Simrad ST90 - Reducing Noise and False Echoes with the Ping-Ping Filter

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Relatedtopics
Improvingtherecognitionofshandschoolsusingreceiverlters,page78
ReducingnoiseandfalseechoeswiththePing-PingFilter
ThePing-PingFilteranalysesthehistoricalinformationfrompreviousconsecutivepingsin
ordertoremoveunwantednoiseandfalseechoesfromtheST90presentation.
Context
Thefollowinglteroptionsareprovided.
•Off:SelectOfftodisablethelter.Thehistoricalinformationfromprevioustransmissions
("pings")arenotusedtoremovenoiseandunwantedechoes.
•Weak:SelectWeaktoallowtheltertocomparetheechoesfromthelatesttwopings.
Forthecurrentechotobeshown,itmustbepresentinbothofthesepings.
•Medium:ChooseMediumtocomparetheechoesfromthelatestfourpings.Forthe
currentechotobeshown,itmustbepresentinallofthesepings.
•Strong:SelectStrongtoallowtheltertocomparetheechoesfromthelatesteightpings.
Forthecurrentechotobeshown,itmustbepresentinalloftheseeightpings.
TheltersintheST90areimplementedin“series”.ThePing-PingFilteristhelastlterin
thesequence,soanychangestotheotherltersmayhaveaneffectonhowitworks.
Procedure
1Clickinanyviewtomakeitactive.
Theactiveviewisidentiedwithathickerborder.
2OpentheActivemenu.
3SelectPing-PingFilter.
4Choosetherequiredsetting.
Thechoiceyoumakeisbydefaultonlyappliedtothecurrentlyselected(active)view.
Relatedtopics
Improvingtherecognitionofshandschoolsusingreceiverlters,page78
SimradST90OperatorManual