Data transfer node for geophysical exploration

Abstract

The invention belongs to the field of geophysical exploration, and provides (1) a long-distance transmission node; (2) reduces the overhead of the internal transmission line of the seismic exploration array system; (3) provides a data transmission node for geophysical exploration ; (4) Provide a general long-distance data transmission node for geophysical exploration with an adjustable or adaptive serial data transmission rate between nodes between 50Kbps-300Mbps. For this reason, the technical scheme that the present invention adopts is that the data transmission node of geophysical exploration is made up of uplink path, downlink path, acquisition module transmission interface; It consists of a level matching network, a clock / data restorer, a first command transponder, a second level matching network, an NRZI / MLT-3 encoder, and a second transformer. The invention is mainly applied to geophysical exploration.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a data transmission node for geophysical exploration. technical background [0002] The seismic exploration array system is widely used in engineering exploration, oil exploration, seabed geological structure exploration, marine fish density observation, etc. Currently, the mainstream seismic exploration systems on the market mainly include the 408UL system of the French SERCEL company and the SeaMUX of the American HTI company. Digital Array system, etc. Since the transmission distance is inversely proportional to the data bandwidth on the transmission line, these systems have the disadvantage that the transmission distance is not far when data transmission is performed between data transmission nodes (hereinafter referred to as nodes); Under the condition of cable section, they need more nodes for data relay transmission, and more nodes will not only bring gr...

AI Technical Summary

Problems solved by technology

Since the transmission distance is inversely proportional to the data bandwidth on the transmission line, these systems have the disadvantage that the transmission distance is not far when data transmission is performed between data transmission nodes (hereinafter referred to as nodes); Under the conditions of cable sections, they need more nodes for data relay transmission, and more nodes will not only bring greater costs, but also reduce the reliability of the entire system

Furthermore, the nodes of the 408UL system of the French SERCEL company use HDB3 encoding for data transmission. This encoding method can make the serial data stream have more timing information, so that the data receiving end can extract the bit synchronization clock. , however, the HDB3 encoding method does not reduce the bandwidth of the data stream on the transmission line, so this encoding method limits the transmission distance between nodes to a certain extent

At the same time, the nodes of the SeaMUX Digital Array system of HTI Company in the United States use Manchester encoding for data transmission. This encoding method is to increase the transmission bandwidth of the data on the transmission line to facilitate the data receiving end to extract the bit-synchronous clock. Its The encoding efficiency is only 50%. Therefore, this encoding method not only does not reduce the data transmission bandwidth on the transmission line, but also increases the data transmission bandwidth, which seriously affects the data transmission distance between nodes.

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