EvoLogic developed and patented their Sweep Spread Carrier (S2C) technology to manage the challenging conditions presented by ocean waters. They developed underwater sensors that can transmit frequencies similar to those emitted by dolphins. These sensors can be used to detect underwater earthquakes and therefore aid in tsunami warning systems. They can also be used for guiding ships. According to their website, "To mimic dolphin sound pattern, modems built on S2C technology continuously spread the signal energy over a wide range of frequencies and adapt the signal structure so that the multipath components do not interfere with each other. At the receiver end, advanced signal processing collects the energy and converts the received signals into narrow band signals. This results in achieving significant depression of multipath disturbances and substantial system gain, enabling successful decoding of signals also in crucial environments even when they are heavily masked by noise."
According to EvoLogic's website, "Offshore operation demands that all
systems must work even under harsh conditions. The key to this success
is to have a reliable data connection with any malfunction increasing
the risk to the operation. Under good conditions, currently available
underwater modems can transmit data satisfactorily. However, when the
hydroacoustic conditions turn worse due to interfering noise and varying
multipath propagation etc., a superior technology modem is required.
Even in calm seas, the stratification of water body can cause severe
signal reverberations and dynamic fluctuation of channel properties,
resulting in poor transmission."
Earthquakes and the tsunamis they can generate cause deaths, long-term suffering by survivors, widespread devastation, and environmental damage in areas even far from the quake epicenter. An early detection system can prepare residents to evacuate even sooner, and perhaps take precautions to reduce damage to infrastructure.
The device is based on eight years of research on the physics of dolphin communication. According to the website, "Dolphins and whales have adapted to the situation under water very well, communicating over long distances. They chirp and sing across a broad frequency bandwidth. This continuous change of frequencies not only serves to transmit information, but also to compensate for sources of interference such as echoes and noise."