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《Chinese Journal of Geophysics》 2013-11
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Key techniques of wireless telemetry digital seismograph

LI Huai-Liang;TUO Xian-Guo;LIU Ming-Zhe;Key Subject Laboratory of National Defense for Nuclear Waste and Environmental Safety (Southwest University of Science and Technology);State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology);  
A portable wireless telemetry shallow digital seismograph which is completely independently developed is introduced in this paper.It takes wireless ad hoc network as the core of the system,based on double ARM and FPGA platforms.The multi-function IP soft core driver mode and embedded operating system are adopted to improve the integration level and to reduce the size of the equipment in the aspect of hardware.A dynamic and configurable signal conditioning unit is designed to ensure the dynamic range and fidelity of the system.And the technology of parallel double buffer including the circulation pre-acquisition and storage is applied to realize strictly multichannel parallel acquisition under the condition of uncertain transmission delay.This paper analyzes wireless radio and wireless Ethernet in details,which is suitable for seismic data transmission,and the corresponding networking scheme and key technical difficulties.The problems of acquisition synchronization and non-uniform sampling to distributed wireless signal acquisition station are solved.Twelve parallel acquisition channels are integratedto each signal acquisition station,which can reach 18-bit resolution with a 4ksampling rate,and its parameters can be configured remotely.The field quality control function is integrated in the software that is suitable for engineering exploration in complicated environments.The size and weight of this equipment are reduced,and the complexity of construction layout is decreased since various additional accessories are removed.In doing so,the environmental adaptability and exploration efficiency of the equipment are greatly improved.
【Fund】: 国家杰出青年科学基金(41025015);; 国家自然科学基金重大科研仪器设备研制专项(41227802)资助
【CateGory Index】: P631.43
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