Abstract: A vessel environment condition assessment system and method, the system comprising a motion measurement unit on board a vessel configured to sense the vessels motion, wherein the motion measurement unit is configured to output a motion signal of the vessel, a processor adapted to receive the motion signal of the vessel, and apply an energy operator to the motion signal to calculate an energy signal representative of the environmental condition for the vessel.

Abstract: A vessel environment condition assessment system and method, the system comprising a motion measurement unit on board a vessel configured to sense the vessels motion, wherein the motion measurement unit is configured to output a motion signal of the vessel, a processor adapted to receive the motion signal of the vessel, and apply an energy operator to the motion signal to calculate an energy signal representative of the environmental condition for the vessel.

Abstract: The invention is a method that combines the following components: a high pass filter designed to have sufficiently small phase delay and roll-off value in transition band as well as sufficiently good attenuation; a distortion detection and reconstruction introduced by the application of the high pass filter by extraction the significant frequency components in relevant frequency band; a signal compensation that reshapes the output of the high pass filter by matching the filter's phase delay and attenuation characteristics so as to approximate low frequency component extraction that would be produced by an ideal filter (very sharp frequency transition and no delay); a time-domain detection and correction method that addresses special circumstances under which the compensation would be inaccurate to achieve real-time estimate in normal circumstances, and a time-domain correction method during and immediately after sudden changes in composite signal (spike) is detected.

Abstract: The invention is a method that combines the following components: 1. a high pass filter designed to have sufficiently small phase delay and roll-off value in transition band as well as sufficiently good attenuation; 2. a distortion detection and reconstruction introduced by the application of the high pass filter by extraction the significant frequency components in relevant frequency band; 3. a signal compensation that reshapes the output of the high pass filter by matching the filter's phase delay and attenuation characteristics so as to approximate low frequency component extraction that would be produced by an ideal filter (very sharp frequency transition and no delay); 4. a time-domain detection and correction method that addresses special circumstances under which the compensation would be inaccurate to achieve real-time estimate in normal circumstances, and 5. a time-domain correction method during and immediately after sudden changes in composite signal (spike) is detected.