Haechitech Corporation

Kyoung Suck Ki

Young Joon Kim

Dong Yoon Kim

Yeon Soo Choi

Byung Ki Kim

Hae Jung Lee

Hyung Sik Shin

Jo An Na

Seung Hwan Park

An apparatus for detecting an angle of rotation includes a rotatable member situated in a first plane and rotatable to be switched between a reference state and rotated states, the rotatable member being unrotated in the reference state, magnet pieces arranged on the rotatable member along a circumferential direction of the rotatable member at intervals of an angle, the magnet pieces moving along a first locus as the rotatable member is rotated, a Hall sensor lying in a second plane spaced a distance apart from the first plane and positioned along a second locus, said second locus being a projection of the first locus into the second plane, and the Hall sensor providing an output varying as the rotatable member is rotated, and a processor configured to detect an angle of rotation of the rotatable member in response to the output from the Hall sensor.

Apparatus for detecting an angle of rotation

A method of correcting an output value of a geomagnetic sensor that recursively calculates a state estimate, an estimate gain vector, and an estimate error co-variance based on the output value of the geomagnetic sensor that is acquired sequentially and corrects the output value of the geomagnetic sensor based on the value includes acquiring a koutput value of the geomagnetic sensor, calculating a kestimate gain vector based on a k&#x2212;1estimate error co-variance and the koutput value, calculating a kstate estimate based on the calculated kestimate gain vector and the koutput value and a k&#x2212;1state estimate, calculating the kestimate error co-variance using the kestimate gain vector and a k&#x2212;1estimate error co-variance, and correcting the output value of the geomagnetic sensor based on the kstate estimate, wherein k is a natural number larger than 1.

Method and apparatus of correcting output value of geomagnetic sensor

Growing community of inventors

Cheongju-si, South Korea

Kyoung Suck Ki