Abstract
For an accurate on-line measurement of ship's attitude, the authors previously developed a measurement system with one servo-type accelerometer and two servo-type inclinometers which were appropriately located on the ship. The system realized a higher accurate on-line measurement using an effective update algorithm for the candidates on system unknown parameters. The system, however, assumed an exact knowledge on the location of the rolling axis. This caused much degradation in the measurement accuracy in the case of unknown rolling axis. Such a case is, what is worse, usual practically.
This paper proposes a sensing system which estimates the ship's attitude despite no information on the location of the rolling axis.
