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[DPRG] Tarzan's lessons learned at the DPRG Outdoor Challenge
Subject: [DPRG] Tarzan's lessons learned at the DPRG Outdoor Challenge
From: Robert F. Scheer
rfscheer at speakeasy.net
Date: Sat May 17 18:00:23 CDT 2008
On Sat, 2008-05-17 at 12:03 -0500, Randy M. Dumse wrote:
> Robert F. Scheer said: Wednesday, May 14, 2008 11:54 PM
> > Microstrain IMU/Compass - this $1500 sensor has been
> > surprisingly easy to use, given that it is far from simple
> > inside and is a serially interfaced device; it has required
> > almost no fuss except for the hassle of the tall mast.
>
> An idea occurs to me. Thinking the main magnetic influences were
> below you in rebar and what not. Imagine a compass on a variable
> hieght mast. Take readings down, middle and up. Do you suppose
> you could calculate the ultimate limit of the field with non
> interference from "plotting" the progressive changes with the
> compass higher and higher in the magnetic field?
>
> Randy
Haven't a clue. I've never seen 3-D maps of magnetic flux on the scale
of parking lots and robots near the earth's surface. It would be an
interesting science project.
I do have a comment though. Raising and lowering a mast is not a
practical way to equip an outdoor robot unless you don't care if it
stops to make the measurements, because it would be critical to make the
z measurements at the same x,y coordinate.
Perhaps more than one magnetometer placed at different heights could
give you simultaneous data that would be useful, but I've never heard of
anyone actually doing this and certainly haven't seen a study of it.
- Robert
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