| 梁镜,许枫,张纯,马龙双.声学回波统计的鱼群密度评估方法*[J].,2019,38(2):279-286 |
| 声学回波统计的鱼群密度评估方法* |
| An acoustic approach of fish number density estimation with echoes statistic |
| 投稿时间：2018-06-06 修订日期：2019-03-01 |
| 中文摘要: |
| 与传统的回波积分法相比，回波统计鱼群数量密度评估方法具有无需回波信号绝对量和鱼群中个体鱼的平均目标强度先验知识的优点。对该方法在鱼群数量密度评估上的应用问题进行了实验研究，并针对其中鱼群密度分布的不均匀性及统计样本量偏少导致评估结果偏差的问题，提出了一种基于能量阈值的鱼群回波数据预处理方法和统计样本的改进抽样方法，有效提高了该方法鱼群密度评估的精确度。与传统的回波积分法评估结果的对比分析表明，该评估方法适用于低密度鱼群的评估。 |
| 英文摘要: |
| Fish number density can be determined from echoes statistic approach. Compared with the conventional echo-integration method of fisheries acoustics, the two main advantages of the echoes statistic approach are that no absolute amount of the sonar echo signal and no knowledge of fish target strength is required. This paper presents an experiment study on the fish number density estimation application of this method. For questions that the estimation result will be bias as the inhomogeneity of the fish number density distribution and the lack of statistic samples in cruise survey, a method of data choosing based on energy threshold and an improvement of the sampling method is proposed. The contrastive analysis with the traditional echo integration method estimation results using fish observing experiment data demonstrate that this method is appropriate in low fish density situation. |
| DOI：10.11684/j.issn.1000-310X.2019.02.019 |
| 中文关键词: 鱼群密度 回波统计 声学评估 回波积分 |
| 英文关键词: fish number density, echoes statistics, acoustic estimation, echo integration |
| 基金项目:国家自然科学基金项目 (11774376), 国家海洋公益性专项资助项目 (201505025), 山东省科技发展计划资助项目 (2013GHT11517, 2014GGF01078) |
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