5 March 1998 CT/GPSW.340 Dear Colleagues, Please find enclosed the tracking schedule No 30 for international time and frequency comparisons by GPS common views. The schedule should be implemented on MJD=50902 (30 March 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 (node 145.238.2.2 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 previous schedule. This 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 In the future when all one-channel receivers will be withdrawn from operation, the use of a fixed reference date for ‘all-in-view’ observations by multichannel receivers will permit to cease publication of the common-view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 30 is the fifth 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 24 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. 5 March 1998 To European Time Laboratories CT/GPSW.343 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 (31 tracks) includes E1 with addition of specific common views between Europe and Middle East or East Asia; · sub-schedule E4 (29 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 30 * * for implementation on MJD = 50902 (1998 March 30) 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, 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: 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 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. At the request of European laboratories, European schedule was 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. GPS Schedule no 30 (30 March 1998) *** Europe *** Class PRN Start Connects Subschedules h m E1 E2 E3 E4 08 24 0 2 WNA,ENA * * * * 4C 19 0 34 SAF,ME,I * 54 24 0 50 SAM,ENA,WNA,ME * * * * 10 18 1 54 EA,ME,I * * * * 00 10 2 10 ENA,WNA,ME * 10 19 3 14 EA,ME,I * * * * 08 26 3 46 WNA,ENA,SAM * * * * 10 27 4 50 EA,ME,I * 4C 13 5 6 SAF,ME,I * * * * 18 9 5 54 ENA,WNA,SAM * * * * 10 2 6 26 EA,ME,I * 00 23 6 42 ENA,WNA,SAM * 54 23 6 58 SAM,ENA,WNA * * * * 00 5 7 14 ENA,ME,SAM * 10 7 7 30 EA,ME,I * 11 7 8 2 EA,I * * * * 00 30 8 34 ENA,SAM * * * * 08 1 9 22 WNA,ENA * * * * 10 4 9 38 EA,ME,I * BC 9 9 54 ME,SAF,I * 10 24 10 10 EA,ME,I * 10 5 10 58 EA,ME,I * * * * 19 25 11 30 ENA,WNA,ME,SAM * 54 25 12 14 SAM,ME * * * * 4C 17 12 46 SAF,ME,I * * * * 18 3 13 50 ENA,WNA,SAM * 10 6 14 6 EA,ME,I * * * * 54 3 14 22 SAM,ENA,WNA * 4C 23 14 38 SAF,ME,I * 10 17 15 10 EA,ME,I * * * * 4C 21 15 58 SAF,ME,I * * * * 4C 22 16 30 SAF,SAM * 10 23 17 18 EA,ME,I * * * * 54 15 17 34 SAM,ENA,WNA * 