Method, system and device for low-noise and wide-band adaptive signal acquisition of electromagnetic wave logging while drilling

Abstract

This invention belongs to the field of oil and gas field exploration and development and logging technology, specifically involving a low-noise, wideband adaptive signal acquisition method, system, and equipment for electromagnetic wave logging while drilling. It aims to solve problems such as weak signal distortion, high power consumption in high-frequency sampling, and poor adaptability. The invention includes: receiving a wideband electromagnetic wave signal, sampling to obtain the amplitude after low-noise differential amplification, and dynamically adjusting the gain and anti-aliasing filtering; determining the delay step size and number of points for equivalent time sampling based on the signal frequency, acquiring discrete points by gradually shifting the sampling time, and reconstructing the complete waveform; and continuously adaptively adjusting the delay, number of points, and gain. This invention suppresses weak signal distortion through low-noise differential amplification and dynamic gain control, significantly reduces high-frequency sampling power consumption by combining equivalent time sampling, and adaptively adjusts parameters based on signal frequency and amplitude, significantly improving the fidelity, energy efficiency, and environmental adaptability of wideband signal acquisition in electromagnetic wave logging while drilling.

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