Hi there, I'm looking at Analog's MEMS solutions to potentially address a design requirement we have.
We would like to estimate the relative position of the tip of a stylus sized object to within 1mm. The IMU would be embedded in the body of the stylus and the software would double integrate the acceleration also use the gyro/magnetometer to extrapolate the tip position.
The stylus would be moved gently (held by hand) over an area of approximately 30cm x 30cm x 10cm and drift (of the extrapolated tip x,y,z position) should not exceed 5 mm over a 30 second period. The device can be re-calibrated/zeroed every 30s.
Does this sound feasible with current technology? If so, which IMU would you recommend?
I am sorry that we have not replied to this, but these objectives do not appear to be feasible, with any MEMS device that would fit into a stylus. If we assume a strap-down tracking approach, assume that the in-run bias stability (gyro and accel) are they only error sources, while using the ADIS16475-2, 1mm would appear to only be possible for 2-3 seconds. Sorry we can't be more helpful. Despite our delay in response, we do appreciate you posting this idea. Thank you!