Seismic communication might promise to revolutionize the theory of seismic waves. However, one of the greatest challenges to its widespread adoption is the difficulty of signal extraction because the seismic waves in the vibration environments, such as seas, streets, city centers and subways, are very complex. Here, we employ segmented correlation technology with Morse code (SCTMC), which extracts the target signal by cutting the collected data into a series of segments and makes these segments cross-correlate with the decoded signal to process the collected data. To test the effectiveness of the technology, a seismic communication system composed of vibroseis sources and geophones was built in an environment full of other vibration signals. Most notably, it improves the signal-to-noise ratio (SNR), extending the relay distance and suppressing other vibration signals by using technology to deal with seismic data generated by the system.
Abstract:A high resolution digital integrated chip capacitor measurement system was designed.The major components of the system mainly includedmain control chip, capacitance transducer, data storage and communication interface.ARM7-based mcro controllerSTM32F207was used as the main control chip, capacitance measurement chip AD7747produced by AD Company with sensitivity can be up to 20 af was used as capacitance transducer. The capacitance measurement range ofAD7747 is -8 pf to +8pf, the maximum common-mode immutable capacitance can reach17 pf anddata update rate range is between 5 Hz to 45 Hz. The absolute error of test circuit was calculated by the fixed capacity test and error analysis. The final results were obtained after subtracting the absolute error, and the final test error is less than 3%.
Application fields of broadband seismometer determine that the settlements of the most instruments locate in remote areas in the wild. Especially as the broadband seismometers of scientific exploration networks and mobility observatory arrays are often unattended, and the field inspections of instruments require a lot of manpower and material costs. To solve these problems, we proposed and designed a remote condition monitoring method of broadband seismometer which bases on the mobile Internet. By SMS (Short Messaging Service) and e-mail in two ways, we have achieved remote status monitoring of broadband seismometer. It provided a solution for monitoring of broadband seismometer which located in remote areas in the wild.
Abstract. Phase-sensitive detection circuit tests signals according to the correlation of the reference signal and the input signal. The noise is eliminated by the independence between the reference signal and the noise signal. The sensitivity of the detector is improved significantly by the suppression of the noise. In this work, a phase-sensitive detection circuit is designed for seismometer, which possesses the characteristics of low-input noise, variable-output gain and high sensitivity. The feasibility of this phase-sensitive detection circuit is verified by the Multisim and the signal-to-noise ratio is satisfactory.
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