GPS L2C

current GPS constellation status: United States Naval Observatory (USNO)

2010: possible launch of GPS Block IIF-10

2009: possible launches of GPS Block IIF-2 — IIF-9

2009 Jan: possible launch of GPS Block IIF-1

2008 Sep 11: possible launch of GPS Block IIRM-8/IIR-21M

2008 Jun 30: possible launch of GPS Block IIRM-7/IIR-20M

2008 Mar 24: Navstar 62/GPS SVN48/PRN07 is set operational at 20:11 UTC. current orbit data; NANU 2008033

2008 Mar 15: GPS Block IIR-19M SVN48/PRN07 is launched from Cape Canaveral, Florida, USA — the sixth GPS SV with L2C capability. NASA SPACEWARN Bulletin; NANU 2008029

2008 Jan 2: Navstar 61/GPS SVN57/PRN29 is set operational at 20:41 UTC. current orbit data; NANU 2008001

2007 Dec 21: GPS Block IIR-18M SVN57/PRN29 (aka Navstar 61, USA 199) is launched from Cape Canaveral, Florida, USA — the fifth GPS SV with L2C capability. NASA SPACEWARN Bulletin; NANU 2007170

2007 Oct 31: Navstar 60/GPS SVN55/PRN15 is set operational at 22:46 UTC. current orbit data; NANU 2007146

2007 Oct 17: GPS Block IIR-17M SVN55/PRN15 (aka Navstar 60, USA 195) is launched from Cape Canaveral, Florida, USA — the fourth GPS SV with L2C capability. NASA SPACEWARN Bulletin; NANU 2007139

2006 Dec 12: Navstar 59/GPS SVN58/PRN12 is set operational at 03:07 UTC. current orbit data; NANU 2006161

2006 Nov 17: GPS Block IIR-16M SVN58/PRN12 (aka Navstar 59, USA 192, GPS 2RM F-3) is launched from Cape Canaveral, Florida, USA — the third GPS SV with L2C capability. NASA SPACEWARN Bulletin; NANU 2006147

2006 Oct 12: Navstar 58/GPS SVN52/PRN31 is set operational at 22:53 UTC. current orbit data; NANU 2006112

2006 Sep 25: GPS Block IIR-15M SVN52/PRN31 (aka Navstar 58, USA 190) is launched from Cape Canaveral, Florida, USA — the second GPS SV with L2C capability. NASA SPACEWARN Bulletin; NANU 2006097

2005 Dec 16: Navstar 57/GPS SVN53/PRN17 is set operational at 23:30 UTC, broadcasting L2C. current orbit data; NANU 2005154

2005 Oct 21: NASA L2C Tracking Demonstration — UNAVCO is supporting JPL in a NASA-funded L2C tracking demonstration, to explore the use of this new Civilian code signal (L2C), currently being broadcast by GPS SVN53/PRN17. The data is being collected with Trimble NetRS receivers L2C-enabled firmware. The sites are globally distributed: South Africa, Norway, Antarctica, Hawaii, and Alaska with international host organization cooperation; a locally accessible test site (UNAC) is located at the UNAVCO Facility in Boulder, Colorado. For this demonstration, JPL performs the data offloading/downloading and uses the Facility's teqc software for translation to the RINEX format. The L2C data from this demonstration is available from JPL and in compact RINEX format from CDDIS via anonymous ftp, with L2C data starting intermittently on day 2005:294 (21 Oct 2005). More at Facility NASA Support.

2005 Sep 26: GPS Block IIR-14M SVN53/PRN17 (aka Navstar 57, USA 183, GPS 2R-M1) is launched from Cape Canaveral, Florida, USA — the first GPS SV with L2C capability. NASA SPACEWARN Bulletin; NANU 2005123

GPS L5

2010: possible launch of GPS Block IIF-10

2009: possible launches of GPS Block IIF-2 — IIF-9.

2009 Jan: possible launch of GPS Block IIF-1, the first GPS SV with L5 capability.

GPS L1C

No scheduled launches of GPS Block III with L1C until at least 2013.

