Submarines and aircraft are difficult to communicate with each other when they are each in their own environment. Over the water, radio waves are used for communication, but they are muffled by a liquid in which sonars and other acoustic systems are much more effective. The Massachusetts Institute of Technology came up with an interface that would combine these two different types of communications.
The system is based on a conventional underwater acoustic radiator operating at different frequencies for encoding logical data. For example, a wave at 1000 Hz means “0”, and at 200 Hz “1”. Such a system can be multiplexed to increase the data rate. When the wave reaches the surface of the water, a ripple is created on it, which is fundamentally different from the natural sea waves – the vibrations of the medium are rapid and there are a lot of them per unit of time. It remains only to bring a radar from the plane to this section of water, to count the reflected signal and decode it.
The airborne radar operates at frequencies of 30-300 GHz, it is serviced by a powerful computer that analyzes each reflected radio beam for power and distance traveled, eliminates interference and can aim the radar to keep the specified area of water in sight. The prototype installation passed 500 tests in the basin, including the clogging of swimmers, mostly successfully. It was possible to transmit and accept whole phrases, accurate to the letter.
Scientists have great doubts that in real, turbulent and salty sea this technology will be just as effective. But even if there is not and instead of a clear, high-speed connection, we will receive only the equivalent of a flashing light, then it will be possible to teach black boxes of aircraft to send a signal about themselves directly from depth, without waiting for rescuers with underwater equipment to approach the area of the crash.js.src = “&version=v2.8”; 'script', 'facebook-jssdk'));