Technology research and development for acoustic subbottom survey in deep sea

Detailed survey of acoustic subbottom is important for deep ocean geological exploration and resource exploitation. Compared to survey in shallow ocean water, deep sea survey faced some serious problems such as energy strongly attenuation, long reflection time series and large digital data size, the vertical stratigraphic resolution reduction, and low transverse space coverage. In order to resolving these problems, main instrument manufactures in the world adopted different possible methods. For example, resampling long reflection time series can decrease the data size, but it strongly reduce vertical stratigraphic resolution. Taking MultiPing technology can solve the transverse space coverage well, but its variable depth range acquisition by seafloor reflection tracking will cause serious jumping off in reflection events, or it cannot get the correct seafloor reflection depth by acquisition with MultiPing transmitting interval. This study further independently developed some related technologies, and correctly solved the reflection events jumping off, and got the recording time delay in computing the deep seafloor depth. All these technologies obtained in the present study will provide some technical support for future acoustic subbottom detailed survey in deep sea.