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首页> 外文期刊>Aquatic Living Resources >Split-beam sonar observations of targets as an aid in the interpretation of anomalies encountered while monitoring migrating adult salmon in rivers
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Split-beam sonar observations of targets as an aid in the interpretation of anomalies encountered while monitoring migrating adult salmon in rivers

机译：对目标进行分束声纳观测，以帮助解释在监测河流中成年鲑鱼迁徙时遇到的异常

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摘要

The experiments described in this paper relate known target configurations under controlled conditions to acoustic characteristics of multiple moving fish. We wanted to further our understanding of the interactions between targets and the effects these interactions have on the measurement of the number of salmon migrating in rivers. Multiple targets in various configurations were passed through a horizontally oriented 4degrees x 10degrees beam from a split-beam echo sounder. The effects on measurements of target strength, detection probability and target location in the beam are presented. The observed target strength was not dependent on target velocity. There was a reduction in target detection due to the single-target selection criteria implemented by the hydroacoustic system. We mimicked the conditions in a river where a close range fish target may modify the beam geometry allowing detection of previously undetected targets. We demonstrated some of the effects resulting from moving targets into radial alignment and we demonstrated shadowing conditions that can cause extinction of target echoes.
机译：本文所述的实验将受控条件下的已知目标配置与多条运动鱼类的声学特性相关联。我们希望进一步了解目标之间的相互作用以及这些相互作用对河流中鲑鱼迁移数量的测量的影响。各种配置中的多个目标穿过来自裂束回声测深仪的水平定向4度x 10度光束。提出了对测量目标强度，检测概率和目标在光束中的位置的影响。观察到的目标强度与目标速度无关。由于水声系统执行的单目标选择标准，目标检测有所减少。我们模仿了河流中的条件，在该条件下，近距离鱼目标可能会修改波束的几何形状，从而可以检测以前未检测到的目标。我们演示了将目标移动到径向对齐中所产生的一些影响，并演示了可能导致目标回波消失的阴影条件。

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