[FOSS-GPS] RTKLIB errors and warnings

[Josh Leighton]

Hi Max,

It sounds like you're on the right track.  The first error you're seeing
("initial base station position error") is simply indicating that you
haven't provided the base station position in the options menu, which you
correctly did after that.  Of course you'll want your base station position
to be as accurate as possible.  Collecting 24+ hours of data from the base
station and taking an average is a good start.  You can also use the
"static" positioning mode in RTKNAVI to indicate that your receiver is
stationary.

A "float" status means just what the warning says, that it is unable to fix
the integer ambiguity and achieve a "fix" status (you can look at some of
the rtklib references for more on what this means).  Two things I would
suggest immediately:

1) - a one meter baseline is very short.  It will probably work better if
your rover and base station are farther apart.  In my experience, at least
10 meters of separation is needed to get a consistent fix.

2) - What type of antennas are you using with your receivers?  The
standard, inexpensive patch antennas probably won't be good enough to
achieve a fix.  I've had success with the ublox receivers using GPS-701-GG
antennas from Novatel at both the base station and rover.

Good luck with your setup.

-Josh


On Wed, Feb 5, 2014 at 12:46 AM, mazahirp <mazahir.poonawalla at gmail.com>wrote:

> Hi All,
> I am new to RTK GPS and RTKLIB. I am trying to understand and still work
> around with it. Please help me with the following errors:
>
> To start understanding, I place 2 gps receives U-BLOX 6T at a distance of 1
> meter (1 as rover and 1 as base). Now I use RTKNAVI to input serial UBX
> data
> and I select kinematic as the option. However, it displays position in
> single mode and in the error/warning section, I get the following error:
>
> "initial base station position error" What is this and how to solve?
>
> Then, the I apply values of lat/long and height which I receive in single
> mode to Options->Positions->Base station. Now it starts working in
> kinematic
> mode but the result is always "float" and the baseline is never coming to a
> constant value. Also in the error/warning section, along with other
> warnings, I get:
>
> "Invalid integer ambiguity resolution" warning. What is this?
>
> Can anyone please explain as to what these mean and how to solve it? Also,
> do I need to put in base station values as I did? Was it the right method?
>
> Thank you the help.
>
> Cheers,
> Max
>
>
>
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