An Absolute Displacement Measurement Method and Its Application in Ship Motion Measurement

Due to the fact that there is no static reference point in ocean space, relative measurement sensors such as laser cannot be applied of ship motion. In order collect motion signal a more accurately, an absolute method for proposed. Firstly, acceleration heave direction obtained by using sensor; secondly, time–frequency domain integration algorithm used avoid problem quadratic trend item and influence low-frequency signal, ship’s displacement value integration; finally, measured sensor integrated are compared with each other verify effectiveness based on sensor. At same time, angle measure roll pitch ship, form system points arranged which proves can data from sea areas far coast. Motion signals advantageous.