Kongsberg Simrad SN90 Reference Manual page 14

Simrad SN90
Software License page..........................................................................................603
Transceiver Upgrade page ....................................................................................605
Pages in the Echogram dialog box.................................................................................606
Lines page.............................................................................................................606
Echogram page .....................................................................................................609
Horizontal Axis page............................................................................................612
Pages in the Information Pane Options dialog box........................................................614
Size Distribution page ..........................................................................................614
Fish Position page ................................................................................................617
Bottom Detection page .........................................................................................620
Fish Size Adjustment page ...................................................................................622
School Mass Adjustment page .............................................................................623
CONCEPT DESCRIPTIONS .................................................... 625
Important settings ..........................................................................................................626
AGC (Automatic Gain Control) ...........................................................................626
TVG (Time Variable Gain)...................................................................................627
Basic sonar theory..........................................................................................................630
Vessel coordinate system......................................................................................631
Layers and deflections ..........................................................................................633
What is sampling? ................................................................................................635
Acoustic noise................................................................................................................636
Introduction to the acoustic noise challenge ........................................................636
Contributing factors..............................................................................................636
Self noise ..............................................................................................................638
Ambient noise.......................................................................................................641
Electrical self noise ..............................................................................................641
Reverberation .......................................................................................................641
Some means to reduce acoustic noise ..................................................................643
TECHNICAL SPECIFICATIONS.............................................. 645
DATAGRAM FORMATS .......................................................... 646
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381294/E