Re: underwater noise experiment

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Article #7880

#7880

From: rovero
Date: Thu, 24 Mar 1994 20:03

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In <1994Mar24.102010.14205@aifh.ed.ac.uk>, bridget@aifh.ed.ac.uk (Bridget Hallam) writes:
>In article <Cn4n4B.L80@ra.nrl.navy.mil>, dacol@i7140a.nrl.navy.mil (Dalcio
>Dacol) writes:
>#
>#      Moreover, a typical oil tanker will radiate in the same
>#      frequency range at levels ABOVE 200 dB, significatively
>#      louder than the experiments source.
>
>Then how will it be possible to detect the experiment's sound source all the
>way across the ocean, given that there's so much shipping noise??

The 20-minute transmission is a series of what are called M-sequences.
The receiver at the destination uses a matched filter that effectively
compresses the transmission to a single short pulse.  Without this
signal processing, the signal would be lost in the normal ambient noise.

P.J. Rovero                   Internet: rovero@oc.nps.navy.mil
Code OC/Rv                    Packet:   kk1d@k6ly
Naval Postgraduate School
Monterey, CA 93943

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<2mnrda$b12@galaxy.ucr.edu> <egeisler.764383985@qualcom> <Cn4n4B.L80@ra.nrl.navy.mil> <1994Mar24.102010.14205@aifh.ed.ac.uk>

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From: rovero@oc.nps.navy.mil
Subject: Re: underwater noise experiment
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References: <2mnrda$b12@galaxy.ucr.edu> <egeisler.764383985@qualcom> <Cn4n4B.L80@ra.nrl.navy.mil> <1994Mar24.102010.14205@aifh.ed.ac.uk>
Date: Thu, 24 Mar 1994 20:03:43 GMT

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