[teqc] using pre-2005Apr4 versions to extract L2C

Lou Estey lou at unavco.org
Tue Nov 15 14:23:31 MST 2005


All,

Capability for reading L2C code pseudorange from Trimble .dat and
RT17 formats was added to teqc on 2005 Apr 4. (L2C tracking can
be done, for example, with a Trimble NetRS receiver.)  If you try
to use a pre-2005Apr4 version of teqc to read these formats, then
any L2C code pseudorange will incorrectly show up as a "P2" observable
in RINEX.  (Currently, the only SV transmitting L2C is PRN 17.)

Having L2C pseudorange cast as P2 is wrong, but unavoidable if
using pre-2005Apr4 versions of teqc, given that the existance of L2C
in the Trimble formats relies on a combination of bit flags that
was essentially undefined and non-occurring prior to L2C tracking.

If you want L2C pseudorange cast as "C2" in RINEX, then you _must_
use a version of teqc of 2005Apr4 or later.  (Also remember that
until further notice you would also have to use the `+C2' option
on teqc to allow C2 reading.)

Hope this helps all you L2C users.

cheers,
--lou




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