KEYWORDS: Wavelets, Signal processing, Wavelet transforms, Data acquisition, Signal to noise ratio, Denoising, Signal detection, Sensors, Filtering (signal processing), Detection and tracking algorithms
Grating digital geophone is designed based on grating measurement technique benefiting averaging-error
effect and wide dynamic range to improve weak signal detected precision. This paper introduced the principle
of grating digital geophone and its post signal processing system. The signal acquisition circuit use Atmega 32
chip as core part and display the waveform on the Labwindows through the RS232 data link. Wavelet
transform is adopted this paper to filter the grating digital geophone' output signal since the signal is unstable.
This data processing method is compared with the FIR filter that widespread use in current domestic. The
result indicates that the wavelet algorithm has more advantages and the SNR of seismic signal improve
obviously.
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