IMOS - ANMN Passive Acoustic Observatory at Portland, VIC (PAPOR)

IMOS - ANMN 被动声学天文台，位于维多利亚州波特兰 (PAPOR)

• 批准号: global : 0ee935c4-d8d8-4fdf-92fe-49292c554bfa
• 负责人: McCauley, Rob
• 金额: --
• 依托单位国家: 澳大利亚
• 财政年份: 2009
• 资助国家: 澳大利亚
• 起止时间: 2009-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://researchdata.edu.au/imos-anmn-passive-vic-papor/476354
• 关键词: IMOS; ANMN; Passive; Acoustic; Observatory

The Portland Passive Acoustic Observatory consists of two to four moorings fitted with hydrophones set on the seabed at ~170 m depth that record noise in the ocean. This system can be used to monitor whale and fish migrations, seismic activity and other natural and man-made noise sources. If four moorings are set they are configured with a mooring at each apex of an approximate equilateral triangle of 5 km side with the fourth mooring in the triangle centre. Temperature loggers are set on each mooring at the seabed.<br /> <br /> Each logger records at a sampling rate of 6 kHz for between 3-8 min of every 15 min. If four loggers are set a 22 kHz recording is also made once a day to allow accurate synchronisation of the instrument clocks. This is required for locating the source of a sound based on its time of arrival at each hydrophone in the array. A 7 kHz pinger set on the central mooring pings for 35 minutes at a 20 s interval once per day to overlap the 22 kHz sample.<br /> <br /> Raw data from each logger is in the form of mixed binary/text files comprised of:<br /> 1) text header and footer containing recording start and end date/time, quality control and sampling configuration; and<br /> 2) sea noise data of 16 bit unsigned integer, binary values (IEEE, little endian).<br /> <br /> Instruments are calibrated for system gain with white noise of known level input with the hydrophone in series, before and after deployments. System calibrations are made over 2 Hz to the Nyquist frequency. The instrument clock drift is checked against GPS transmitted UTC time before and after deployment.<br /> <br /> The raw data can be obtained on portable disk from IMOS eMarine Information Infrastructure (eMII).<br /> <br /> The Centre for Marine Science and Technology (CMST) at Curtin University has developed Matlab software to process and analyse these data.<br /> <br /> This observatory was decommissioned early in 2018.

波特兰被动声学观测站由两到四个系泊设备组成，这些系泊设备配备有安装在海底约170米深处的水听器，用于记录海洋中的噪声。该系统可用于监测鲸鱼和鱼类的迁徙、地震活动以及其他自然和人为噪音源。如果设置四个系泊设备，则在边长为5 km的近似等边三角形的每个顶点处配置一个系泊设备，第四个系泊设备位于三角形中心。海底的每个系泊处都设置了温度记录仪。<br /> <br /> 每个记录器以6 kHz的采样率记录每15 min中的3-8 min。如果设置了四个记录器，则每天还进行一次22 kHz的记录，以使仪器时钟精确同步。这是根据声源到达阵列中每个水听器的时间来定位声源所必需的。设置在中心系泊装置上的7 kHz脉冲发射器每天一次以20 s间隔脉冲发射35分钟，以重叠22 kHz样本。<br /> <br /> 每个记录器的原始数据以混合二进制/文本文件的形式存在，包括：<br /> 1)包含记录开始和结束日期/时间、质量控制和采样配置的文本页眉和页脚;以及<br /> 2)16位无符号整数、二进制值（IEEE，小端）的海洋噪声数据。<br /> <br /> 在部署之前和之后，使用已知水平的白色噪声输入，与水听器串联，校准仪器的系统增益。系统校准在2 Hz至奈奎斯特频率范围内进行。在部署前后，根据GPS传输的UTC时间检查仪器时钟漂移。<br /> <br /> 原始数据可从IMOS eMarine Information Infrastructure（eMII）的便携式磁盘上获得。<br /> <br /> 科廷大学海洋科学和技术中心开发了Matlab软件来处理和分析这些数据。<br /> <br /> 该天文台于2018年初退役。