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Modeling and simulation of digital sensor in seismic exploration based on SIMULINK

Seismic exploration imposes strict requirements on digital sensor such as large dynamic range and high linearity. Criterions for selecting mechanical parameters of digital sensor are presented for acceptable Brownian noise. System signal and noise transfer functions are then introduced based on high order σ-Δ modulation. It is revealed that 5th order σ-Δ modulation is required to suppress the quantization noise to negligible level. To point against the requirement to THD (total harmonic distortion), the formulas for THD calculation is derived, constraints to electronics parameters for THD that less than −100dB is calculated by these formulas. Modeling and simulation of the whole system are carried out, results are inspected and verified with theoretical analysis.