GLONASS

current GLONASS constellation status: Russian Space Agency's Information-Analytical Center (IAC)

2008 Oct: planned launch of trio of GLONASS satellites from Baikonur Cosmodrome, Kazakhstan.

2008 Jul: planned launch of trio of GLONASS satellites from Baikonur Cosmodrome, Kazakhstan.

2008 Feb 8: GLONASS 721 (Cosmos 2435) is set to operational; plane/slot 2/13, frequency channel -2; current orbit data.

2008 Jan 25: GLONASS 722 (Cosmos 2436) is set to operational; plane/slot 2/09, frequency channel -2; current orbit data.

2008 Jan 22: GLONASS 723 (Cosmos 2437) is set to operational; plane/slot 2/11, frequency channel 0; current orbit data.

2007 Dec 25: Three GLONASS-M satellites — Cosmos 2435/GLONASS 721, Cosmos 2436/GLONASS 722, Cosmos 2437/GLONASS 723 — are launched from Baikonur Cosmodrome, Kazakhstan. All will be in GLONASS orbit plane 2. NASA SPACEWARN Bulletin

2007 Dec 4: GLONASS 718 (Cosmos 2431) is set to operational; plane/slot 3/17, frequency channel -1; current orbit data.

2007 Nov 27: GLONASS 719 (Cosmos 2432) is set to operational; plane/slot 3/20, frequency channel 2; current orbit data.

2007 Nov 25: GLONASS 720 (Cosmos 2433) is set to operational; plane/slot 3/19, frequency channel 3; current orbit data.

2007 Oct 26: Three GLONASS-M satellites — Cosmos 2431/GLONASS 718, Cosmos 2432/GLONASS 719, Cosmos 2433/GLONASS 720 — are launched from Baikonur Cosmodrome, Kazakhstan. All will be in GLONASS orbit plane 3. NASA SPACEWARN Bulletin; first Glonass launch of 2007

2007 Oct 12: GLONASS 716 (Cosmos 2425) is set to operational; plane/slot 2/15, frequency channel 0; current orbit data.

2007 Apr 3: GLONASS 715 (Cosmos 2424; plane/slot 2/14, frequency channel 4; current orbit data) and GLONASS 717 (Cosmos 2426; plane/slot 2/10, frequency channel 4; current orbit data) are set to operational.

2006 Dec 25: Three GLONASS-M satellites — Cosmos 2424/GLONASS 715, Cosmos 2425/GLONASS 716, Cosmos 2426/GLONASS 717 — are launched from Baikonur Cosmodrome, Kazakhstan. All will be in GLONASS orbit plane 2, beginning its population. NASA SPACEWARN Bulletin

2006 Aug 31: GLONASS 713 (Cosmos 2418; plane/slot 3/24, frequency channel 2; current orbit data) and GLONASS 714 (Cosmos 2419; plane/slot 3/23, frequency channel 3; current orbit data) are set to operational.

2006 Jan 22: GLONASS 798 (Cosmos 2417) is set to operational; current orbit data

2005 Dec 25: Three GLONASS satellites — Cosmos 2417/GLONASS 798, Cosmos 2418/GLONASS 713, and Cosmos 2419/GLONASS 714 — are launched from Baikonur Cosmodrome, Kazakhstan, one being an older block with a three-year operational life and the other two being the newer GLONASS-M satellites having a predicted service life of seven years. All will be in GLONASS orbit plane 3, thus completing the population of GLONASS orbital planes 1 and 3. When operational these will bring the total of operational GLONASS SVs in orbit to 16, and Russia hopes to bring the constellation up to at least 18 operational SVs by 2007. IGSMail-5274; NASA SPACEWARN Bulletin

Galileo

2008 Apr 27: The second Galileo In-Orbit Validation Element, GIOVE-B, is successfully launched from Baikonur Cosmodrome, Kazakhstan. BBC News report

2006 Jan 12: The first Galileo navigation signals are broadcast from the first Galileo In-Orbit Validation Element, GIOVE-A, following a successfully completed platform commissioning phase on 9 January. ESA report; current orbit data

2005 Dec 28: The first Galileo In-Orbit Validation Element, GIOVE-A, is successfully launched from Baikonur Cosmodrome, Kazakhstan. BBC News report; NASA SPACEWARN Bulletin

SBAS

2006 Feb 18: The Japanese SBAS component MTSAT-2 (which will likely be renamed Himawari-7) is successfully launched from Tanegashima Space Center, Japan. Spaceflightnow.com report; current orbit data; NASA SPACEWARN Bulletin

2005 Feb 26: The Japanese SBAS component MTSAT-1R (Himawari-6) is successfully launched from Tanegashima Space Center, Japan. This replaces MTSAT-1 which was lost in an failed launch on 15 Nov 1999. Space.com report; current orbit data; NASA SPACEWARN Bulletin

Receivers and Antennae

2007 Jul 17: Leica GMX902 GG — Leica Geosystems announces a GNSS version of their GMX902 receiver with up to 20-Hz sampling of dual-frequency GPS + GLONASS (up to 26 SVs: 14 L1 + 14 L2 GPS, 12 L1 + 12 L2 GLONASS). With a nominal 12 VDC input (10.5 to 28 VDC) and an operational low-power consumption of 2.0 W (0.007 W in sleep mode), the GMX902 GG is perfect for deformation monitoring, atmospheric studies and ionospheric scintillation research. The recommended antenna is the Leica AX1202 GG or AT504 GG.

