A high dynamic range seismic signal classification acquisition method and system

Abstract

The invention relates to a high dynamic range seismic signal graded collection method and system. The method comprises the steps that 1, grades into which input signals need to be divided are determined, the high-dynamic-range seismic simulation input signals to be collected are divided into multi-path input signals of corresponding grades, and each path of input signal is matched with a path of 24-bit analog-digital converter; 2, over-voltage protection, amplitude matching and electrical level shifting are carried out on all paths of input signals in sequence, the amplitude range of the input signals is made to be completely matched with the conversion ranges of the corresponding analog-digital converters, and the input signals are converted to be 24-bit digital output signals through the analog-digital converters; 3, all paths of digital output signals are read, processed and then combined, and then final conversion results of a 32-bit binary system data format are obtained. Each module function of the system corresponds to the technical scheme of the method one to one. According to the high dynamic range seismic signal graded collection method and system, a seismic data collector can collect seismic signals of large amplitude, is not prone to amplitude limiting, and can also have higher resolution ration on small signals.

Description

technical field [0001] The invention relates to the technical field of seismic signal digitization, in particular to a hierarchical acquisition method and system for high dynamic range seismic signals. Background technique [0002] Seismic data acquisition system is an essential part of seismic signal digitization, its performance is directly related to the quality of the final seismic signal, and will affect the data processing results. The signal amplitude span of seismic observation is very large, that is, it is a signal with a high dynamic range: for example, in seismic observation, it is necessary to receive weak earthquakes, nuclear earthquake signals, ground pulsations, and earth background noise from thousands of kilometers away. Signal, and near-field monitoring of large earthquakes above magnitude 8, the total dynamic range is even as high as 160dB or more. At present, the noise level of the broadband seismometer is less than 2μV, and the maximum output amplitude ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method and system for hierarchically collecting high dynamic range seismic signals, which are used to solve the problem that the signal amplitude span of seismic observation is large and the dynamic range of the broadband seismometer output signal is high, and solve the problem of The 24-bit seismic data collector has problems such as low resolution for small signals, low signal-to-noise ratio, insufficient tolerance for large signals, and prone to large signal clipping.

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