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#News(IoTStack) [ via IoTForIndiaGroup ]
TARF is a new approach to converting sonar to radar without any intermediary steps
The challenge that has stymied submarine communication for more than a century is that what works well in water doesn’t work so well in the air, and vice versa. “A wireless signal works well in a single medium,” says Fadel Adib, the principal investigator for MIT’s Media Lab, where the technique was developed. “Acoustic works underwater, radio frequencies in the air.”There have been previous attempts to use just one signal to communicate directly with submerged vessels, mostly using extremely low frequencies (ELF). ELF transmissions broadcast in the 3- to 300-hertz (Hz) range. Although they travel better underwater than traditional radio frequencies, they also have wavelengths thousands of kilometers long. As such, they require kilometers-long antennas. That’s not something that can be easily installed on a submarine, though ELF projects have been constructed.
Rather than trying to find one signal that can work in both mediums, the
MIT team focused its attention on the boundary separating them. If sonar and radio both rule over their respective domains, why not develop a way for the signal to seamlessly transition from sonar to radio? So they developed TARF: Translational Acoustic-RF communication. The team is presenting a paper on TARF at SIGCOMM 2018.
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