08 15 17 50 WNA,ENA,SAM * 10 21 18 22 EA,ME,I * * * * 4C 29 18 54 SAF,ME,I * 10 1 19 10 EA,ME,I * 4C 31 19 26 SAF,ME * * * * 00 14 19 42 ENA,SAM,ME * 00 16 20 30 ENA,SAM * * * * 00 7 21 18 ENA,WNA,SAM * 4C 15 21 34 SAF,ME,I * * * * 10 25 21 50 EA,ME,I * 54 18 22 6 SAM,SAF,ME * 00 4 22 22 ENA,WNA * * * * 48 14 22 54 ME,I * 60 18 23 26 ENA,ME * GPS Schedule no 30 (30 March 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 08 24 0 2 E,WNA 08 24 0 2 E,ENA 20 6 0 18 ENA,WNA,H 20 6 0 18 EA,WNA,H 20 6 0 18 ENA,EA,H 98 3 1 6 A,I 54 24 0 50 E,SAM,WNA,ME 54 24 0 50 E,SAM,ENA,ME 98 25 1 38 A,H 00 10 2 10 E,WNA,ME 00 10 2 10 E,ENA,ME 10 18 1 54 E,ME,I 18 6 2 58 WNA,H,SAM 18 6 2 58 ENA,H,SAM 36 3 2 26 H,I 18 23 3 30 WNA,H 18 23 3 30 ENA,H 10 19 3 14 E,ME,I 08 26 3 46 E,WNA,SAM 08 26 3 46 E,ENA,SAM 28 3 4 2 WNA,H 74 26 4 34 WNA,ME 28 3 4 2 EA,H 29 3 4 18 WNA,H 68 9 5 22 SAM,WNA 29 3 4 18 EA,H 10 27 4 50 E,ME,I 18 17 5 38 WNA,SAM 74 26 4 34 ME,ENA 10 2 6 26 E,ME,I 18 9 5 54 WNA,E,SAM 68 9 5 22 ENA,SAM 98 14 6 42 A,H 18 21 6 10 WNA,H 18 17 5 38 ENA,SAM 3C 14 6 58 A,H 18 1 6 26 WNA,H 18 9 5 54 ENA,E,SAM 10 7 7 30 E,ME,I 00 23 6 42 E,WNA,SAM 18 21 6 10 ENA,H 11 7 8 2 E,I 54 23 6 58 E,SAM,WNA 18 1 6 26 ENA,H 20 15 8 18 ENA,WNA,H 00 5 7 14 E,ME,SAM 00 23 6 42 E,ENA,SAM 36 16 8 34 H,A 18 25 7 46 WNA,SAM 54 23 6 58 E,SAM,ENA 98 2 8 50 A,I 68 25 8 2 SAM,H 18 25 7 46 ENA,SAM 10 4 9 38 E,ME,I 20 15 8 18 EA,WNA,H 74 8 8 2 ME 28 14 9 54 WNA,ENA,H 00 30 8 34 E,SAM 20 15 8 18 EA,ENA,H 10 24 10 10 E,ME,I 08 1 9 22 WNA,E 08 1 9 22 E,ENA 3C 7 10 26 A,H 28 14 9 54 EA,WNA,H 28 14 9 54 EA,ENA,H 10 5 10 58 E,ME,I 68 1 10 10 SAM 18 16 11 14 ENA,H,EA 18 16 11 14 ENA,WNA,H 18 16 11 14 WNA,H,EA 19 25 11 30 ENA,E,ME,SAM 28 18 11 58 WNA,H 19 25 11 30 WNA,E,ME,SAM 28 18 11 58 EA,H 3C 13 12 14 A,H 18 18 12 46 WNA,EA,H 18 18 12 46 ENA,EA,H 18 18 12 46 ENA,WNA,H 18 3 13 50 WNA,E,SAM 18 3 13 50 ENA,E,SAM 98 26 13 18 A,I 68 31 14 6 SAM,WNA 68 31 14 6 ENA,SAM 3C 4 13 34 A,H 54 3 14 22 E,SAM,WNA 54 3 14 22 E,SAM,ENA 10 6 14 6 E,ME,I 19 18 14 38 WNA,H 19 18 14 38 ENA,H 3C 24 14 22 A,H 18 27 15 26 WNA,H,EA 74 3 14 54 ME 10 17 15 10 E,ME,I 68 18 15 42 SAM,WNA 18 27 15 26 ENA,H,EA 18 27 15 26 ENA,WNA,H 19 27 16 14 WNA,H 68 18 15 42 ENA,SAM 98 9 16 30 A,I 18 2 17 18 WNA,H 19 27 16 14 ENA,H 10 23 17 18 E,ME,I 54 15 17 34 E,SAM,WNA 74 31 17 2 ME 28 26 18 6 WNA,H 08 15 17 50 E,WNA,SAM 18 2 17 18 ENA,H 10 21 18 22 E,ME,I 68 27 18 38 SAM 54 15 17 34 E,SAM,ENA 10 1 19 10 E,ME,I 00 14 19 42 E,SAM,ME 08 