Patent ID: 8250901

Claim:
A system comprising: a rotary device; a pair of rotary absolute position (RAP) sensors positioned with respect to the rotary device, and operable for generating respective encoded pairs of voltage signals describing positional data of the rotary device; and a host machine in communication with the pair of RAP sensors, wherein the host machine is configured to derive calibration parameters and to determine an absolute position of the rotary device using the derived calibration parameters by: recording a plurality of the encoded pairs of voltage signals from the RAP sensors, wherein the recorded plurality of the encoded pairs of voltage signals forms an ellipse; using an ellipse-of-best fit to map the ellipse of the recorded plurality of the encoded pairs of voltage signals to sine/cosine pairs; deriving the calibration parameters from the ellipse-of-best-fit, wherein the calibration parameters map each of the sine/cosine pairs to a respective one of the encoded pairs of voltage signals; and determining the absolute position of the rotary device using the derived calibration parameters.