[teqc] qc of L5 for GPS and Galileo

Lou Estey lou at unavco.org
Wed Aug 13 09:46:12 MDT 2008


All,

GPS L5 is coming -- launch of GPS Block IIRM-7/IIR-20M with an
L5 demonstration signal (1176.45 MHz) is still scheduled for
later in 2008 and then multiple launches of GPS Block IIF with
L5 is still scheduled for 2009 in order to meet the ITU
deadline for the L5 allocation by 26 Aug 2009 -- and prototype
Galileo "L5" (E5a, also at 1176.45 MHz) has been transmitting
for a while now.  Septentrio asked me to update teqc to read
their new GNSS SBF messages with includes Galileo data, and they
kindly provided a 1-s sample tracking using their AsteRx2 receiver
of GPS and GIOVE-B which includes (RINEX 2.11-wise) GPS L1 and C1
and Galileo L1, L5, C1, and C5 (see table in 10.1.1 of
http://www.aiub.unibe.ch/download/rinex/rinex211.txt ).

This is still preliminary for teqc, but the general idea for a qc
modification that includes L5 observables is to have in the ASCII
time plot:

E31|ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss|E31

-- 's' meaning L1, C1, L5, and C5 observables were collected --

Moving average MP1      : 0.357422 m
Moving average MP2      : 0.000000 m
Moving average MP5      : 0.067547 m

(no mp1 or mp2 could be computed with the supplied data due since
there was no tracking on the L2-carrier)

       first epoch    last epoch    hrs   dt  #expt  #have   %   mp1   mp2   mp5 o/slps
SUM 08  8  5 18:00 08  8  5 18:15 .2506   1   8118      0   0  0.36  0.00  0.07      0

-- and with +ssv:

Individual SV Summaries:
      id #expt #have  #del   %   mp1   mp21   mp5  o/slp
SSV   2     0     0     0   0  0.00  0.00  0.00      0
SSV   5   902     0   902   0  0.00  0.00  0.00      0
SSV   6     0     0     0   0  0.00  0.00  0.00      0
SSV  10   902     0   902   0  0.00  0.00  0.00      0
SSV  12     0     0     0   0  0.00  0.00  0.00      0
SSV  16   902     0   902   0  0.00  0.00  0.00      0
SSV  21   902     0   902   0  0.00  0.00  0.00      0
SSV  23   902     0   902   0  0.00  0.00  0.00      0
SSV  24   902     0   902   0  0.00  0.00  0.00      0
SSV  29   902     0   902   0  0.00  0.00  0.00      0
SSV  30   902     0   902   0  0.00  0.00  0.00      0
SSV  31   902     0   902   0  0.00  0.00  0.00      0
SSV E31     0     0     0   0  0.36  0.00  0.07      0

-- assuming I did the mp1 and mp5 right on the GIOVE-B data.

Since this will obviously change things like the SUM (and new alternate
summary line, SWN) and the individual SV summary lines, this can't yet
be a default behaviour for teqc.  Just as with early L2C tracking where
I included a "+C2" option to kick that into gear in teqc, I'm considering
adding a "+L5" option to allow the above "mp5" additions and a few other
things in the qc related to L5 to be output.

Comments?  Questions?

--lou

p.s. I'm only around for another hour or so today, and then out of the
office until the latter part of next week, and then gone again until
Sept 2 or 3.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
Boulder, CO  80301-5554            e-mail:  lou  unavco.org
    WWW:  http://www.unavco.org   http://jules.unavco.org

"If the universe is the answer, what is the question?"
                                                -- Leon Lederman
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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