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Modeling and Researching of a Horizontally Iterative Raytracing Model with a Sound Profile’s Constructing

Author: YuanZuo
Tutor: TaoJinXu
School: University of Science and Technology of China
Course: Signal and Information Processing
Keywords: Voice model Level of recursion B - spline Cubic Spline Sound speed profile Interpolation algorithm
CLC: TB566
Type: Master's thesis
Year: 2009
Downloads: 9
Quote: 0
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Abstract


This paper studies the ocean sound field in a sound line model, this model can be applied to underwater sonar, development of marine resources and the marine environment monitoring technology. This model is based on the speed of sound is configured ocean acoustic energy propagation path, sound attenuation, delay, etc.. In this paper, B-spline method to construct sound speed profile, to overcome the conventional cubic spline interpolation, established a good foundation for the structure of the sound of the line model containing less than larger inflection point curve interpolation. The need to use a more accurate model of the voice sound speed profile structure in order to be reasonably sound ray propagation path. In the conventional interpolation method, if there is greater inflection make interpolation curve obtained between the adjacent two of the sample point and the inflection point about significant fluctuations, resulting in non-monotonic distribution of the curve, with the actual sound velocity In addition, we will produce sharp raised very different. Cubic spline interpolation can smooth episode within the lines, but in the face of the wave phenomena can only be discarded a singular kind of point to ensure that the curve overall monotony, however, dropped in on the location of the sample point the interpolation offset. As the B-spline curve by adjusting the parameters to change the shape of the curve, and thus be able to maintain the integrity of each sampling point using the B-spline interpolation, and at the sample point deviation, so you can retain each curve sample point without having to be disposed of in order to smooth the curve part of the sample points, both the smoothness and consistency requirements. Through the analysis of the text, find reasonable method to adjust the parameters of the B-spline interpolation curve is smoothed, and to meet the requirements of the model of the acoustic line of the curve derivative. This article using voice recursive model along the horizontal direction, and combined with the sound speed profile of the B-spline interpolation. Read a lot of today's sound-line model, found that the horizontal direction of the recursive little sound line model, most voice track recursive. Principle, both starting from a different perspective, similar conclusions, however, because lt; Computational Ocean Acoustics gt; widely circulated far-reaching in the country, paid more attention to some of the latter obtained. The general marine sound field analysis will be the speed of sound is set as a function of depth. Under this condition, the most primitive acoustic line constructor method is acoustic medium divided by depth, split out of the segment length is determined by the calculated step length. The speed of sound within each segmented linear change, then the eikonal the sound line trajectory depicted paragraph boundary line between paragraphs of sound connected by Snell's law. This method involves a hierarchical selection, in order to avoid the offset caused by the stratification on sound lines generally use the voice of the iterative algorithm expand sound line trajectory coordinates. Although this approach progress on the full advantage of the sound speed profile in each iteration, however need to convert the horizontal coordinates and depth coordinates to determine whether there interface reflection. Acoustic line along the horizontal direction iteration algorithm is used, the individual elements after each recursion: transmission time, and the exit angle, the wave front coordinates, are directly associated with the horizontal distance, and thus in each iteration without having to coordinate conversion can easily direct control submarine topography voice reflection operation. The results of this paper include: the special requirements of the method of analysis of the level of recursion, the sound speed profile, details how to use the B-spline constructed in line with the derivative, the the continuity order requires the sound speed profile; B-spline at the same time provide any position interpolation point calculation, which makes only need to calculate the speed of sound of the desired depth without depicting the entire speed profile, to reduce the computational overhead in the recursion process; Finally, the horizontal recursive model of the acoustic line simulation experiment, the intrinsic sound line extraction, the propagation time calculation.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Underwater Acoustics > Underwater acoustic detection
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