[FOSS-GPS] Post Processing with RTKLIB

[DavidKelley at ITSware.net]

In this case you are planning to use low lost L1 only device with a ten
dollar patch antenna.  Search for Michele Bavaro to find practical use tips
on that chip and RTKLIB.  By now you probably know L1/L2 is to be preferred,
and that you need to be <15km (better yet <10km) from your base stations to
get fixes with this setup.  We have done RTK mobile <2cm work on vehicles
with the NV08 and RTKLIB, but we tend to use better antenna (see
https://www.use-snip.com/kb/knowledge-base/question-what-antenna-should-i-use/). 
You do not state your data rates, only "as often as possible" - to some
people that means 1Hz, to others much more (that chip does 20hz with the
normal increase in measurement noise floor). One presumes you have a
generally clear sky? No forest cover? Is this a drone, a ground vehicle or a
manpack or other? This directly effects the expectations of signal loss you
will have.  You will end up with lots of data, in the NV08 propriety format,
that you will then translate to RTCM3 or to RINEX for use in post. And
RTKLIB does all that just fine. 

If you are processing "at the end of the day" then the slow internet should
not matter here (see prior reply about time tags, I do not think you will
need to use the tag option), but perhaps I do not understand your config. It
is likely you will want to record the RTCM streams from all the base
stations your device may be near and select which is best in post.  You have
not mentioned what the span of rover operation would be.  BTW, a point I
failed to note in my first post of that you need not send a precise / good
position to the NTRIP Caster and you only need to send it once.  For most
needs, a 1km will suit, so in fact the unaided fix from this device in
NMEA-183 format will be fine (or you can add it by hand). The Caster will
then pick the best station to send to you (and you will get the exact
location for that data). 



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