I'm not sure what the best approach is to measure the angle of floating platform. It is flat most of the time but it might see some wave action. The roll period of the platform is around 4-5 seconds. I will new trinity to measure only the inclination angle and filter the change due to the wave action.
Have no idea what your talking about. You need to provide a photo or drawing and explain why this thing is rolling.
This isn't anything we should be expected to be familiar with. Start at the beginning and explain what your talking about.
We're geeks, not salty dogs...