The company is founded by a marine biologist, and the technology originated from a research lab in Saudi Arabia funded by the king. The event was hosted by iDive, which is launching an underwater iPad housing this fall.
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Are you going to tell NASA or shall I ?Ĭould the key to improving underwater communication be a technology developed for landline phones in the '60s?Īt a hackathon earlier this month in San Francisco, oceanographers and scientists from NASA, the California Academy of Sciences, University of California Santa Cruz, and other institutions gathered to figure out how to improve on the current tools of choice for marine researchers: waterproof paper and pencil. I just did a quick Google on "DTMF underwater" and got this.
They had other, er, non-disclosed schemes too, as did the Russians, during the cold war era. Navy for years used VLF (very low freq) transmissions from giant shore antennas fed by huge amounts of power, and digtal coding at just a few bits per second. e.g., at about 20GHz, the wavelength versus rain or fog water droplet size causes high losses in a narrow band of frequencies.
I know that RF in free space has odd special cases to the usual frequency dependent inverse square law (which is why we can hear Voyger's signal from outside the solar system).
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Many years ago I worked on one underwater acoustic data com project - it used a very long spreading code and the receiver operated at a large negative signal to noise ratio due to the post-detection correlation gain. And the military uses acoustics or ultraviolet for 100's of meters or more. I do know that fresh and salt water differ greatly. Is this correct? If it is then having something like 9" of submergance would be more than enough for my needs and I'll be quite pleased.Ĭheers I know a lot about the laws of physics but not so for water. So if i was to increase the power output of the transmitter by a factor of 9, I would get 3 times the penetration into the water. The attenuation of the signal is going to be some sort of a cubic function vs the power of the transmitter. Perhaps you can correct me here, but this is my understanding which, if this is true then I'll be in good shape. Thanks for your reply! I'll have to look at the performance figures for the radios I used and see if I can figure out what sort of improvement I'll get.
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