15 17 50 E,ENA,SAM 98 23 19 42 A,I 20 9 20 14 EA,WNA,H 28 26 18 6 EA,H 98 30 19 58 A,H 00 16 20 30 E,SAM 20 9 20 14 ENA,EA,H 20 9 20 14 ENA,WNA,H 18 4 20 46 WNA,H,SAM 18 4 20 46 ENA,H,SAM 20 5 21 34 ENA,WNA,H 00 7 21 18 E,WNA,SAM 00 7 21 18 E,ENA,SAM 10 25 21 50 E,ME,I 20 5 21 34 EA,WNA,H 20 5 21 34 ENA,EA,H 98 22 22 6 A,I 18 24 21 50 WNA,H 18 24 21 50 ENA,H 3C 1 22 38 A,H 00 4 22 22 E,WNA 00 4 22 22 E,ENA 20 30 22 54 ENA,WNA,H 20 30 22 54 EA,WNA,H 20 30 22 54 ENA,EA,H 28 30 23 10 WNA,H,ENA 28 30 23 10 WNA,EA,H 28 30 23 10 EA,H,ENA 98 1 23 26 A 60 18 23 26 ME,E 28 6 23 42 EA,H 28 6 23 42 WNA,H GPS Schedule no 30 (30 March 1998) *** Hawaii *** *** Australia *** *** India *** Class PRN Start Connects Class PRN Start Connects Class PRN Start Connects h m h m h m 20 6 0 18 ENA,EA,WNA CC 31 0 2 SAF BC 14 0 18 ME,SAF 98 25 1 38 EA,A 98 3 1 6 EA,I 4C 19 0 34 E,SAF,ME 3C 25 1 54 A CC 15 1 22 SAF 98 3 1 6 EA,A 3C 21 2 10 A 98 25 1 38 EA,H 10 18 1 54 E,EA,ME 36 3 2 26 EA,I 3C 25 1 54 H 36 3 2 26 H,EA 18 6 2 58 ENA,WNA,SAM 3C 21 2 10 H 10 19 3 14 E,EA,ME 18 23 3 30 ENA,WNA F9 29 2 26 A 10 27 4 50 E,EA,ME 28 3 4 2 WNA,EA CC 14 2 58 SAF 4C 13 5 6 E,SAF,ME 29 3 4 18 WNA,EA CC 16 4 18 SAF 10 2 6 26 E,EA,ME 18 21 6 10 ENA,WNA CC 18 5 22 SAF 10 7 7 30 E,EA,ME 18 1 6 26 ENA,WNA CD 18 5 38 SAF AC 27 7 46 A 98 14 6 42 EA,A 98 14 6 42 EA,H 11 7 8 2 E,EA 3C 14 6 58 A,EA 3C 14 6 58 H,EA 98 2 8 50 EA,A 68 25 8 2 SAM,ENA AC 27 7 46 I 10 4 9 38 E,EA,ME 20 15 8 18 EA,ENA,WNA CC 13 8 18 SAF BC 9 9 54 ME,SAF,E 36 16 8 34 EA,A 36 16 8 34 EA,H 10 24 10 10 E,EA,ME 28 14 9 54 EA,WNA,ENA 98 2 8 50 EA,I 10 5 10 58 E,EA,ME 3C 7 10 26 A,EA CC 10 9 6 SAF 4C 17 12 46 E,SAF,ME 18 16 11 14 ENA,WNA,EA CD 10 9 38 SAF 98 26 13 18 EA,A 28 18 11 58 EA,WNA 3C 7 10 26 H,EA 10 6 14 6 E,EA,ME 3C 13 12 14 A,EA F9 27 10 42 A 4C 23 14 38 E,SAF,ME 3C 27 12 30 A CC 26 11 30 SAF 10 17 15 10 E,EA,ME 18 18 12 46 ENA,WNA,EA 3C 13 12 14 H,EA 4C 21 15 58 E,SAF,ME 3C 4 13 34 A,EA 3C 27 12 30 H 98 9 16 30 EA,A 3C 2 14 6 A CC 9 13 2 SAF CC 6 16 46 A,SAF 3C 24 14 22 A,EA 98 26 13 18 EA,I 10 23 17 18 E,EA,ME 19 18 14 38 ENA,WNA 3C 4 13 34 H,EA BC 1 17 34 ME,SAF 18 27 15 26 ENA,WNA,EA 3C 2 14 6 H 10 21 18 22 E,EA,ME 19 27 16 14 ENA,WNA 3C 24 14 22 H,EA 4C 29 18 54 E,SAF,ME 18 2 17 18 ENA,WNA CC 8 14 54 SAF 10 1 19 10 E,EA,ME 28 26 18 6 WNA,EA F9 4 15 10 A 98 23 19 42 EA,A 3C 5 18 38 A F9 24 15 58 A 4C 15 21 34 E,SAF,ME 98 30 19 58 A,EA CC 30 16 14 SAF 10 25 21 50 E,EA,ME 20 9 20 14 ENA,EA,WNA 98 9 16 30 EA,I 