Abstract
Because of its portability, the non-cable seismograph has become the future development trend of geophysical instruments. A new wireless data transmission device of 433 M module was proposed; a wireless network was built using the EL1663B_PA module of the SI4463 core, and through the SPI interface to modify the internal parameters. Data transmission used dual antenna mode, the main station as the center of the wireless network coverage up to 550 m or more. The wireless time synchronization system was designed to realize the wireless connection communication between the shallow seismograph and the sensor of each observation point. This program aimed to eliminate the necessary connecting cable and batteries between the conventional shallow seismograph and the detector, greatly reducing the weight of the equipment, and making the shallow seismograph truly low cost, lightweight, flexible and easy to operate and so on.
Highlights
In recent years, China has made a large number of investments in the high-speed rail, highways, airports and other infrastructure areas, which makes the shallow detection arouse more and more attention
The system is cumbersome and difficult to carry, and the total weight of all the equipment and the cable is 25 t or more in the standard seismic exploration, which directly affects the transport costs and mobility; a lot of time, manpower and resources need to be spent on the field equipment layout, and there exists the cable maintenance and downtime risk; the cost is high, and the cables and other transmission equipment need to be replaced even if they are not damaged by human or external forces after three years of use, or because of cable aging caused by data quality degradation [2] [3]
According to the data quality of different acquisition points to determine the combination ways to make data processing more convenient and flexible, which effectively solves the shortcomings of the cable seismograph, the non-cable seismograph is predicted as the development direction of the generation of seismic exploration equipment [5] [6] [7] [8]
Summary
China has made a large number of investments in the high-speed rail, highways, airports and other infrastructure areas, which makes the shallow detection arouse more and more attention. The cable acquisition technology has the advantages of speed and stable data transmission. According to the data quality of different acquisition points to determine the combination ways to make data processing more convenient and flexible, which effectively solves the shortcomings of the cable seismograph, the non-cable seismograph is predicted as the development direction of the generation of seismic exploration equipment [5] [6] [7] [8]. The non-cable seismograph is mainly transmitted through wireless communication technology [9]. There are four criteria required by wireless communication system of seismograph for shallow layers: 1) lower traffic load; 2) lower power consumption; 3) communication distance of several hundred meters; 4) simple antenna for the workstation. The effectiveness and practicability of the system were proved by the actual field test
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