Simrad PI GEOMETRY - QUICK REFERENCE GUIDE REV B Instrukcja Instalacji Strona 180

  • Pobierz
  • Dodaj do moich podręczników
  • Drukuj
  • Strona
    / 224
  • Spis treści
  • BOOKMARKI
  • Oceniono. / 5. Na podstawie oceny klientów
Przeglądanie stron 179
SimradSH90
BASICTHEORY
Thischapterexplainssomeofthebasictheoryrelatedtosettings,
errorsourcesandnoiseconditions.
Topics
Settingsonpage178
Noiseandreverberationonpage182
Layersanddeectionsonpage185
Settings
Asonarwilltransmitasoundwaveintothewateraroundthe
vessel.Whenthissoundwavehitssh,bottom,orotherobjects
inthewater,apartofthesoundwillbereturnedasechoes.
Theseechoesarecollectedbythesonar,interpretedbythesonar
computers,andpresentedonthedisplay.
Themostimportantinterpretationishoweverlefttoyou,and
itmayoftenbedifculttodistinguishtheechoesandidentify
targets.Inordertohelpyouwiththis,theSH90sonarprovides
numerousadvancedlterandgainfunctions.Youcanalsotilt
thesonarbeamverticallyinordertoachieveanoptimumresult,
andyoucanusetheverticalslicetoview“across”intothewater.
Thischapterprovidesyouwithsomebasictheoryaboutsome
ofthekeysettingsavailable.
WhatisTVG?
TVGmeansTimeVariedGain.Asechoeswillbeweaker
whenthedistancetothemincrease,thesonarwillautomatically
amplifydistantechoesmorethancloseechoes.Inpractice,the
gainwillincreaseinproportionwithhowlongthesonarmust
waitfortheechoes.
Figure39TheTVGprinciple:Thegainattime(B)islargerthanattime(A)
A
(CD015005-003)
0
1
10 100
1000
B
C
178
323775/B
Przeglądanie stron 179
1 2 ... 175 176 177 178 179 180 181 182 183 184 185 ... 223 224

Komentarze do niniejszej Instrukcji

Brak uwag