Abstract
In order to obtain the normal acoustic reflection coefficients of underwater acoustic materials in the free field with the wideband pulse signal, a new measuring method with a single vector hydrophone and the post-processing inverse filtering is put forward. Numerical simulations had been conducted to comparatively analyze the measurement performances of the measuring method. The simulation results show that the present method should be established on the high ratio of signal to the noise and it is not sensitive to the system error. The experiment result shows that the post-processing inverse filtering measuring method is more effective comparing with the method without the post-processing inverse filtering, especially the measurement consequence of the post-processing inverse filtering measurement method tends to the theoretical value when the frequency is higher than 2.5 kHz, because limitation of the transducer.
Highlights
The Reflection Coefficients Measurement Method for the Underwater Acoustic Materials Based on the Single Vector Hydrophone
The simulation results show that the present method should be estab⁃ lished on the high ratio of signal to the noise and it is not sensitive to the system error
The experiment result shows that the post⁃processing inverse filtering measuring method is more effective comparing with the method without the post⁃processing inverse filtering, especially the measurement consequence of the post⁃processing inverse filtering measurement method tends to the theoretical value when the frequency is higher than 2.5 kHz, because limitation of the transducer
Summary
式中, rxy 为系统输入输出的互相关函数,rxx 为输入 信号的自相关函数。 由于 MLS 序列具有较好的自 Ï í ï ï éêcos( θi ) + Rs( f) e -jωτr cos( θr ) ëê + D( f) e -jωτe cos( θe ) + Rq( f) e -jωτq cos( θq ) Ï îïï éêsin( θi ) + Rs( f) e -jωτr sin( θr ) ëê + D( f) e -jωτe sin( θe ) + Rq( f) e -jωτq sin( θq ) Ï ï ï ï éê1 + Rs( f) e -jωτr ùú ëê + D( f) e -jωτe + Rq( f) e -jωτq ûú ïVxpost( f) ≈ s( f) ·
Sign-in/Register to view highlights & summary 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 callMore From: Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University
Disclaimer: 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.
