Abstract
The properties of time-reversing arrays (TRAs) are being investigated for both active and passive underwater applications. Previous computational and experimental investigations have shown that automatic spatial and temporal pulse compression are possible with a TRA even when the acoustic environment is unknown. It has also been found that ambient or electronic noise limits the narrow-band performance of TRAs. In this presentation, the results from a computational study of the performance of a TRA that receives and transmits broadband pulses in a noisy environment will be shown. Pulsed-signal retrofocusing is simulated in noisy free-space and sound-channel environments via Monte Carlo techniques. The noise field is treated as white in the signal band and omnidirectional in space. The sound-channel simulations are done with a Fourier superposition of calculations from a parabolic equation code (ram by M.D. Collins). Theoretical scaling laws for the probability of a retrofocus occurring as the noise level increases are also presented. At the time and place of the retrofocus, results from both approaches suggest that pulse compression allows broadband TRAs to outperform narrow-band TRAs in noisy environments. [Work sponsored by ONR, Ocean Acoustics.]
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
