Designing an Acoustic Modem for an AUV

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Designing an acoustic modem for an AUV involves integrating a suitable signal generator and transducer for effective underwater communication. The initial idea of using DTMF encoding was deemed unsuitable due to non-linear output stages, leading to the suggestion of AFSK as a better alternative. The project requires a duplex communication link capable of handling specific commands and values over a maximum distance of 100 meters, with a target data rate of less than 50bps. Considerations for optimal acoustic frequencies indicate that lower frequencies may provide better range and reliability, especially in freshwater environments. The discussion emphasizes the importance of error detection and protocol development for successful data transmission.
  • #31
Berkeman,
I'm a very active diver and I can't say I've ever heard about anyone ever having trouble with depth sounders on boats which normally operate at 50, 60, 98, and 200 kHz. There is an organization called DAN, the Divers Alert Network which is free to contact and will answer diver medical related questions. You can contact them on the web at www.diversalertnetwork.org .

Michael,
Sure feel free to drop me a line. I can be reached at home at dakin@shaw.ca or at work at tom@aml.bc.ca. I'm on Vancouver island in Canada so if you are in the UK there is an 8 hour difference.

I'm in the process of designing a coded underwater comm system for divers so I'll be looking into similar stuff as well.

Tom
 
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  • #32
The circuit is right ?and it can work correctly ?
 

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