RV Investigator Voyage IN2023_T01 SBP120 Sub-bottom Profiler Data

This record describes sub bottom profiler data collected on RV Investigator voyage IN2023_T01, titled 'Transit + Opportunistic Mapping + XBT AutoLauncher'. The primary objective of voyage IN2023_T01 is the safe and timely transit of RV Investigator from Sydney to Hobart in preparation for future voyages leaving the port of Hobart. The transit is direct with no operational time available for science operations unless underway at full speed. Any available operational time to be spent on opportunistic seafloor mapping – while keeping Expected Time of Arrival in Hobart on track as the primary objective. The voyage took place between November 2, 2023 and November 5, 2023 (AEST), departing from Sydney and returning to Hobart.

The Kongsberg SBP120 (sub bottom profiler) was used to acquire data containing the specular reflections at different sediment interfaces below the seafloor. The SBP120 provides a 3° by 3° angular resolution.

The echosounder's frequency sweep range is from 2.5 to 7 kHz. The SBP120 was logged continuously for the extent of the voyage.

Data are stored in *.raw (311 files 7.01 GB) raw and *.seg (307 files 6.93 GB) segy formats at CSIRO.

The segy format data had a real time processing stream applied, which applies gain, a gain correction, matched filter with replica shaping, an attribute calculation for instantaneous amplitude and time variable gain.

Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request

本记录描述的是“调查者号”（RV Investigator）科考船IN2023_T01航次采集的海底剖面仪数据，航次主题为“过境+机会性海底测绘+XBT自动投放系统”。IN2023_T01航次的核心目标为安全、准时将“调查者号”从悉尼航行至霍巴特，为后续从霍巴特港出发的科考航次做好准备。本次过境为直航，除非处于全速航行状态，否则无可用作业时间开展科学科考活动。剩余可调度的作业时间将用于开展机会性海底测绘，同时需确保抵达霍巴特的预计到达时间符合既定计划，此为航次首要目标。本航次执行时间为2023年11月2日至2023年11月5日（澳大利亚东部标准时间，AEST），起航港为悉尼，终到港为霍巴特。

本航次使用康士伯SBP120型海底剖面仪（sub bottom profiler）采集数据，该设备可获取海底下方不同沉积界面的镜面反射信号。SBP120的角分辨率为3°×3°。

该回声测深仪的扫频范围为2.5 kHz至7 kHz。SBP120在整个航次期间均处于连续记录状态。

数据以两种格式存储于CSIRO：*.raw格式（311个文件，总容量7.01 GB）与*.seg格式（即SEG-Y格式，307个文件，总容量6.93 GB）。

SEG-Y格式数据经过实时处理流处理，处理流程包含增益校正、带副本整形的匹配滤波、瞬时振幅属性计算以及时变增益处理。

有关本数据集的更多信息可查阅《GSM数据采集与处理报告》。如需获取额外数据产品，可提出申请。