8922-00027021/2.2
Systemdescription
TheSimradFM90isathird-wireMultibeamTrawlSonar.Itallowsforaccurateand
efcientmonitoringofthenetopening,thecatchsituation,andtheshingconditions.
TheFM90hasafastrefreshratethatallowsyoutoviewthesonarimagesinrealtime.
TheSimradFM90Multibeam
TrawlSonarprovides
signicantimprovementsover
theSimradFS70TrawlSonar
andotherscanningsonars.The
FM90Sonarcommunicates
withthevesselbymeansofa
third-wiresystemusingvery
highbit-ratedigitalsubscriber
line(VDSL2)communication,
transmittingreal-timeimages
ofthenetopeningatrapidrefreshrates.Inaddition,anechosounderlookingup("up
sounder")monitorsshescapingoverthenet,whileanotherechosoundershowsthe
foot-rope,theseabottom,andtheshenteringthenet.
BymeansofthesubmergedTrawlUnit,theFM90communicateswithanumberof
SimradPI/PX40kHzcatchmonitoringsensorsbymeansofhydroacousticlinks.Upto
sixmeasurementscanbemadesimultaneously.TheFM90supportspitch,roll,depth,
catch,bottom-contact,temperature,spread,height,andgeometrysensors.Standard
pitch,roll,depth,andtemperaturesensorsarealsobuiltintotheTrawlUnit.
TheFM90isasolid-statesonarsystem.Thisdesigneliminatesmovingparts,and
increasesreliabilityandavailabilityduringshingoperations.
TheFM90DeploymentPackhasayellow
topandblackbottomtoassistyouinvisual
conrmationpriortolaunchandtoassistin
visualsightingduringrecovery.Itisquicklling
andquicktodrain.Ithasimprovedhandholds
toassisthandling—evenwithgloveson.The
strainreliefcanbeaccessedusingstandardtools
withoutopeningtheentireDeploymentPack.
Specicationsandfunctionality
TheFM90isauniquesonar,bothindesignandfunctionality.WhentheFM90sonar
pings,itsendsoutsoundenergyina240-degreesector.Thisenergyisreectedfrom
thenet,fromsh,andfromothertargetsinthewatercolumn.Thereectedenergyis
receivedbythetransducer,processed,andshownonthedisplay.BecausetheFM90
pingsacrossawideareainoneping,therefreshratetogenerateapictureofthenet
openingisalmostinstantaneous.Thisgivesyoureal-timeimages,allowingyoutoadjust
toveryfastmovementsofshschools.
SimradFM90Quickstartguide