[FOSS-GPS] What do "slip detected" and "large residual" mean?

[John Morris]

"Slip Detected" occurs when the GPS receiver temporarily loses track of a
satellite.  It isn't a full fledged loss of the satellite, but rather a
"glitch" in the phase/Doppler data.

 

"Large Residuals" mean the GPS equations didn't find a consistent solution.
It can happen for a number of reasons, including slips, errant data from the
receiver, or incorrect lat/lon of the base station.

 

Both errors are common if your receivers don't have a clear view of the sky.
Expect them when your rover is operating under or near trees, buildings,
etc.  Usually, post-processing software tries to identify measurements which
throw things askew, and then corrects the problem by dropping or correcting
those measurements. The process isn't perfect, and sometimes the errors
dominate.

 

 

 

From: foss-gps-bounces at lists.osgeo.org
[mailto:foss-gps-bounces at lists.osgeo.org] On Behalf Of Michele Bavaro
Sent: Thursday, August 09, 2012 5:32 AM
To: Open Source GPS-related discussion and support
Subject: Re: [FOSS-GPS] What do "slip detected" and "large residual" mean?

 

You may not be setting the position of the base station correctly?

Cheers,
Michele



On 08/08/2012 09:25, Yebin Lee wrote:

Hello, 

 

I've been using RTKLIB for several weeks and I faced several warning
messages which cannot understand while running RTKLIB.

Most warning messages are "slip detected" and "large residual".

Could any one comment me that what those messages indicate and how to solve
them?

Thanks.

 

Regards,

Yebin Lee






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