2006 Sep 20: Leica AT504 GG — Leica Geosystems announces a GNSS version of the AT504 choke ring antenna for permanent reference stations and networks. The AT504 GG receives L1/L2 GPS and GLONASS signals and features a Dorne-Margolin antenna element and NASA/JPL design. Conventional Leica AT504 choke ring antennas can be upgraded to the new AT504 GG version.

2006 May 12: Leica GRX1200 GG Pro — Leica Geosystems releases the GRX1200 GG Pro, a GPS/GLONASS receiver for installation in permanent GNSS sites. In addition to L1/L2 GPS and GLONASS, it can also track GPS L2C. Additionally, this Internet-enabled receiver is designed to track future signals, such as GPS L5 and Galileo. Leica has informed the UNAVCO Facility that all their L2C-capable receivers track an L2C combined code, i.e. CM + CL where CM is the L2C moderate code and CL is the L2C long code, when the receiver is set for L2C tracking and when the L2C signal is available. For all other GPS satellites, the receivers track the L2 P(Y) code.

2006 Jan 6: Trimble NetRS — Trimble has informed the UNAVCO Facility that the NetRS tracks the GPS L2C combined code, i.e. CM + CL where CM is the L2C moderate code and CL is the L2C long code. Due to limitations with Trimble firmware, only one code psuedorange per carrier frequency can be stored. Thus when tracking GPS SVs broadcasting L2C with the NetRS, only the L2C(CM+CL) code pseudorange is reported for those SVs (currently only GPS PRN17), and the receiver continues to track the semi-codeless P2 for the other SVs (with antispoofing on).

2003 Sep 10: Septentrio PolaRx2C — Septentrio releases the PolaRx2C L2C, a GPS/SBAS receiver with GPS L2C tracking. The design supports very low tracking noise, active multi-path mitigation, using both L2C CM (moderate code) and CL (long code). The PolaRx2C can generate and record observables from both the coarse and precise codes for both the L1 and L2 carrier frequencies, thus allowing the user to obtain code pseudoranges for L1 C/A, L1 P(Y), L2C, and L2 P(Y) at the same epoch for GPS SVs broadcasting L2C. (more)

Translation and Format Issues

2007 Dec 5 & 20 UNAVCO's teqc software is modified to read new Topcon TPS/Javad JPS messages for GPS L2C data.

2007 May 23 & June 7 UNAVCO's teqc software is modified to read Septentrio Binary Format (SBF), including GPS L2C and SBAS data.

2007 Feb 26 & Mar 1 UNAVCO's teqc software is modified to read and write RINEX 2.11 observation and met files.

2006 May 19 & June 27 UNAVCO's teqc software is modified to read GLONASS data in Leica system 1200 "GG" MDB and LB2 formats.

2006 Feb 1: RINEX 3.00 specification is released, which allows for full description of observables in GNSS modernization for GPS, GLONASS, Galileo, and SBAS using 3-character codes.

2006 Jan 6: RINEX 2.11 specification is released. This serves as a stopgap exchange format some observables in GNSS modernization before RINEX 3.00 becomes widely accepted and used because 2.11 is very similar to 2.10 and just introduces the Galileo system and a few more observables represented with 2-character codes.

2005 Nov 14: UNAVCO's teqc software is modified to read RINEX 2.11 with GPS observable "C2" and perform a data quality check on the the L2C data.

2005 Jul 27: UNAVCO's teqc software is modified to write out RINEX with GPS C2 as RINEX version 2.11. Because the L2C code pseudorange is defined only at RINEX 2.11 (as GPS observable "C2") and RINEX 2.11 is not yet accepted by default at IGS data and analysis centers, users must include the +C2 option on teqc in order to read or write RINEX 2.11 with the C2 observable.

2005 Apr 4: UNAVCO's teqc software is modified to extract L2C data from Trimble .dat and RT17 formats and is tested using synthetic data from Trimble.

2004 Mar 1-5: A draft for a new RINEX specification allowing for a full set of GNSS observables is informally presented at the IGS 2004 Workshop and Symposium at Berne, Switzerland by Werner Gurtner (AIUB), following prior discussion with Lou Estey (UNAVCO).

GPS Modernisation. GPS future trends. GNSS Modernisation. GNSS future trends. GNSS developments.

Comments or questions about this page? Send e-mail to Lou Estey (louunavco.org).

Last modified Monday, 23-Jun-2008 10:49:08 MDT

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