98 22 22 6 EA,A 3C 26 20 30 A CC 6 16 46 SAF,I 48 14 22 54 E,ME 18 4 20 46 ENA,WNA,SAM CD 6 17 2 SAF 3C 6 21 18 A 3C 5 18 38 H 20 5 21 34 ENA,EA,WNA 98 23 19 42 EA,I 18 24 21 50 ENA,WNA 98 30 19 58 EA,H 3C 1 22 38 A,EA 3C 26 20 30 H 20 30 22 54 ENA,EA,WNA CC 22 20 46 SAF 28 30 23 10 WNA,EA,ENA 3C 6 21 18 H 28 6 23 42 EA,WNA F9 23 21 34 A CC 3 21 50 SAF 98 22 22 6 EA,I 3C 1 22 38 H,EA 98 1 23 26 EA CD 31 23 42 SAF GPS Schedule no 30 (30 March 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 BC 14 0 18 SAF,I CC 31 0 2 A 54 24 0 50 E,ENA,WNA,ME 4C 19 0 34 E,SAF,I BC 14 0 18 ME,I BC 4 1 38 ME,SAF 54 24 0 50 E,SAM,ENA,WNA 4C 19 0 34 E,ME,I 18 6 2 58 ENA,WNA,H BC 4 1 38 SAF,SAM CC 15 1 22 A 08 26 3 46 E,WNA,ENA 10 18 1 54 E,EA,I BC 4 1 38 ME,SAM 68 9 5 22 ENA,WNA 00 10 2 10 E,ENA,WNA CC 14 2 58 A 18 17 5 38 ENA,WNA 10 19 3 14 E,EA,I CC 16 4 18 A 18 9 5 54 ENA,WNA,E 74 26 4 34 WNA,ENA 4C 13 5 6 E,ME,I 00 23 6 42 E,ENA,WNA 10 27 4 50 E,EA,I CC 18 5 22 A 54 23 6 58 E,ENA,WNA 4C 13 5 6 E,SAF,I CD 18 5 38 A 00 5 7 14 E,ENA,ME 10 2 6 26 E,EA,I CC 13 8 18 A 18 25 7 46 ENA,WNA 00 5 7 14 E,ENA,SAM CC 10 9 6 A 68 25 8 2 ENA,H 10 7 7 30 E,EA,I CA 6 9 22 SAM,ME 00 30 8 34 E,ENA 74 8 8 2 WNA CD 10 9 38 A CA 6 9 22 SAF,ME CA 6 9 22 SAF,SAM BC 9 9 54 ME,I,E 68 1 10 10 ENA 10 4 9 38 E,EA,I CA 23 10 26 SAM CA 23 10 26 SAF BC 9 9 54 SAF,I,E CC 26 11 30 A 19 25 11 30 ENA,WNA,E,ME 10 24 10 10 E,EA,I 4C 17 12 46 E,ME,I 54 25 12 14 E,ME 10 5 10 58 E,EA,I CC 9 13 2 A 18 3 13 50 ENA,WNA,E 19 25 11 30 ENA,WNA,E,SAM 4C 23 14 38 E,ME,I 68 31 14 6 ENA,WNA 54 25 12 14 E,SAM CC 8 14 54 A 54 3 14 22 E,ENA,WNA 4C 17 12 46 E,SAF,I 4C 21 15 58 E,ME,I 68 18 15 42 ENA,WNA 10 6 14 6 E,EA,I CC 30 16 14 A 4C 22 16 30 E,SAF 4C 23 14 38 E,SAF,I 4C 22 16 30 E,SAM 54 15 17 34 E,ENA,WNA 74 3 14 54 WNA CC 6 16 46 A,I 08 15 17 50 E,WNA,ENA 10 17 15 10 E,EA,I CD 6 17 2 A 68 27 18 38 ENA 4C 21 15 58 E,SAF,I BC 1 17 34 ME,I 00 14 19 42 E,ENA,ME 74 31 17 2 WNA 4C 29 18 54 E,ME,I C2 14 19 58 ME 10 23 17 18 E,EA,I 4C 31 19 26 E,ME 00 16 20 30 E,ENA BC 1 17 34 SAF,I CC 22 20 46 A 18 4 20 46 ENA,WNA,H 10 21 18 22 E,EA,I CA 19 21 2 SAM CA 19 21 2 SAF 4C 29 18 54 E,SAF,I 4C 15 21 34 E,ME,I 00 7 21 18 E,ENA,WNA 10 1 19 10 E,EA,I CC 3 21 50 A 54 18 22 6 E,SAF,ME 4C 31 19 26 E,SAF 54 18 22 6 E,SAM,ME C2 18 22 22 ME 00 14 19 42 E,ENA,SAM CA 27 22 38 SAM CA 27 22 38 SAF C2 14 19 58 SAM CD 31 23 42 A 4C 15 21 34 E,SAF,I 10 25 21 50 E,EA,I 54 18 22 6 E,SAM,SAF C2 18 22 22 SAM 48 14 22 54 E,I 60 18 23 26 ENA,E