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Seafloor observatories can provide long-term, real-time submarine monitoring data, which has great significance for the study of major scientific technology in marine science, especially in the seafloor earthquake observation. The chained submarine data sampling and transmission system is the prototype and foundation of cabled seafloor earthquake o...
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... components of the hardware circuit of each node are divided into three parts: the control part (primary device), the data sampling part (secondary device), and the clock synchronization part (secondary device). The components of each part are shown in Table 1. In each node, the control part is responsible for receiving and fusing the data uploaded by each secondary device; the data sampling part is responsible for sampling submarine data; the clock synchronization part is responsible for synchronizing with the master clock and providing time stamp. ...Citations
... In our previous work, we proposed a prototypical chained data acquisition and transmission system [22]. Through prototype validation, we successfully demonstrated the feasibility of its mechanisms, including clock synchronization and link transmission. ...
Citation: Fang, J.; Liu, W.; Qiao, J.; Lv, L.; Zhu, W.; Zhang, X. Dual-Link Synchronous Acquisition and Transmission System for Cabled Seafloor Earthquake Observatory. Abstract: Seafloor observatories play a crucial role in acquiring continuous and precise submarine monitoring data, thereby holding significant implications for advancing major scientific advancements in marine science, particularly in the field of seafloor earthquake observation. This work mainly builds a dual-link observation system designed for observing seismic information on the seafloor based on a Zynq7000 system-on-chip and time synchronization module. The system is based on Zynq7000 SoC(MILIANKE; Changzhou, China) and AD7768(Analog Devices, Inc.; Norwood, MA, USA) to achieve eight-channel data (24 bit) synchronous acquisition, and the robustness of the system is improved by upgrading the link to full-duplex transmission and adding node data self-storage function. The P88 1588 PTP time synchronization single board(CoolShark; Beijing, China) is used to provide PPS (Pulse per second) signals for the system to realize microsecond timestamps to support subsequent seismic data inversion. An upper computer system based on the Qt framework is also developed to monitor the network condition in real time while visualizing the data transmission. For the acquisition of seismic signals, we employed triaxial seismic sensors. Additionally, a temperature and humidity monitoring module, along with an attitude detection module, was designed to enable real-time monitoring of the nodes. These modules not only facilitate the real-time monitoring of the nodes but also contribute to seismic data inversion. The experimental results indicate that the system provides a good synchronization of data acquisition, high accuracy, and reliability of inter-node transmission, which has good application prospects.
