| As the accuracy of seismic acquisition technology continues to enhance,seismic exploration data is also increasing,and the requirements for seismic data transmission are getting higher and higher.Traditional seismic acquisition systems rely on cables for data transmission,but they bear high maintenance and logistics costs.With the advancement of communication technology,the reliability of wireless transmission has been greatly developed,gradually replacing the traditional cable transmission.The emerging wireless transmission is mainly through the networking of acquisition stations and base stations to conduct real-time transmission of seismic data.This kind of technology is difficult and requires professionals to create the base station.Once a failure occurs,the transmission system can be paralyzed,and There are difficulties in daily maintenance.In response to these problems,this article combines the popular wireless sensor network technology and redesigns the wireless hardware structure of the acquisition station node on the basis of the cable-free seismograph of Jilin University,and proposes a routing protocol suitable for seismic data transmission.This design carries out the hardware design of the wireless transmission mainboard for the wireless seismic acquisition node.Wireless mainboard hardware system consists of a wireless transmission circuit and an external antenna.The wireless transmission circuit is comprised of an embedded radio frequency control chip QCA9563 and a highly integrated four-port Gigabit Ethernet.Network switches QCA8337 N,network transformer G2401 S,switch control circuit,and 2.4GHz radio frequency circuit.The data to QCA9563 of the wireless transmission circuit through the Ethernet unit.QCA9563 processes all the data and uses the SPI interface to The switch chip is controlled,and the data is distributed at high speed through the GMII interface.The design of the wireless motherboard hardware realizes the multi-hop transmission of seismic data.An adaptive load balancing routing protocol is proposed.The protocol targets the congestion and energy of the seismic data transmission path and constructs a path cost evaluation function model.By calculating the evaluation function of each path,an optimal path is chosen.As a data transmission path,the route is kept at regular intervals,and the path information is updated by periodic broadcast of HELLO packets.If a more suitable path is detected,a more suitable path is chosen for data transmission.As the network resources change,the most suitable transmission path is chosen for the transmission of seismic data at any time,and the simulation compares with the current type protocol to ensure the feasibility of the protocol.Built on the design of software and hardware,the wireless part of the hardware is tested.The RF output power is 27 d Bm,and the fluctuation is within 2d Bm;the center frequency fluctuation range is ±20ppm;the receiving sensitivity is less than-65 d Bm;the maximum receiving level Greater than-20 d Bm;the maximum power consumption is 5.6W,and the indicators are all within the expected range.A seismic wireless transmission system networking test was also carried out.In this process,a seismic data transmission system was built and the networking scheme was verified.It was measured that the transmission rate of each node was 410kbit/s,and the average throughput of the system was about 12MB/s,system data delay averages about 370 ms,and the system average packet loss rate is about 7%,all in line with the expected target.This design can meet various requirements such as real-time seismic data monitoring.The newly constructed seismic data transmission system overcomes the difficulty of the original base station installation,which improves the portability of the entire system and makes the network efficient and fast. |
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