High-resolution multi-channel seismic exploration data transmission system at shallow layer of deepwater

Abstract

The invention relates to a high-resolution multi-channel seismic exploration data transmission system at shallow layers of deepwater, which comprises a host, a quality control machine, a data exchange board, a primary digital packet, a secondary digital packet, a tail-end digital packet, a corresponding downlink command channel and a corresponding uplink data channel. The transmission system is characterized in that a repeater is arranged between the primary digital packet and the host; each digital packet the distance from which to the host is less than 150m transmits data to the data exchange board through LVDS, and then transmits the data to the host through a CPCI bus; and each digital packet the distance from which to the host is more than 150m transmits data to the repeater to finish data relaying, then transmits the data to the data exchange board through an LRH-PHY5802 bus, and finally transmits the data to the host through the CPCI bus. The data transmission system solves the problems that the transmission system is unstable and unreliable and can not work for long time during the data acquisition, transmission and pretreatment process in case of multiple channels and unequal distance.

Description

technical field [0001] The invention belongs to the field of marine geophysical exploration, and in particular relates to a deep-water shallow-layer high-resolution multi-channel seismic exploration data transmission system. Background technique [0002] In order to avoid the attenuation caused by the long-distance transmission of the reflected wave signal when the offshore multi-channel seismic exploration system performs multi-channel exploration operations, it has to use the method of directly converting the signal into data through digital packets and then transmitting it. However, when performing shallow high-resolution multi-channel seismic exploration, due to the small interval between excitation sources and high sampling rate, a large amount of data is formed. The distance between the host computer and the first acquisition digital package is far greater than the distance between two digital packages, resulting in an unstable transmission system, thereby affecting th...

AI Technical Summary

Problems solved by technology

However, when performing shallow high-resolution multi-channel seismic exploration, due to the small interval between excitation sources and high sampling rate, a large amount of data is formed. The distance between the host and the first acquisition digital package is far greater than the distance between two digital packages, resulting in an unstable transmission system, which affects the real-time data acquisition of multi-channel earthquakes, and in severe cases, even makes real-time data acquisition impossible

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