2 ms·
There a little here: http://en.wikipedia.org/wiki/Communication_with_submarines http://en.wikipedia.org/wiki/Communication_with_submarines and interesting deta
by jmah 12y ago
There a little here: http://en.wikipedia.org/wiki/Communication_with_submarines http://en.wikipedia.org/wiki/Communication_with_submarines
and interesting detail here: http://en.wikipedia.org/wiki/Project_Sanguine http://en.wikipedia.org/wiki/Project_Sanguine
- stevenrace 12y agoThanks guys. I was familiar with Project Sanguine, but had hoped there were less ambitious public projects I had overlooked (perhaps closer to VLF which operates <30m seawater depths). After reading about the Navy E-6B aircraft, which trails a 5km antenna behind it to communicate with subs, I had presumed modern 'submarine -> other underwater radios' were akin to large commercial fishing trawling nets - or the really long antennas were packed into hilbert curves and epoxied to the hulls or something. Anyhow, it seems 'acoustic modems' using 'CSMA' [1] are the norm for commercial underwater ROVs (such as James Gosling's 'wavegliders' [2]). [1] http://www.mit.edu/~millitsa/resources/pdfs/royal.pdf http://www.mit.edu/~millitsa/resources/pdfs/royal.pdf [2] http://liquidr.com/prodserv/wg/gateway.html http://liquidr.com/prodserv/wg/gateway.html