R2Sonic 2026, Operation Manual

Page: 11 / 254

Page 11 of 254
Version 6.3 Rev r012
Date 05-11-2022
11.7.2 Feature chose for the test .......................................................................................... 169
11.7.3 Water depth ............................................................................................................... 170
11.7.4 Use predefined survey lines ...................................................................................... 170
11.7.5 Speed.......................................................................................................................... 170
11.7.6 Vessel line up ............................................................................................................. 170
11.7.7 Pole variability ........................................................................................................... 170
11.8 Improving the Patch Test and Patch Test results .............................................................. 171
11.8.1 Need to collect sufficient data .................................................................................. 171
11.8.2 Individually solving values ......................................................................................... 172
11.9 Truthing the patch test ...................................................................................................... 172
12 APPENDIX VI: Basic Acoustic Theory .................................................................................. 173
12.1 Introduction ........................................................................................................................ 173
12.2 Sound Velocity .................................................................................................................... 173
12.2.1 Salinity ........................................................................................................................ 175
12.2.2 Temperature ............................................................................................................... 175
12.2.3 Refraction Errors......................................................................................................... 175
12.3 Transmission Losses ............................................................................................................ 176
12.3.1 Spreading Loss ............................................................................................................ 176
12.3.2 Absorption .................................................................................................................. 177
12.3.3 Sound Absorption Graphs at Select Frequencies ....................................................... 180
12.3.4 Reverberation and Scattering ..................................................................................... 184
13 APPENDIX VII: Sonic MBES Mounting: Sub-Surface (ROV/AUV) .......................................... 185
13.1 Installation Considerations ................................................................................................. 185
13.1.1 Ethernet wiring considerations .................................................................................. 186
13.2 Data Rates .......................................................................................................................... 186
13.3 ROV Installation Examples .................................................................................................. 187
13.4 Power Requirements .......................................................................................................... 189
13.4.1 Common mode noise rejection .................................................................................. 191
13.4.2 SIM Power connections .............................................................................................. 192
13.5 SIM Installation – ROV ........................................................................................................ 193
13.6 SIM Installation – AUV ........................................................................................................ 194