Installation manual

Operationalprocedures
Howtoremovenoisefromthesensordata
TheMultipathFilterisdesignedtoremedyforreections,spikesandtime-laginthe
sensordata.Theseproblemsmayoccurifneighbouringchannelsareused,orifthePI50
isdisturbedbyotherhydroacousticsystemsinuseonownorothervessels.
Whenyouoperateinareaswithsubstantialreverberationduetothebottomconditions,
orinshallowwaters,youmayexperience“jumps”orspikesinthedatareceivedfrom
thesensors.Sucherrorscanalsobecausedbyothertypesofhydroacousticequipment
operatingonthePI50frequencyrange.Thislterhasbeenimplementedtoremedyfor
suchinterferenceproblemaswell.
Figure38Spikes
dB
f
(CD0121 16-002)
AStabledatareading
BSpikecausedbyreections,time-lag,
reverberationorinterference
TheMultipathFilterisavailablebothontheOperationmenuandintheReceiverdialog.
1ClicktheSetupiconundertheMainmenutoopentheSetupmenu.
→Setupmenuonpage112
2ClickReceivertoopentheReceiverdialog.
3ChangethestatusoftheMultipathFilter.
WerecommendthatyouswitchthislterOniftherearelargeuctuationsin
thedisplayeddata,oriftherateofchangeissmall.Nolteringispreferableif
instantaneousreadingsarerequired,sincethisshortensthedelaybetweenupdating
thechangesinsensordata,andthecorrespondingdisplayedinformation.
ThedefaultsettingoftheMultipathFilterisOn.
4ClickOKtosavethecurrentsettingsandclosethedialog.
Howtosetupspreadanddepthsensorstomeasurevertical
geometry
Ifyouhaveonedepthsensormountedoneachtrawldoor,youcanmakethePI50
calculatetheverticalgeometry.Thesystemwillthenreadeachofthetwodepthvalues,
subtractonefromtheother,andshowyouthedifference.
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