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首页> 外文期刊>ICES Journal of Marine Science >An improved multiple-frequency method for measuring in situ target strengths
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An improved multiple-frequency method for measuring in situ target strengths

机译：一种改进的多频现场目标强度测量方法

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Refinements have been made to the multiple-frequency method for rejecting overlapping echoes when making target-strength measurements with split-beam echosounders described in Demer et al. (1999). The technique requires that echoes, simultaneously detected with two or more adjacent split-beam transducers of different frequencies, pass multiple-target rejection algorithms at each frequency, and characterize virtually identical three-dimensional target coordinates. To translate the coordinates into a common reference system for comparison, the previous method only considered relative transducer positions and assumed that the beam axes of the transducers were parallel. The method was improved by first, optimizing the accuracy and precision of the range and angular measurements of the individual frequency detections; and second, precisely determining acoustically the relative positions and angular orientations of the transducers, thus completely describing the reference-system transformation(s). Algorithms are presented for accurately and precisely estimating the transformation parameters, and efficiently rejecting multiple targets while retaining measurements of most single targets. These improvements are demonstrated through simulations, controlled test-tank experiments, and shipboard measurements using 38- and 120-kHz split-beam transducers. The results indicate that the improved multiple-frequency TS method can reject more than 97% of multiple targets, while allowing 99% of the resolvable single targets to be measured.
机译：当用Demer等人的论文中描述的分束回波测深仪进行目标强度测量时，对多频方法进行了改进，以拒绝重叠的回波。 （1999）。该技术要求用两个或多个相邻的不同频率的相邻分束换能器同时检测到的回波，必须在每个频率下通过多目标抑制算法，并表征几乎相同的三维目标坐标。为了将坐标转换为通用参考系统进行比较，以前的方法仅考虑了换能器的相对位置，并假设换能器的光束轴是平行的。首先，通过优化单个频率检测的范围和角度测量的精度和精度来改进该方法。第二，在声学上精确地确定换能器的相对位置和角度方向，从而完全描述参考系统的变换。提出了算法，用于准确，准确地估计转换参数，并有效地拒绝多个目标，同时保留大多数单个目标的测量值。这些改进通过仿真，受控的试验箱实验以及使用38 kHz和120 kHz分离光束传感器的船上测量得到证明。结果表明，改进的多频TS方法可以拒绝超过97％的多个目标，同时允许测量99％的可分辨单个目标。

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