Rudder angle sensor

摘要

There is provided a rudder angle sensor with higher accuracy. The rudder angle sensor is a sensor attached to a steering shaft 105 for measuring an absolute angle of the steering shaft 105 and includes: a coarse signal measuring mechanism 45 and a fine signal measuring mechanism 15 which measure a rotation angle of the steering shaft 105 which rotates a predetermined number of times, the coarse signal measuring mechanism 45 outputting a coarse signal and the fine signal measuring mechanism 15 outputting a fine signal; and a calculating mechanism 39 which calculates the absolute angle of the steering shaft 105 based on coarse signal measurement data and fine signal measurement data converted from the coarse signal and the fine signal respectively, wherein the calculating mechanism 39 is constituted by including an abnormal data detecting and eliminating unit which detects and eliminates abnormal data deviating from a predetermined range from the measurement data. Accordingly, accuracy in detection of a rotation angle of a main drive gear (steering shaft) becomes higher. Thus, increase in accuracy of the rudder angle sensor is realized.