15.3Traditionalsonartechnology
Traditionalsoundersuseasinglecarrierfrequencyorcarrierwave
forthesonarping.Thesesoundersworkbymeasuringthetimeit
takesthepingechotoreturntothetransducertodeterminetarget
depth.Usingthismethodif2targetsareclosetogethertheycanbe
shownasasinglelargetarget,ratherthanmultiplesmallertargets
15.4BroadbandCHIRPsonartechnology
Broadbandsonarsuseasweptfrequency'CHIRP'signalwhichcan
distinguishbetweenmultipleclosetargets,thisenablesthesonarto
displaymultipletargetsinsteadoflargecombinedtargets.
Someofthebenetsareimproved:
•Targetresolution.
•Bottomdetectioneventhroughbaitballsandthermoclines.
•Detectionsensitivity.