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Modeling the signal processing of a multi-sonar system to determine interference solutions.

机译：对多声纳系统的信号处理进行建模以确定干扰解决方案。

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摘要

The quality of a multibeam echo-sounder sonar (ES) signal used in seafloor mapping is degraded by an interfering sidescan sonar (SS) signal. The ES and SS signals occur at approximately the same time, are in the same frequency band, and arrive from approximately the same direction. The ES signal is a 2 ms continuous wave pulse with a first null bandwidth of 1 kHz centered at 187.5 kHz. The interfering SS signal is an 8 ms linear frequency modulated chirp with a bandwidth of 2.5 kHz centered at 183 kHz.;The presence and properties of the interfering SS signal are explained using a model of the ES signal processing. Model results as well as spatial and temporal frequency analysis of the recorded ES signal show that most of the interfering SS signal can be removed by zero phase filtering with a 10 tap boxcar filter. This additional filtering reduces the resolution of the multibeam echo-sounder system from 1.318 meters to 1.873 meters. Because this reduction in resolution is not acceptable, the design trade-offs of moving either the ES or SS frequency bands are discussed.;Statistical analysis of seafloor detections, before and after the additional frequency filtering shows that there is a difference between filtered and unfiltered detections that is dependent upon the angle of arrival. The unfiltered detections are on average between 0.4% and 1.6% deeper than the towfish altitude of 50 m.
机译：在海底标测中使用的多光束回声-声纳（ES）信号的质量会因干扰侧扫描声纳（SS）信号而降低。 ES和SS信号大约在同一时间出现，在相同的频带中，并且从大约相同的方向到达。 ES信号是2 ms连续波脉冲，具有以187.5 kHz为中心的1 kHz第一空带宽。干扰SS信号是一个8 ms线性调频线性调频脉冲，其中心频率为183 kHz，带宽为2.5 kHz。;使用ES信号处理模型解释了干扰SS信号的存在和性质。模型结果以及所记录的ES信号的时空频率分析表明，可以通过使用10抽头棚车滤波器进行零相位滤波来去除大部分干扰SS信号。这种额外的过滤将多光束回声测深仪系统的分辨率从1.318米降低到1.873米。因为这种降低分辨率是不可接受的，所以讨论了移动ES或SS频带的设计权衡。;在附加频率滤波之前和之后对海底检测的统计分析表明，滤波后和未滤波之间存在差异取决于到达角度的检测。未过滤的探测物平均比50 m的拖鱼高度深0.4％至1.6％。

著录项

  • 作者

    O'Donnell, Brian.;

  • 作者单位

    University of New Hampshire.;

  • 授予单位 University of New Hampshire.;
  • 学科 Physical Oceanography.;Engineering Electronics and Electrical.;Engineering Marine and Ocean.;Physics Acoustics.
  • 学位 M.S.
  • 年度 2009
  • 页码 56 p.
  • 总页数 56
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;海洋工程;无线电电子学、电信技术;声学;
  • 关键词

  • 入库时间 2022-08-17 11:38:26

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