Dear Timo
Thank you for testing RTKLIB 2.4.0.
It really seems that a huge number of points stay inside a radius of
just 2.5 centimeters. Can this really be true?
Check Q (Quality Indicator) values in the solutions.
Fixed (Q=1, integer ambiguity resolved) solutions
usually have the accuracy of 1 cm as horizontal STD
and 2 cm as vertical STD with a short baseline
(<10 km).
Tomoji TAKASU
--------------------------------------------------
From: "Timo Juhani Lindfors" <[email protected]>
Sent: Friday, August 13, 2010 6:04 AM
To: "Open Source GPS-related discussion and support"
<[email protected]>
Subject: Re: [FOSS-GPS] rtklib: simple DGPS post-processing
experiment,improvements with rtklib 2.4.0
Hello Tomoji,
I upgraded my internal Debian package of rtklib to version 2.4.0 and
reran all the commands I mentioned in my earlier email. Here's a
summary of changes in output I got:
Timo Juhani Lindfors <[email protected]> writes:
Single mode (-p 0)
==================
http://iki.fi/lindi/gps/experiment/2/p0-neo1-scatter.png
http://iki.fi/lindi/gps/experiment/2/p0-neo2-scatter.png
http://iki.fi/lindi/gps/experiment/2/p0-neo1-scatter-2.4.0.png
http://iki.fi/lindi/gps/experiment/2/p0-neo2-scatter-2.4.0.png
=> no changes
DGPS mode (-p 1)
================
http://iki.fi/lindi/gps/experiment/2/p1-neo1-scatter.png
http://iki.fi/lindi/gps/experiment/2/p1-neo1-scatter-2.4.0.png
=> no changes
Kinematic mode (-p 2)
=====================
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter.png
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter-2.4.0.png
=> remarkable improvement! Scatter with radius of 0.00005 degrees is
now gone and most of the points are very tighly packed in the middle
with some slow random walk.
Here's the same scatter in UTM coordinate system so that the units are
meters in various zoom levels:
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter-utm5-2.4.0.png
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter-utm1-2.4.0.png
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter-utm0.30-2.4.0.png
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter-utm0.10-2.4.0.png
http://iki.fi/lindi/gps/experiment/2/p2-neo1-scatter-utm0.03-2.4.0.png
It really seems that a huge number of points stay inside a radius of
just 2.5 centimeters. Can this really be true?
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