| US 7,565,260 B2 | ||
| Apparatus and method for setting a gyroscope zero point | ||
| Doo-Hee Yun, Yongin-si (Korea, Republic of); and Young-Khon Moon, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd, (Korea, Republic of) | ||
| Filed on Oct. 12, 2005, as Appl. No. 11/249,072. | ||
| Claims priority of application No. 10-2004-0081418 (KR), filed on Oct. 12, 2004. | ||
| Prior Publication US 2007/0136019 A1, Jun. 14, 2007 | ||
| Int. Cl. G01L 9/00 (2006.01) | ||
| U.S. Cl. 702—151 | 5 Claims |
| 1. An apparatus for setting a gyroscope zero point reference value, comprising:
a gyroscope for outputting a signal indicating angular velocity in the form of a voltage;
a global positioning system (GPS) receiver for receiving a GPS signal;
an analog-to-digital (A/D) converter for digitizing the voltage output from the gyroscope; and
a controller for detecting a speed and a direction angle of a vehicle from the received GPS signal, determining if the vehicle
is traveling in a straight line, and filtering the voltage output from the gyroscope to obtain a gyroscope zero point reference
value if the vehicle is traveling in the straight line,
wherein the gyroscope zero point reference value is computed by ZPT_Ref=(N−1)/N*ZPT_Ref+1/N*Mean(Y[0 . . . 9]), where ZPT_Ref denotes a gyroscope zero point reference value, N denotes a smoothing filter constant, and Mean(Y[0 . . . 9]) denotes a mean value of Y[0] to Y[9] values, each of the Y[0] to Y[9] values being an average of an accumulated value obtained by accumulating a mean value of gyroscope output values measured
in a predetermined cycle a predetermined number of times.
|