Effect of ship motion on sonar detection performance
For an unstabilized transducer, the effect of ship motion on sonar echoes is twofold: 1. Attenuation caused by the rotational movement of the transducer in the vertical plane. The results show that the different loss figures are periodic in range . The average loss (in dB) increases about linearly with the amplitude (in degrees) of the swinging transducer. 2. Distortion caused by the irregular translational movement of the transducer in the direction of the target. In order to arrive at realistic figures for attenuation and distortion, actual ship movements are being measured. Some samples of recorded ship movement data are presented.
SourceIn: Ocean Acoustic Modelling (SACLANTCEN Conference Proceedings CP-17), Part 7, 1975, pp. 39-1 - 39-9.
Schothorst, Jaap G.