How to Achieve Omnidirectional and Three-Dimensional Underwater Acoustic Communication in the Ocean?
Underwater acoustic communication technology has evolved to the networked stage. Applying radio network technologies (Ad Hoc) to underwater acoustic communication networks enables omnidirectional, three-dimensional communication in the ocean (which can be combined with unmanned vehicles such as AUVs and UUVs). This is currently the most important and critical technology in naval operations. A common method of underwater acoustic communication employs spread-spectrum techniques, such as CDMA.
Underwater acoustic communication is extremely challenging due to multipath effects, time-varying channel conditions, limited available bandwidth, and severe signal attenuation, especially over long distances. Compared to wired communication, underwater communication has a very low data rate because it uses acoustic waves rather than radio waves.
The working principle is as follows: first, information such as text, voice, and images is converted into electrical signals by an electrical transmitter, digitized by an encoder, and then the transducer converts the electrical signals into acoustic signals. The acoustic signals travel through the water medium to the receiving transducer, where they are converted back into electrical signals. A decoder deciphers the digital information, and the electrical receiver finally renders it as sound, text, and images.
Over the past year or more, our company has collaborated closely with Xiamen University to develop underwater communication module technology, and significant progress has been made.
On December 19, 2019, technical personnel from both parties conducted on-site communication tests in the Yongtai water area of Fuzhou. Yongtai is known for its beautiful scenery and pleasant environment.
Amid the hard work of the test, we took time to enjoy the beautiful surroundings. It can be said: with picturesque mountains and rivers, the spirit is refreshed; work and leisure go hand in hand!
