冰河期
发表于 2025-3-25 03:55:43
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abolish
发表于 2025-3-25 09:03:25
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苦恼
发表于 2025-3-25 12:13:03
Sound Transmission Fundamentals,onsiderable scope, as figure 1.1 illustrates, our interest will lie particularly in applications involving sound transmission in the sea and in its underlying sediment layers and rock strata. Sound transmission is the single most effective means of directing energy transfer over long distances in se
Encapsulate
发表于 2025-3-25 17:37:16
The Sonar Equations, processes has to do with determining the extent to which the received signal exceeds, or is swamped by, such corrupting influences as may exist. In electromagnetic detection equipments — radio and radar systems — antenna- borne signals are of such small size that the significant corrupting influenc
Engaging
发表于 2025-3-25 20:26:33
Characteristics and Analysis of Sonar Waveforms,been adequate to restrict consideration of such processes only to the time-domain signals emerging from the outputs of each of the hydrophones used for signal detection. Increasing computing power, together with a rapid evolution in appreciation of the mathematics of signal analysis and its applicat
全面
发表于 2025-3-26 01:05:32
Ray Trace Modelling of Sonar Propagation, performance than do the sonar equations, which would usually be used as a “first cut” and preferably “worst-case” approach to system design. Sonar modelling is of great importance in deducing the path traversed by sound as, for example, in seismics — where it is required to determine the thickness
有斑点
发表于 2025-3-26 08:20:42
Normal Mode Modelling of Sonar Propagation,will exist a multiplicity of reflected image sources. Given iso-speed conditions, the ray paths from these sources will be straight lines. In water whose depth is moderately shallow with respect to range, there may be sufficiently few bounces for the problem of estimating the summed sound intensity
不适当
发表于 2025-3-26 12:03:51
Noise and Reverberation,onar system performance. Whilst it is true that both sources of corruption can co-exist, it is most common to find that one of the two will predominate. Notice that in a noise-limited sonar, increasing the signal power will improve the signal-to-noise ratio and hence the system performance. The same
COWER
发表于 2025-3-26 12:46:06
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独行者
发表于 2025-3-26 18:31:06
Sonar Engineering and Applications,blems. It is a matter of some regret that the history attaching to the development of the subject of underwater acoustics is relatively poorly documented. As history, the documentary material is of relatively recent origin and is frequently difficult to gain access to because of the explicitly milit