Well, hummm..
Post the two files if you can for others to tinker with. Recall that
RTCM 1004 will not carry the Doppler that you might have originally had
(so it may not be present in your RINEX files if that is what was
converted), so you might be better of post processing with raw data (or
MSM type RTCM if you get it). Doppler is very useful here, esp with L1
only. I have not used the baseline constraint in RTKLIB, so can not
comment on its use or value here, would have to dig into the actual
code. In any event, with the moving baseline method expect to see
noticeable loses the positional estimate reported, in favor of a better
estimate or the yaw and pitch. [you can see that with the two reference
stations I pointed you to, in static you will see <5mm variation] This
method is at its best for a ship or plane. If your antenna are set are
too close ( say~<50 cm), or they interfere with each other (due to the
down convert local oscillator crosstalk between identical GNSS devices),
other issues will of course arise. Just some quick guesses.
Good luck, regards DCKelley
On 4/2/2016 5:02 PM, Marco Mendonça wrote:
Thanks, David!
I'm actually trying to post process two RINEX files on rtkpost from
antennas on a car. I chose the moving baseline option, set the
baseline length, but still, no solution.
When not setting the baseline length as fixed, it works fine. Although
the estimated baseline is close to the real value, I'd like it to be
fixed.
I'm also using moving baseline. With the length constraint, the
results are noisy and only with 1.07% fixed epochs. Without the
constraint, the fixed epochs are around 90% and much smoother and
coherent. And I'm absolutely sure about the distance from antenna to
antenna.
Also, thanks for the example provided! I'll connect there and try to
debug my option choices. Any other guesses of what might be happening
are greatly appreciated!
Regards,
Marco
Date: Sat, 2 Apr 2016 15:09:23 -0700
From: David Kelley <davidkel...@itsware.net>
To: Open Source GPS-related discussion and support
<foss-gps@lists.osgeo.org
<mailto:foss-gps@lists.osgeo.org>>, mammendo...@gmail.com
<mailto:mammendo...@gmail.com>Subject: Re: [FOSS-GPS] RTKLib fixed
baseline length
Message-ID: <57004313.4050...@itsware.net>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Marco :
Works fine for me as well.
There are no "special" switches, does it first work for you when
stationary? Start with getting that to work as a first step.
If you have it working in the mode "Kinematic" (ie normal moving rover
RTK) or "Static" (ie stationary RTK where measurement noise is
taken out
in dithering the clock estimate more than the position), then
"Moving-Base" should work as well. I presume you know the reason for
using this mode is often to get a precise estimate of the rovers
heading.
Here is an image of it working in that mode on short 130cm baseline.
You can see that the two antenna are nearly, not not 100% located N-S
with respect to each other. The ~0.1 degree shift is because the West
side of office building does not run a true north-south! Feel
free to
connect to the SNIP NTRIP casters that are listed on the image
below to
confirm everything else is working. [No user id is needed, and
Serv2.itsware.net:2101 <http://serv2.itsware.net:2101/> is left up
during the weekend. Not guarantees
during the US work week as that is used a testing machine.]
Good luck!
Regards, DC Kelley
- Marco Mendonça
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Regards,
David Kelley
ITS Programs Manager, SubCarrier Systems Corp. (SCSC)
626-485-7528 (Cell) 626-513-7715 (Office) 888-950-8747 (Main)
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