Message-Id: From: Frederick Blume To: igsmail@igscb.jpl.nasa.gov Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Subject: [IGSMAIL-5967]: Continuous L5 Data available at UNAVCO Date: Tue, 7 Jul 2009 12:59:09 -0600 Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 09 Jul 10:42:33 PDT 2009 Message Number 5967 ****************************************************************************** Author: Frederick Blume (UNAVCO) UNAVCO's Development and Testing Group is pleased to share continuous data from a Trimble NetR8 receiver tracking the demonstration L5 signal from SVN49/PRN01. Operated as a permanent station "L5DT", the receiver was installed on 25-March-2009 using a Trimble GNSS Choke Ring (TRM59800.00) mounted on the roof of our headquarters in Boulder, CO. However, L5 was not successfully tracked until 6-May-2009 when L5- compatible firmware was received from Trimble. The receiver is also tracking GLONASS and L2C signals where available. An IGS site log for the station is available at: ftp://data-out.unavco.org/pub/logs/l5dtlog.txt Data are available in daily directories (for day-of-year designated as DDD) at: ftp://data-out.unavco.org/private/9aBQ81/2009/DDD each directory contains a teqc QC file, compressed RINEX 2.11 and Hatanaka format observation files and both GPS and GLONASS navigation files. e.g. files for 6-July-2009 are available in the directory: ftp://data-out.unavco.org/private/9aBQ81/2009/187 which contains files: l5dt1870.09S l5dt1870.09d.Z l5dt1870.09g.Z l5dt1870.09n.Z l5dt1870.09o.Z New data directories are created daily at 1200 UTC for the previous day. Data are also mirrored in the CDDIS L5 test directory: ftp://cddis.gsfc.nasa.gov/gps/data/l5test/rinex2/daily/2009/ An important detail about the NetR8 receiver and its tracking of L2C on SVN49/PRN01: The receiver is hardware limited to track no more than 3 simultaneous pseudoranges from any satellite. This means that then L5 is present it will only track one code from each frequency: L1 C/A, L2C, and L5. For other block IIR-M SV's you'll see that L1 C/ A, P2, and L2C are tracked. I've noticed over time that there have been many instances for SVN49/ PRN01 that L2C has been turned off, in some cases for parts of days and in some cases for many days. In this case the NetR8 will track L1 C/A, P2, and L5. For example on day 186 (5-July), L2C was disabled on PRN01 after 1200 UTC: ftp://data-out.unavco.org/private/9aBQ81/2009/186/l5dt1860.09S I recommend inspecting QC files when using these data. Please let me know if you have any questions. Use of the data should be acknowledged according to our policy on the following page: http://www.unavco.org/community/policies_forms/acknowledgment.html Thanks, Freddy Blume ----------------------------------------------------------------------- Dr. Frederick Blume Sr. Project Manager UNAVCO 6350 Nautilus Dr. Boulder, CO 80301-5553 (303)381-7474 http://www.unavco.org -----------------------------------------------------------------------