FM Signal-Correlation Methods for Underwater Acoustic Measurement
The power spectrum of the FM signal modulated by the random signal in the form of a binary Poisson process is theoretically analyzed. It is shown that the FM signal of this type may be easily made to form both the symmetric and asymmetric, concave power spectra with respect to its centre frequency by adjusting its parameters. It is demonstrated that this procedure is applicable to compensate the narrow-band gain characteristic of the high-Q underwater acoustic transducers and to extend the effective bandwidth for the measurement. Next, it is shown how to make approximately a binary Poisson process from a. stationary Gaussian process for making practical application of this useful theoretical result. The power spectrum of the FM signal modulated by this process is in favourable agreement with the theoretical power spectrum and it is proposed that an FM signal of this type may be a useful test signal in underwater acoustic measurements. Further the polarity coincidence correlation function of this type FM signal is analyzed. Finally the measurement of the group velocity in a fluid cylinder with a free boundary is performed by using a technique of heterodyne detection.
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Document Type: Research Article
Publication date: 1977-06-01
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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