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Looking for information about electronic compasses

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7rots51

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electronic compa/ss

Hello
I need info about electronic compa*ss sensors and design of such devices.

the accuracy is 0.2 or 0.1 degree.

Honeywell SSEC have such devices also.but I need more info.

Bye
 

sc/mp

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Hi

I've not full reference currently , but you could use google
to find materials about three main technologies used :

"flux gate compass" 1950 technology
"magneto resistive compass" Honeywell and Philips
"magneto inductive compass" pnicorp.com

Devantech compass uses KMZ51 from Philps with 0.1 deg resolution.

Philips has Design aid notes for KMZ51 :
http://www-us.semiconductors.philips.com/acrobat/applicationnotes/AN00022_COMPASS.pdf

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flatulent

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custom calibration

Once you get the magnetic sensors the usual way to make a compass is to have two sensors at right angles to each other. You take the arctan of the two readings. Since you want such high accuracy, you will probably have to include a calibration table to make corrections.

The other problem will be the effects of the magnetic field being not parallel to the surface of the earth. You may need to have a third magnetic sensor and do more complex math and use a more complex correction table.
 

7rots51

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hi

thanks for good replies.

I need some theory on compass and measuring formula.

another question: Is it possible to measure relative coordinate by a magnetoresistive 3 axis sensor?(set a point as a reference or origin)


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sc/mp

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The compass tells you "where you go" not "where you are" !

Use GPS to get coordinate.

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sc/mp

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I just find a good article with some "theory" about compass:

h**p://www.ssec.honeywell.com/magnetic/datasheets/sae.pdf

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7rots51

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Hi

If I want to use magnet*oresistive sen*sors like as ho*neywell sensors for "where you are",can I assign a point as refrence and measure the distance from it?or get the coordinate of other points relative to that reference point?

please answer to this .

bye
 

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