- posted
18 years ago

based only on magnetometer data (and location on earth). I was hoping

to make some statements in hopes that some of the gurus in this area

might be able to verify (or correct) these statements.

(note: a single vector includes both positive and negative directions)

If you have a single axis magnetometer parallel to the lengthwise axis

(z-axis) of the rocket, with or without a spin rate, you have a cone

of possible orientation vectors based on the magnetometer data.

With a 2-axis magnetometer (x and z axis), you can equate the possible

attitude vectors of a non-spinning rocket down to a function of x-axis

sensor orientation vectors (which is still an infinite number and

pretty much useless in itself). If the rocket is spinning, you can

reduce the possible attitude orientation vectors down to 4 based on

the magnitude of the deviation during a revolution of the x-axis

magnetometer data ... ?

Lastly, with a 3-axis magnetometer rocket, you could determine the

exact attitude vector of the rocket regardless of spin...?

Any verification, corrections, or suggestions to my understanding is

greatly appreciated.

Thanks!

Dave