4 ms·
I'm really interested in learning more about underwater ULF - can you point to any keywords, papers, or milspec prefixes to read up on? I've explored all the I
by stevenrace 12y ago
I'm really interested in learning more about underwater ULF - can you point to any keywords, papers, or milspec prefixes to read up on?
I've explored all the ISM bands - I just want to play with something even slower/longer range whilst sailing (in international waters, of course :)).
- jmah 12y agoThere 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
- dsl 12y agojmah's Wikipedia links are a good start. But be warned, water penetrating ULF is outside the scope of hobbyists and even most small governments.