The authors have analyzed the measurement accuracy of the angle of inclination using kinematic GPS in order to measure pitch and roll of a small ship. These analyses are mostly of the standstill state, and there are few that practically analyze the measurement accuracy of the angle of inclination in pitching and rolling state, because it is unable to acquire the precise rolling value when a ship, means an antenna, rolls. Therefore, we made an equipment with the motor which inclines the arm installed an antenna periodically. And the angle of inclination was acquired by kinematic GPS using this equipment. However, as the angle of inclination of the equipment itself was illegible, an approximate value to the truth value was calculated from an angle of inclination acquired by GPS. An error of inclination when an antenna rolled was the reduction of the approximate value from the angle of inclination acquired by GPS. This technique enables to analyze more in detail the tendency of measurement error of an angle of inclination. As a result, when rolling became fast, the errors of the angle of inclination increased.
Kinematic GPS Ship motion
Measurement accuracy
Angle of inclination
Ship motion