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Model Forum / General / Rockets / October 2005



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Digital Compass Module with Dead Reckoning Technology

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NormanHeyen - 27 Oct 2005 00:28 GMT
OK all you electronic gadget makers out there, this has to be of some
use in a rocket...

http://www.emediawire.com/releases/2005/10/emw301223.htm

From the press release:
Distinct features of this new compass module product include:
•    Azimuth angle, true or magnetic
•    Pitch and roll (tilt) angle
•    1 degree accuracy
•    Built-in magnetic compensation functions and
•    Small footprint, low power, light weight.

I no longer have any affiliation with Honeywell, but the specs look
like this would be a cool thing to have. No idea if the price is
within reason or not.

Norman
Robert Galejs - 27 Oct 2005 14:51 GMT
The pitch and roll angles, as well as absolute azimuth angle are
all dependent on the unit not accelerating with respect to the
earth.  As soon as this unit is launched in a rocket the only
angle you can unambiguously measure is the angle off of the
local magnetic field.  This has its uses but, can be accomplished
with a much simpler sensor....

http://www.cmass.org/member/Robert.Galejs/Magnet3.PDF

The multi-axis accelerometer and magnetometer can give interesting
data, but are incapable of absolute angle measurement in a flying
rocket.

- Robert Galejs

> OK all you electronic gadget makers out there, this has to be of some
> use in a rocket...
[quoted text clipped - 14 lines]
>
> Norman
NormanHeyen - 27 Oct 2005 19:54 GMT
>The pitch and roll angles, as well as absolute azimuth angle are
>all dependent on the unit not accelerating with respect to the
[quoted text clipped - 8 lines]
>data, but are incapable of absolute angle measurement in a flying
>rocket.

I've seen what you've done in the past and was hoping there would be
something to this. Oh well, it was an interesting thought. I wonder if
this needs to be tied to a reference, like a gyro? And what the
purpose of it is if so.  I think laser ring gyros are still pricey...

Norman
 
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