Development Of Wireless Telemetric 48-channel High Resolution Shallow Digital Seismograph

As the main equipment for seismic exploration, seismic instrument is the core of seismic data acquisition and the key point to obtain the seismic data with high SNR, high-resolution, high-fidelity in the field. Currently wired telemetric seismograph has been widely used as mainstream equipment, and has achieved very good results in various engineering geological evaluation and exploration areas, however, along with the continuous improvement of seismic exploration technology, and more and more poor seismic exploration environment, the overall project volume and the area also expanded, making the current mainstream cable telemetric seismograph is difficult to meet this demand to a certain extent, considering these disadvantages and giving full consideration to the construction of complex terrain conditions, and further improving the construction efficiency, it makes wireless telemetric engineering seismograph to be a trend in the technical field. Based on an overall consideration of the research status in this field at home and broad, mature products has not yet emerged, so the wireless telemetric shallow seismograph has broad application prospects and market value in geophysical exploration's aspect at home and abroad.This paper combines traditional telemetric seismograph's various advantages, it adopts the thinking of distributed telemetry to imply the data acquisition system, meanwhile, caters the independent research route for acquisition station and host. The paper uses radio frequency technology to establish wireless communication network as the core, designs a multi-channel signal acquisition and processing module which can be dynamically configured and integrated programmable amplifier, high-cut and low-cut filter whose cut-off frequency is adjustable and notch filter, signal selection distribution unit, optional sampling rate and high-resolution 24-bit ADC. At the same time, it takes full advantage of ARM system hardware resources with various peripheral that loading Hard Real-Time operating system for Windows CE constitutes system host, to meet simultaneously the host's high compatibility, it designs a USB to wireless adapter to adjust various systems with PC, while develops two real-time, high efficient control software based on desktop Windows and Windows CE OS that Integrates control, collection, transmission, processing, real-time display . It accomplishes eventually a High-resolution seismic data acquisition system with wireless telemetry type, portable, low power consumption, and high synchronization precision.There are several innovations as follows: a pre-signal processing module that can be remotely configured dynamically and integrating four channels in a single board with low interference and high synchronization precision; It forms a wireless data transmission networks with strong anti-interference, real-time efficiency, transmission large number of data using nRF24L01; It designs a high-performance seismograph host and related operating software for the advantages of integrating various common peripherals of ARM9 processors; The low-power, portable design to improve further overall efficiency of seismic exploration is another great innovation for the seismic data acquisition system in this thesis.