Multibeam sonar systems provide highly accurate bathymetry charts. Their accuracy is dependent on several factors.
- Knowing the position of the transducer head relative to the earth, vertically and horizontally. This data is a starting point for the acoustic pulse.
- Knowing the pitch, roll and yaw angles of the transducers head. This data gives a start and finish orientation for the transducer head.
- Knowing the sound speed at the transducer head. This allows the determination of the arrival angles of the various beams relative to the transducer head.
- Knowing the sound speed profile from the transducer head to the sea floor. This allows the sonar processor to calculate range and to correct for refraction (bending) of the acoustic beams.
AML Oceanographic instruments and sensors are used to correct the latter two sources of multibeam error.