[FOSS-GPS] RTKLIB errors and warnings

Josh Leighton leighton.josh at gmail.com
Thu Feb 6 11:18:07 PST 2014

a) Those look like fairly standard patch antennas, so I wouldn't be
surprised if you are unable to achieve a consistent fix.

b) The longer the better.  The accuracy of a proper fix can be on the order
of cm's, so the accuracy of your base station should probably be at least
that good.

c) If you're seeing an intermittent fix with low AR ratio, I believe it's
possibly an incorrect fix.

d) If you don't have a good fix, I suspect changing the base station values
by a small amount won't do much.  I'm not sure how important the accuracy
of your base's altitude is, nor do I know what the expected accuracy of a
good fix's altitude is.  Perhaps others here know more.

On Wed, Feb 5, 2014 at 11:45 PM, mazahirp <mazahir.poonawalla at gmail.com>wrote:

> Hi Josh,
> Thank you for the reply. So basically I need longer distance between the
> base and rover.
> I am using - ABRACON APAE1575R2540AADBE-T & ABRACON APAE1575R2540BBDB1-T as
> my 2 antennas.
> So, few more doubts:
> a). Will these antennas do as far as RTK GPS is concerned?
> b). Will I have to take base readings for so long? Assuming, though base
> would be at a constant location, but base position could change on a day to
> day basis. Also, if I log (lat,long and altitude) these values, the data
> will be very large to average out. Should i use MATLAB for averaging?
> c). I was getting a "fix" status at certain intervals in static and
> kinematic mode, but the baseline in the graph was always beyond 5 to 6
> meters (in both fix and float status).
> d). If I change the base values in options by a very minimal margin and
> change its altitude by 10m, still there is no change in the output rover
> position. The baseline still shows beyond 6m. Also the height/altitude is
> wrong (when I compare it with a ublox 5t running in u-center placed at same
> location).
> Would be really helpful. Thank you once again.
> Cheers,
> Max
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