Technical information

SimradEK60
Datarecordingandplaybackprocedures
Theseproceduresexplainhowtosaveandrecallrawdata.
Topics
•Recordingrawdataonpage28
•Playbackrawdataonpage29
Relatedtopics
•FileOutputonpage123
•Replayonpage78
Recordingrawdata
Youcansetuptheechosoundertorecordunprocessedtransducersignals(sampledata)
andexternalsensorinformationontoles.Theselescontainthenecessaryinformation
toreconstructthesituationduringtherealsurvey.Theechosounderprogramreads
theselesduringreplay.
Procedure
1ClickFile→Output,andobservethattheFileOutputdialogopens.
2ClicktheDirectorytab,andclicktheBrowsebuttonifyouwishtochangethe
directorytowhichthelesarestored.
3ClicktheRawDatatabtodenehowtherawdataistoberecorded.
•Saverawdata:Start/stoprecordingofrawdata.
•Range:Selectthedepthrangetoberecorded.Thisrange,referringtothe
transducerface,isindependentofanyotherrangesettingsintheechosounder.
•Echogramdata:Thisisuserdenedexcerptsoftheprocessedsampledata(pixel
data),iethebackscattervalueofthetargets.Theechogramsarestoredastime
taggeddatagramsinseparateles.
4ClickOktoexitthedialog.
5UseeitherthetoolbarbuttonsortheSaverawdatacheckboxintheFileOutput
dialogtostartorstoprecordingofdata.
6Duringrecording,observethesizeofthestoredrawdata.
Thesizeoftherawdatalesstoreddependsonseveraluserselections.Fromthese
selectionsyoumayestimateapproximatelythetotalamountofrawdatastoredina
giventimeperiodforeachinstalledchannelusingthefollowingequation:
X=B
M243600
R8
c T
•X=Totalamountofstoredrawdatainbytesforonechannel
•B=4(Givenbytheresolutionofthesampledata)
•R=Selectedrangeinmeters(Userdened)
•c=Soundspeedinwaterinmeterspersec(Userdened)
•T=Pulsedurationinseconds(Userdened)
28
164692/D