A 98 14 18 2 EA,H 38 4 22 34 H 28 14 20 42 WNA,EA,ENA 3C 14 18 18 H 20 14 20 58 ENA,EA,WNA CC 13 19 6 SAF 18 14 22 2 WNA,ENA 98 16 19 22 EA 28 16 22 18 WNA,EA CD 13 19 38 SAF 38 4 22 34 I 3C 31 19 54 H 3C 19 22 50 A CC 10 20 10 SAF 20 16 23 34 ENA,EA,WNA 98 2 20 26 EA,I CD 10 20 42 SAF 98 7 22 34 EA 3C 19 22 50 H 98 13 23 6 EA Schedule no 31 ( 1 October 1998) *** Middle East *** *** South Africa *** *** South America *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 4C 30 0 10 E,SAF,I 4C 30 0 10 E,ME,I 08 22 0 26 E,WNA,ENA 4C 25 0 42 E,SAF,SAM 4C 25 0 42 E,SAM,ME 4C 25 0 42 E,SAF,ME 74 22 0 58 WNA,ENA,E A4 30 1 30 I 08 3 1 30 E,WNA,ENA 10 6 1 14 E,EA,I CC 5 2 2 A 18 31 1 46 WNA,ENA 74 3 2 18 WNA,ENA,E,SAM CC 8 2 34 A 74 3 2 18 WNA,ME,ENA,E 10 17 2 50 E,EA,I 4C 21 3 6 E,ME,I 3B 18 2 50 H 4C 21 3 6 E,SAF,I CC 30 3 22 A 08 31 3 22 E,WNA,ENA 4C 22 3 38 E,SAF,SAM 4C 22 3 38 E,ME,SAM 4C 22 3 38 E,SAF,ME 74 31 3 54 WNA,ENA,SAM CC 6 4 10 A 74 31 3 54 WNA,ME,ENA 10 23 4 26 E,EA,I 4C 3 5 30 E,ME,I 68 15 4 42 ENA 4C 3 5 30 E,SAF,I 4C 31 7 6 E,ME 74 15 5 46 WNA,ME,ENA,E 74 15 5 46 WNA,ENA,E,SAM CA 18 8 10 SAM 68 27 6 18 ENA 10 21 6 2 E,EA,I CC 22 8 26 A 18 4 7 6 WNA,ENA 10 1 6 50 E,EA,I CD 22 8 42 A CA 18 8 10 SAF 4C 31 7 6 E,SAF 4C 15 9 14 E,ME,I 74 4 10 34 WNA,ME,ENA,E 10 29 7 54 E,EA,I CC 3 9 30 A CA 27 10 50 SAF 10 25 8 58 E,EA,I CA 27 10 50 SAM 74 24 12 10 WNA,ME,ENA,E 4C 15 9 14 E,SAF,I CC 31 11 6 A CA 7 12 26 SAF 74 4 10 34 WNA,ENA,E,SAM CA 7 12 26 SAM 08 10 12 42 E,WNA,ENA 10 14 10 50 E,EA,I CC 15 12 42 A 4C 4 12 58 E,SAF,ME 74 24 12 10 WNA,ENA,E,SAM 4C 4 12 58 E,ME,SAM 74 10 13 30 WNA,ME,ENA,E 4C 4 12 58 E,SAF,SAM A4 16 13 14 I 3B 6 14 18 H 74 10 13 30 WNA,ENA,E,SAM CC 14 14 2 A 08 26 15 6 E,WNA,ENA 10 18 13 46 E,EA,I 4C 2 14 50 E,ME,I 19 6 15 22 WNA,ENA 10 19 14 34 E,EA,I 4C 10 15 54 E,ME,SAM 4C 10 15 54 E,SAF,ME 4C 2 14 50 E,SAF,I CC 16 16 10 A 74 9 17 30 WNA,ME,ENA,E 74 26 15 38 WNA,ENA 4C 13 16 26 E,ME,I 08 23 17 46 E,WNA,ENA 4C 10 15 54 E,SAF,SAM A4 7 16 42 I 08 8 18 18 E,WNA,ENA 10 27 16 10 E,EA,I CC 18 16 58 A 3B 25 19 22 H 4C 13 16 26 E,SAF,I CD 18 17 14 A 19 21 19 54 WNA,ENA 10 2 17 14 E,EA,I CC 13 19 6 A 08 1 20 10 E,WNA,ENA 74 9 17 30 WNA,ENA,E,SAM CD 13 19 38 A 08 29 21 14 E,WNA,ENA 10 7 18 50 E,EA,I CC 10 20 10 A 08 25 22 34 E,WNA,ENA 74 8 19 22 WNA,ENA CD 10 20 42 A 74 25 22 50 WNA,ME,ENA 4C 9 20 58 E,SAF,I 4C 9 20 58 E,ME,I 10 24 21 30 E,EA,I 4C 8 22 18 E,ME,I 10 5 22 2 E,EA,I 4C 8 22 18 E,SAF,I 74 25 22 50 WNA,ENA,SAM