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关于信号持续时间的定义,评估在近距离空气炮信号上
Roel A J Müller1, Michael A Ainslie2, Michele B Halvorsen3
1TNO Acoustics and Sonar, Oude Waalsdorperweg 63, 2597 AK Den Haag, the Netherlands.
The Journal of the Acoustical Society of America
|June 29, 2023
概括
水下噪声的90%能量信号持续时间 (τ90%) 对于影响评估来说是不可靠的. 这种指标往往会误解信号.
科学领域:
- 声学 声学 在声学方面
- 海洋生物学 海洋生物学
- 环境科学 环境科学
背景情况:
- 水下噪声影响评估通常使用90%能量信号持续时间 (τ90%) 来定义短暂信号长度.
- 根平均平方 (rms) 声压通常计算在此 τ90%的时间内,以评估噪声影响.
研究的目的:
- 调查90%能量信号持续时间 (τ90%) 的可靠性,以表征海洋地震气炮信号.
- 为了确定对影响评估准确表示信号持续时间的90%的限制.
- 提出和展示用于水下噪声分析的替代性,更稳定的指标.
主要方法:
- 分析了大量的海洋地震气枪信号测量的数据集.
- 将90%的时间与信号特征进行比较,特别是泡期 (初级脉冲和二级脉冲之间的间隔).
- 对t90%对信号变化的稳定性和灵敏性的评估.
主要成果:
- τ90%经常接近泡期或其倍数,测量的是静默而不是信号能量.
- 信号持续时间的量化不一致,原因是t90%的信号结构灵敏度,导致不稳定的rms声压值.
- 微小的信号变化导致显著的90%波动,损害了度量可靠性.
结论:
- 对于对短暂的水下噪声,特别是来自气枪的噪声的影响评估,90%的度量通常不适合.
- 替代指标提供了更高的稳定性和准确性,以表征短暂信号的声压水平.
- 采用更强大的指标对于可靠的水下噪声影响评估至关重要.
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