Gyro Sensor
The gyro sensor (located in the audio-navigation unit) detects the direction change (angular speed) and the attitude of the vehicle.
When the vehicle turns left or right, the gyro sensor outputs the voltage. But the sensor outputs the offset voltage at the static status. The audio-navigation unit calculates the relative bearing of the vehicle from the offset voltage. Since the vehicle may generate the yaw rate even in state of stopping (when the vehicle is spun on a turn table), the audio-navigation unit inhibits incorrect calculation using the gyro sensor temperature information.
When the vehicle accelerates and slows down, the gyro sensor outputs the voltage. In addition, the gyro sensor is affected by the vehicle angle. The audio-navigation unit calculates the angle of the vehicle from the offset voltage.
To properly calculate the angle of the vehicle, the audio-navigation unit sets up the offset in these cases:
- GPS altitude is constant.
- Vehicle speed is constant.