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[DPRG] Further Quandaries on GPS
Subject: [DPRG] Further Quandaries on GPS
From: Dean Hall
dwhall256 at gmail.com
Date: Tue Jan 29 14:07:41 CST 2008
I read one paper that suggests any "jump" of 2 meters or more should
result in an increase of the variance used in the Kalman Filter.
However, I have seen my GPS module make jumps of 2 meters or more
that was actually an improvement in the position estimate. So, it's
hard to just say a "jump" by itself is either good or bad. You need
to look at other factors. That's why I've been trying to find
another way, like using inverse-number-of-satellites or HDOP as a
gross approximation of the position error.
!!Dean
On Jan 29, 2008, at 13:00 , John Abshier wrote:
> The discussions on filtering versus classification and use of a
> Kalman filter are interesting with respect to GPS errors. As
> mentioned above, GPS errors are correlated. But they often have
> large jumps when the satellites in use change. How should a filter
> handle the large jumps in position?
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