How to calculate pitch angle and roll angle

Hello everyone,
I am conducting a ship model test in a wave tank to investigate the pitch and roll responses of a fixed ship under various wave conditions. The primary objective is to measure and analyze these angles with a known incoming wave velocity.
However, I am facing difficulties in calculating the pitch and roll angles under the condition of a stationary ship and a known incoming wave velocity. This calculation is crucial for comparing the results between the scaled ship model and the actual ship.
I would be grateful if you could share any relevant resources, such as theoretical calculation methods or experimental data, that might help me address this issue.