GPS World, December 2009

Orbit Data and Resources on Active GNSS Satellites ALMANAC THE GPS Constellation SV PRN CLOCK LAUNCHED USABLE PLANE SLOT NOTES TYPE Block IIA 23 32 Rb 11 26 90 2 26 08 E5 24 24 Cs 7 4 91 D5 A 25 25 Rb 2 23 92 3 24 92 A5 B 26 26 Rb 7 7 92 7 23 92 F5 27 27 Cs 9 9 92 9 30 92 A6 39 09 Cs 6 26 93 7 20 93 A1 34 04 Rb 10 26 93 11 22 93 D4 36 06 Rb 3 10 94 3 28 94 C5 33 03 Cs 3 28 96 4 9 96 C2 40 10 Cs 7 16 96 8 15 96 E6 C 30 30 Cs 9 12 96 10 1 96 B2 38 08 Rb 11 6 97 12 18 97 A3 D TYPE Block IIR 43 13 Rb 7 23 97 1 31 98 F3 46 11 Rb 10 7 99 1 3 00 D2 51 20 Rb 5 11 00 6 1 00 E1 44 28 Rb 7 16 00 8 17 00 B3 41 14 Rb 11 10 00 12 10 00 F1 54 18 Rb 1 30 01 2 15 01 E4 56 16 Rb 1 29 03 2 18 03 B1 45 21 Rb 3 31 03 4 12 03 D3 47 22 Rb 12 21 03 12 1 04 E2 59 19 Rb 3 20 04 4 5 04 C3 60 23 Rb 6 23 04 7 9 04 F4 61 02 Rb 11 6 04 11 22 04 D1 TYPE Block IIR M 53 17 Rb 9 26 05 12 16 05 C4 52 31 Rb 9 25 06 10 12 06 A2 58 12 Rb 11 17 06 12 13 06 B4 55 15 Rb 10 17 07 10 31 07 F2 57 29 Rb 12 20 07 1 2 08 C1 48 07 Rb 3 15 08 3 24 08 A4 49 01 Rb 3 24 09 B2 E 50 05 Rb 8 17 09 8 27 09 E3 F GLONASS Constellation GLONASS NUMBER KOSMOS NUMBER LAUNCHED USABLE ALMANAC SLOT NUMBER CHANNEL ORBIT PLANE NOTES 92 701 2404 12 10 03 12 9 04 6 4 1 A 94 795 2403 12 10 03 1 30 04 B 95 712 2413 12 26 04 6 10 05 7 5 1 99 713 2418 12 25 05 8 31 06 24 2 3 C 100 714 2419 12 25 05 8 31 06 23 3 3 101 715 2424 12 25 06 4 3 07 14 7 2 102 716 2425 12 25 06 10 12 07 15 0 2 103 717 2426 12 25 06 4 3 07 10 7 2 104 718 2431 10 26 07 12 4 07 17 4 3 105 719 2432 10 26 07 11 27 07 20 2 3 106 720 2433 10 26 07 11 25 07 19 3 3 107 721 2434 12 25 07 2 8 08 13 2 2 108 722 2435 12 25 07 1 25 08 9 2 2 D 109 723 2436 12 25 07 1 22 08 11 0 2 110 724 2442 9 25 08 10 26 08 18 3 3 111 725 2443 9 25 08 11 5 08 21 4 3 112 726 2444 9 25 08 11 13 08 22 3 3 E 113 727 2447 12 25 08 1 17 09 3 5 1 114 728 2448 12 25 08 1 20 09 2 4 1 F 115 729 2449 12 25 08 2 12 09 8 6 1 General Notes 1 SV Number refers to space vehicle number PRN Number refers to the satellites unique pseudorandom noise code 2 Clock Rb rubidium Cs cesium Only clock changes made since this Almanac was last published in December are included in the performance notes 3 Launched and Usable dates are based on Universal Time 4 The current GPS constellation consists of 11 usable Block IIA satellites 12 Block IIRs and 7 Block IIR Ms for a total of 30 satellites and is under FOC Full Operational Capability 5 SVN35 and 36 carry onboard corner cube reflectors for satellite laser ranging SLR SLR tracking of the satellites permits analysts to differentiate between onboard clock errors and satellite ephemeris errors in GPS tracking SVN35 PRN05 was decommissioned from active service on March 26 2009 6 Selective availability SA was set to zero on all satellites by presidential order on May 2 2000 at approximately 4 00 UT Previous Almanacs provide a history of SA status 7 Antispoofing AS was activated on January 31 1994 on all Block IIs AS is occasionally off for testing and other purposes Previous Almanacs provide a history of AS status 8 The design life of Block II IIA vehicles is 75 years with a mean mission duration goal of 6 years Block IIR satellites are designed for a mean mission duration of 75 years and a design life of 10 years 9 GPS World believes this information to be correct as of press time However because of the satellite constellations evolving nature readers should