[FOSS-GPS] Post Processing with RTKLIB

[DavidKelley at ITSware.net]

Post processing raw observation data gathered in the field has been very
common decades and you should have no problems using RTKLIB (the RTKPOST
tool) for that.  Many "old timers" still do it that way for various reasons
and when we are in the filed we are checking as we go but we old "trust" the
post processed results.  And post processioning means you can also use final
orbits and other data products that are readily available to get better
results.  All of this is moot if your field data is itself corrupted.  And
you can easily turn RTCM3.x into RINEX files with other RTKLIB tools and
find 3rd party processing services to solve it for you.

Time synchronization will not in fact be an issue.  RTCM 3.x provides the
precise time over the current GPS week, so you have to tell the tool (RTKLIB
or any other such tool) what week a file came from but the file name
conventions used often help with that.  There are a few other messages and
tricks, but this solves 99% of your issues.  The navigation filter will then
determine the precise time.  

The data from the "nearest RTK" station of course depends on where you are. 
Many tools (RTKLIB, SNIP, and often the NTRIP Caster device itself) will
provide a means to capture the raw RTCM data for your post processing needs. 
NGS CORS even runs a long term FTP site with such data, but the data is
decimated.  Depending on your application that may not be an issue.  

*So yes this is quite possible and routinely done*. But you have not told
the group anything more about the devices in the field (the rovers) and what
span of location and how often the positional estimates are wanted, what
precision is required, etc. Many of the practical details and useful advice
you might get will turn on that.    Regards, DCK



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