The new development of the autonomous sources for ocean acoustic navigation, tomography and communications

摘要

A tunable high-Q resonator sound source with exceptional demonstrated performance has been developed by Teledyne Marine. The sound source is efficient, powerful, and has unlimited operational depth, as well as a minimum level of high frequency harmonic content. The projector transmits a digitally synthesized frequency swept signal and the mechanical actuator tunes a high-Q organ pipe to match the frequency and phase of a reference signal. High-efficiency tunable sound sources have been deployed in the ocean over the past 15 years, and have been successfully used for ocean acoustic tomography and long range navigation. A few examples are Pacific Ocean, Pioneer Seamount (2001); MOVE Experiment (2004 - 2005); Pacific Ocean, Hoke Seamount (2002- 2004); NPAL04, SPICE04, Pacific Ocean (2004 -2005); Fram Strait 2008-2016; Philippine Sea (2009,2010-2011); Newfoundland, Canada (2014-2015), Arctic (2016-2017). Recently, it was shown that a bottomdeployed swept frequency array can be used for high-resolution seismic imaging of deep geological formations. The long-term operating experience of the sound sources requires the development of an improved sound source system. A recent development of a sound source system is considered in this paper. A finite-element analysis that shows the structural acoustics of the tunable resonator has been conducted to improve the acoustics of the sound source. The analysis gave a better solution for a tuning mechanism with a very wide frequency range. It has been shown that the organ-pipe resonator can be tuned in an octave frequency range.