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Subject: Re: Fluxgate compass /low end US vendor
From: Brian Whatcott (inet@XXX.XXX)
Date: Thu Jan 31 2002 - 20:51:27 EST
At 12:24 PM 1/31/02, Jared Sherman wrote:
> < Trouble is, you need a FAST
> response to the tilting of the deck >
>
>There are now solid-state accelerometers, literally you can buy a single
>IC chip off the shelf that is a solid-state accelerometer capable of
>generating data "instantly" for all three axes of motion. Among other
>things they are used to track for inertial navigation systems. I don't
>think they've replaced anything on the Polaris submarines, but they should
>be more than adequate for generating correction data on a fluxgate compass.
The low end of the market for a 3 axis magnetic sensor plus pitch and roll
detection is probably this board level OEM module from Precision Navigation
Inc.
The tcm2-50 at $770, still is not bargain priced - and the magnetic
sensors are not exactly flux gates, and the high dollar strap-down
rate-sensors and acceleration sensors are replaced by two "electrolytic"
inclinometers which read out pitch and roll to +/- 50 degrees, but this is
a step in the right direction, I'd think.
(I was tickled to see their custom TIMEX watch offering with compass readout.
Like the LCD-display compasses also shown on their site - these are low
cost consumer grade items.)
Brian Whatcott
Altus OK Eureka!
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