Long-distance wire data transmission device with adjustable transmission rate as needed

Abstract

The invention belongs to the field of geophysical exploration. (1) A general transmission method is provided, wherein transmission rate between collection nodes can be adjusted in an optimal mode according to the actual application requirements; (2), the transmission technology is provided, wherein the encoding efficiency is higher and the transmission bandwidth is lower; (3), a device which can achieve longer-distance data reliable transmission can be achieved under the situation of the same effective data transmission. According to the technical scheme, the long-distance wire data transmission device with the adjustable transmission rate as needed is composed of a data receiving interface, a data receiving and forwarding module and a data sending interface, wherein the data receiving interface is mainly composed of a transformer, an MLT-3 / NRZI decoder, an interface level matching network, a clock and data recovery, an NRZI / NRZ decoder, a staticizer and an 8B / 10B decoder. The device is mainly applied to the geophysical exploration.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, in particular, relates to a long-distance wired data transmission device whose transmission rate can be adjusted as required. technical background [0002] The array detection system is widely used in sonar, seismic exploration, engineering exploration, etc.; the acquisition nodes in the array detection system are distributed in the linear streamer in a chain structure. On the one hand, the collection node is responsible for converting the analog detection signal into detection data, and on the other hand, it is responsible for transmitting the detection data to the upper-level collection node in a relay manner. [0003] On the one hand, the number of acquisition nodes in the array detection system is closely related to the reliability of the array detection system; assuming that the bit error rate of data transmission between the acquisition nodes is constant and the length of the signal d...

AI Technical Summary

Problems solved by technology

If the Ethernet physical layer interface chip is directly used in the data transmission between the nodes of the array detection system, there will be the following disadvantages: (1) the transmission rate of the Ethernet interface chip is only 10Mbps and 100Mbps. At a transmission rate of 10Mbps, the Ethernet interface chip is fixed to the Manchester coding method, and the coding efficiency of this coding method is only 50%, which greatly reduces the data transmission efficiency and transmission distance; (2) In general small-scale engineering exploration systems, acquisition The transmission rate between nodes may be lower than 10Mbps. For example, the transmission rate between acquisition nodes in HTI’s SeaMUX Digital Array system is only 4.096Mbps. If the 10Mbps rate of the Ethernet interface chip is used to transmit data lower than the required rate of 10Mbps If so, the data transmission distance is bound to be limited, because the transmission distance is inversely proportional to the transmission rate; (3) In a general large-scale seismic exploration system or sonar detection system, the transmission rate between acquisition nodes may only need tens of megabits per second If the 100Mbps rate of the Ethernet interface chip is used to transmit data lower than the 100Mbps rate requirement, the transmission distance of the data will be limited, because the transmission distance is inversely proportional to the transmission rate; (4) general super In large-scale seismic exploration systems or sonar detection systems, the transmission rate between acquisition nodes may exceed 100Mbps. If the 100Mbps rate of the Ethernet interface chip is used for transmission, the rate cannot meet the requirements; (5) Based on the Ethernet interface chip The maximum transmission distance is 100 meters. When the transmission distance between collection nodes exceeds 100 meters, the Ethernet interface chip will not be used

[0006] In the last aspect, the mainstream seismic exploration and engineering exploration systems on the market, that is, the acquisition nodes of HTI’s SeaMUX Digital Array system adopt the method of synchronous transmission for data transmission, and adopt the Manchester encoding method with only 50% encoding efficiency; The coding efficiency is low, so in order to increase the transmission distance, it can only further reduce the transmission rate to ensure the transmission bit error rate requirements. At the same time, in order to meet the overall transmission rate requirements, it must use multiple parallel paths for data transmission. This not only increases the hardware cost of the system, but also reduces the reliability of the system.

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