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Research and Implementation of High-speed Data Transmission Technology in Telemetry Seismic Acquisition Stations

Author: WangZuo
Tutor: DengMing
School: Chinese Geology University (Beijing)
Course: Information and Communication Engineering
Keywords: Seismic acquisition station High Speed ??Data Transmission Synchronous Manchester encoding
CLC: P631.44
Type: Master's thesis
Year: 2011
Downloads: 71
Quote: 0
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Abstract

This paper study the telemetry seismic acquisition station using a single station, single-channel design, said analog detector output analog signal digitized collection station, no analog attenuation, noise is small, the user can select each acquisition chain . Acquisition station is mainly responsible for the detector data acquisition, synchronous data transfer, asynchronous data transfer, and other tasks. Digital transmission performance and synchronization performance is directly related to the acquisition system with channel capacity. Fully understand the basis of the study and research background, this paper proposed a digital transmission of high-speed low-power digital seismic acquisition stations for telemetry, and by the preliminary experimental validation. Acquisition station data transmission using Manchester coding, data transfer rate 16.384Mbps, the sender uses a 32.768MHz crystal. Independent preparation of Manchester coding procedures, data and parallel-to-serial conversion, data header add coding send in an FPGA. The receiving side uses 131.072MHz clock oversampling Manchester decoding program can identify the data header, the Manchester encoded data is converted into serial data, and then the serial data into parallel data. Similar to POE (Power Over Ethernet) power supply, just use the 4-pin cable to complete the two-way data transmission and power supply task voltage isolation and collection stations. On the basis of the data transmission, to achieve synchronous data acquisition, customized set of synchronous reset protocol. Acquisition chain of the transmission of the AC signal on the data line delay is 5.13ns / m (AC signal in the wire, the transmission speed of about 195,000 km per second), then a two thousand meters, the signal propagation delay is 10.26μs coupled with the delay on each collection station 4μs, will reach tens of milliseconds propagation delay, so that relying solely on sending synchronous acquisition command is unable to achieve high-precision synchronization acquisition. The synchronous reset agreement must also be able to respond to any change of the length of the transmission line, the synchronization process, synchronous test frame will be sent back and forth in the acquisition chain, each gathering station can sync test frames received from both directions, by calculating the after the arrival of the collection stations will be in sync acquisition command, wait for the with own position corresponding time, give acquisition module to issue acquisition command. After the actual test, you can achieve a synchronization accuracy of 200ns. Produced only data transmission relay function for data transmission performance of the test telemetry seismic data acquisition station, power station, has been tested, the data transmission performance can meet the design requirements.

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