R2Sonic 2022 - Page 9

Page 9 of 133
Version 3.0 REV r000
Date 25-08-2010
Appendix III: Offset Measurement
10 Lever Arm Measurement – Offsets ........................................................................................ 93
10.1 Vessel Reference System ...................................................................................................... 93
10.2 Measuring Offsets ................................................................................................................ 94
10.2.1 Sonic 2024 Acoustic Centre .......................................................................................... 94
10.2.2 Horizontal Measurement ............................................................................................. 94
10.2.3 Vertical Measurement .................................................................................................. 94
Appendix IV: The Patch Test
11 Introduction .......................................................................................................................... 97
11.1 Orientation of the Sonic 2024/2022 Sonar Head ................................................................. 97
11.2 Patch Test Criteria ................................................................................................................ 98
11.2.1 Latency Test .................................................................................................................. 98
11.2.2 Roll Test ........................................................................................................................ 99
11.2.3 Pitch Test .................................................................................................................... 100
11.2.4 Yaw Test ...................................................................................................................... 101
11.3 Solving for the Patch Test ................................................................................................... 102
Appendix V: Sound in Water
12 Introduction ........................................................................................................................ 103
12.1 Sound Velocity .................................................................................................................... 103
12.1.1 Salinity ........................................................................................................................ 105
12.1.2 Temperature ............................................................................................................ ... 105
12.1.3 Refraction Errors ......................................................................................................... 105
12.2 Transmission Losses ............................................................................................................ 106
12.2.1 Spreading Loss ............................................................................................................ 106
12.2.2 Absorption .................................................................................................................. 107
12.2.3 Reverberation and Scattering ..................................................................................... 111