Hi - I'm working on building a fairly sophisticated IMU system. It will combine data coming from 3 axes of gyro, 3 axes of accelerometer,3 axes of magnetometer, and a DGPS corrected GPS into an XYZ offset and roll pitch yaw offset from initial conditions.
Anyways - right now I'm trying to identify what sort of magnetometer to use. I care most about accuracy, precision, and bandwidth. Right now I'm thinking I'll use some Honeywell parts:
Good linearity (.1%), high bandwidth (5MHz), small size (LCC-16 (essentially a QFN without a ground pad)), annoying interface (lots of external parts needed - including high voltage stuff - a complete pain to work with).
One thing I worry about a bit - Honeywell also has some parts with 3x the sensitivity of the HMC1053, but in unappealing packages (and only single or dual axes). Will I lose any accuracy by having to set my gain 3x as high on whatever instrumentation amp. I use? From my understanding typically the non-linearity of instrumentation amps is in the hundreths or thousandths of a percent, so it won't matter at all.
PNI make some sensors that seem to be more bandwidth limited. Various other companies make magnetometers with somewhat slow digital interfaces, whereas I'm looking for an analog interface. I would like about 1KHz bandwidth or more.
Any other parts I should be looking at?