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'Interesting Project'
1999\07\04@040909 by Tim Hamel

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Here's something someone (maybe a beginner?) might enjoy looking over. It's a
bit hefty for a beginner, but the source code is well commented and it's
color coded!

The Yoda Project:
It's a talking Yoda head complete with ADC, Servos, and an ISD1000A:

Tim H.

'interesting project'
2009\04\28@094409 by Derward Myrick
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>From another list,  some might find it fun to look azt.


----- Original Message -----
From: "Tyler Harpster" <>
To: <>
Sent: Monday, April 27, 2009 10:23 PM
Subject: [Mw] microwave pointing device ideas

{Quote hidden}

2009\04\28@114225 by M. Adam Davis

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Lots of projects out there that have information on how to do this,
and the expected accuracy.  Look up Kalman filters and IMU (inertial
measurement units).

Perhaps start with this:

They have an IMU section:

Might also look up ardupilot, and the many forums for electronics,
navigation, RC vehicles, etc.


On Tue, Apr 28, 2009 at 9:41 AM, Derward Myrick <> wrote:
> >From another list,  some might find it fun to look azt.
> Derward
> {Original Message removed}

2009\04\28@180601 by Sean Breheny

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How well this will work depends a lot on the application. There are no
gyros out there which will allow you to "set" the orientation and then
have it be accurate for an indefinite amount of time thereafter. You
will need some way to re-set the gyro periodically. A good GPS
receiver should be able to get heading info from even fairly slight
motion - you don't need to drive it down a road.

Another possibility would be to use radio direction finding to find
the bearing to several known radio transmitters (such as FM radio
stations - could even use time-difference of arrival for this) or
aviation navigation beacons.

Would this device be used to determine bearing angle in one location
or would it have to be able to do so anywhere on earth?


On Tue, Apr 28, 2009 at 11:42 AM, M. Adam Davis <> wrote:
{Quote hidden}

>> {Original Message removed}

2009\04\28@193745 by Carl Denk

Typically a moving type GPS (not a land surveyors or other using DGPS
local station, or averaging over a period of time)  will be +/- 30 feet
or so. Lets take an extreme, 60 foot error between readings, along with
1000 foot of travel, then arc tangent of 60/1000 = 3.4 degrees. But the
unit will be taking many readings in a minute. WAAS (or the Russian
equivalent) will be a little better. Some units may average the track
direction. I have used the unit to find cemetery grave markers, after
previously setting a waypoint to the marker with good success, in
particular when after vising several times, each time adjusting the
waypoint  location by averaging the old and new locations. I use the map
then to determine what direction to walk.  Sorry to say I haven't paid
attention to the track direction indicated, or whether WAAS was active.

I have a Lowrance Expedition C hand held. For short distances of travel,
say maneuvering in a small parking lot or small street intersection,
trying to figure out the direction of travel, or where you want to go is
not dependable. The unit does have a built in compass which works fine
when  a passenger of the foot (walking), but inside a vehicle, is
useless, with errors of 90 degrees or more, even after compensating in
the vehicle.

Sean Breheny wrote:
> A good GPS
> receiver should be able to get heading info from even fairly slight
> motion - you don't need to drive it down a road.

2009\04\29@003708 by Sean Breheny

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Hmmm, I was just going by experience with a Garmin consumer grade
hiking GPS about 5 years ago. You could literally hold it in your
hand, walk a few steps, and it would give you a reasonably accurate
heading (say, within 20 deg, although I didn't rigorously test it)

A GPS fix has several types of error (this is a rather generic analysis):

1) zero-mean noise on the time-scale of seconds
2) zero-mean noise on the time-scale of minutes/hours
3) a constant (over an hour, say) mean error which depends upon your
position, which satellites you see, etc.

A single position fix has all three sources of error. Averaging over
seconds reduces #1, averaging over hours reduces #2, DGPS partially
allows you to eliminate #3.

A velocity estimate isn't affected by #3 at all. Some sensible
averaging and assumptions about how you can move can be built into the
GPS's filtering algorithm so that #1 and #2 are reduced. This leads me
to believe that a velocity estimate has the potential to be quite


On Tue, Apr 28, 2009 at 7:37 PM, Carl Denk <> wrote:
{Quote hidden}


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