Chirp sub-bottom profilers (SBP) provide centi-to-decimetre resolution, seismic data with applications for various geophysical and geological purposes. To verify the field application of imaging of a buried target with a cost-effective and easy-to-apply pseudo-3D Chirp SBP survey, we explored the buried site of an ancient wooden shipwreck off the west coast of Korea before underwater excavations. The survey was conducted using a commercial 2D Chirp SBP system with a newly devised recording system that preserved the true polarity of the chirp signal. To produce high-resolution 3D Chirp SBP data from 2D Chirp SBP datasets recorded by the novel system, an optimal data processing sequence, consisting of a first phase of 2D data processing and a second phase of 3D data processing was designed. The first, 2D phase, included the estimation of a source sweep signature, cross-correlation, and deconvolution using an inverse filter. The resulting resolution of the 2D Chirp SBP data was better than that of the enveloped data provided by the commercial acquisition system. The second phase of 3D data processing included gathering 3D datasets, redistributing of ping positions, and static correction. To improve the consistency of the seismic events and reduce the repetitive corrections (swell, tidal, tie, and residual corrections), a static correction was based on multi-beam echo sounder data. The amplitude variation near the shipwreck was clearly apparent in the time slice from the final pseudo-3D Chirp SBP dataset with a bin size of 2.0 m (crossline) × 0.6 m (inline). Through 3D rendering, the buried ancient shipwreck with dimensions of 5 m (width) × 12 m (length) × 2 m (depth) was imaged successfully.

中文翻译：

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伪3D Chirp海底剖面仪测量的应用——以韩国西海岸古木沉船遗址为例

Chirp 海底剖面仪 (SBP) 提供厘米到分米分辨率的地震数据，可用于各种地球物理和地质目的。为了通过具有成本效益且易于应用的伪 3D Chirp SBP 勘测来验证埋藏目标成像的现场应用，我们在水下挖掘之前探索了韩国西海岸附近一艘古老木制沉船的埋藏地点。该调查是使用商业 2D Chirp SBP 系统和新设计的记录系统进行的，该系统保留了线性调频信号的真实极性。为了从新系统记录的 2D Chirp SBP 数据集产生高分辨率的 3D Chirp SBP 数据，设计了一个最佳数据处理序列，包括 2D 数据处理的第一阶段和 3D 数据处理的第二阶段。第一，二维阶段，包括使用逆滤波器估计源扫描特征、互相关和去卷积。2D Chirp SBP 数据的最终分辨率优于商业采集系统提供的包络数据。3D 数据处理的第二阶段包括收集 3D 数据集、重新分配 ping 位置和静态校正。为了提高地震事件的一致性并减少重复改正（涌、潮、平和残余改正），静态改正基于多波束回声测深仪数据。沉船附近的振幅变化在来自最终伪 3D Chirp SBP 数据集的时间切片中清晰可见，其 bin 大小为 2.0 m（横线）×0.6 m（内联）。通过3D渲染，