Oceanography

Digital sonar design in underwater acoustics : principles - download pdf or read online

By Qihu Li

"Digital Sonar layout in Underwater Acoustics rules and purposes" presents accomplished and up to date insurance of analysis on sonar layout, together with the fundamental concept and methods of electronic sign processing, uncomplicated notion of data idea, ocean acoustics, underwater acoustic sign propagation idea, and underwater sign processing conception. This publication discusses the final layout approach and methods to implementation, the layout strategy, procedure simulation idea and methods, sonar checks within the laboratory, lake and sea, and sensible validation standards and techniques for electronic sonar layout. it's meant for researchers within the fields of underwater sign processing and sonar layout, and likewise for military officials and ocean explorers. Qihu Li is a professor on the Institute of Acoustics, chinese language Academy of Sciences, and an academician of the chinese language Academy of Sciences.

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Fig. 5 shows an example: suppose the analogue signal to be sampled is a sinusoid signal with a frequency 1; =.!.. s = 1 Hz. The sample is shown in the figure in dot sign. But we can see that these samples are also the result of sampling a signal h = _7... Hz. Clearly, to prevent this kind of phenomenon 8 occurring and to ensure that the results from a sampling operation are unique, we need some kinds of rules for the original signal to be sampled and / or the sampling frequency. The following sample theorem solves this problem.

34) Therefore, we have three equivalent definitions for the transfer function H(z): (1) H(z) is the z transfonn of the unit impulse response function; (2) H(z) is the coefficient of the output tenn zn when the input is zn; (3) H(z) is the ratio ofthe z transfonns for output and input discrete series. In general, in the z transfonn expression, the argument z is a complex variable; therefore in discussion of function H(z), the convergent zone is quite important. The following are some examples of z transfonns for special series.

Pridham, R. G, Kay, S. : Digital signal processing for sonar. In: Proc. ofIEEE 69, pp. 1451-1506(1981) [38] Lee, E. : Programmable DSPs: A brief overview. IEEE Micro. 10, pp. : Digital array phasing. J. Acoust. Soc. Amer. 32, pp. : Small signal detection in the DIMUS array. J. Acoust. Soc. Amer. 32, pp. : DICANNE, a realizable adaptive process. J. Acoust. Soc. Amer. 45-63, pp. 398-405 (1969) [42] Nichles, 1. : Programmable DIMUS processor. 1. Acoust. Soc. Amer. 51, pp. 134-138 (1972) [43] Bartram, J.

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