contact GPS information services listed on these pages for more current data 10 Dr Richard Langley of the University of New Brunswick provided the GPS satellite status information and compiled the notes Performance Notes A SVN24 PRN24 removed from active service on September 12 2009 Continues to transmit L band signals but excluded from almanacs Set unhealthy in ephemerides B SVN25 PRN25 was decommissioned from active service on August 20 2009 Returned to active service on September 12 2009 C SVN40 PRN10 being rephased to orbital slot E6 D SVN38 PRN08 active clock switched from Cs3 to Rb1 on October 15 2009 E SVN49 PRN01 remains set unusable until an L1 L2 satellite multipath issue is resolved F SVN50 PRN05 was launched on August 17 2009 L1 L2 transmissions began on August 21 2009 Set healthy on August 27 2009 General Notes 1 The first GLONASS satellite was launched October 12 1982 2 The GLONASS numbering scheme used in this table includes the eight dummy satellites orbited as ballast along with real satellites on the first seven GLONASS launches The second number in parentheses in the GLONASS Number column is that assigned by the Russian Space Forces 3 The Russian Federation designated the Kosmos Number 4 GLONASS numbers 1 91 have been withdrawn from service 5 All operational satellites are GLONASS M satellites 6 All launch and usable dates are based on Moscow Time Universal Time 3 hours 7 Channel number k indicates L1 and L2 carrier frequencies L1 1602 1 05625 k MHz L2 1246 04375 k MHz 8 All GLONASS satellites use cesium atomic clocks 9 Sixteen GLONASS satellites are healthy 10 The latest triple GLONASS launch was on December 25 2008 The next launch is scheduled for December 2009 11 New GLONASS channel allocations were introduced September 1993 to reduce interference to radio astronomy Note the use of the same channel on pairs of antipodal satellites 12 GPS World believes this information to be correct as of press time However because of the satellite constellations evolving nature we encourage readers to contact the GLONASS sources listed on these pages for more current information 13 Information compiled by Richard Langley Performance Notes A GLONASS 92 has been set unhealthy since June 18 2009 Frequency channel switched from 1 to 4 on September 14 2009 B GLONASS 94 had been set unhealthy since April 30 2009 and was removed from service on August 18 2009 C GLONASS 99 has been set unhealthy since November 2 2009 D L2 signals of GLONASS 108 are unusable E GLONASS 112 has been set unhealthy since August 31 2009 F GLONASS 114 frequency channel switched from 1 to 4 on September 14 2009 GPS Satellite System Information International GNSS Service http igscb jpl nasa gov National Executive Committee for Space Based Positioning Navigation Timing www pnt gov 2nd Space Operations Squadron http gps afspc af mil gps U S Coast Guard Navigation Center www navcen uscg gov GLONASS Satellite Information The Information Analytical Center IAC of the Russian Space Agency www glonass ianc rsa ru publishes official information about GLONASS status and plans as well as consultation information and scientific method services to increase GLONASS applications efficiency It provides current constellations Earth maps of the current and daily navigation availabilities results of GNSS navigation fields monitoring in the Moscow area in a real time mode and other data GPS World December 2009 www gpsworld com 44