Using Pseudo-Random Code Sequences for Improving the Efficiency of Near-Field Transient Electromagnetic Sounding on the Arctic Shelf

Goncharov, A.A.; Alekseev, D.A.; Koshurnikov, A.V.; Gunar, A.Y.; Semiletov, I.P.; Pushkarev, P.Y.

Авторы: Goncharov A.A., Alekseev D.A., Koshurnikov A.V., Gunar A.Yu, Semiletov I.P., Pushkarev P.Yu
Журнал: Izvestiya. Physics of the Solid Earth
Номер: 5
Год издания: 2022
Издательство: Pleiades Publishing, Inc.
Местоположение издательства: New York, USA
Первая страница: 158
Последняя страница: 170
Оригинальные версии: Применение псевдослучайных кодовых последовательностей для повышения эффективности зондирования становлением поля в ближней зоне на Арктическом шельфе
DOI: 10.1134/S1069351322050020
Аннотация: Abstract—Numerical modelling was done with the aim to evaluate the efficiency of applying pseudo-random sequences of current pulses (pseudo-noise signals, PNS) in marine time-domain electromagnetic sounding (transient electromagnetic sounding (TEM)) systems with a dipole-dipole array, and to develop specialized methods for processing/interpretation of data obtained under this approach. Based on the analysis of experimental TEM sounding data collected during field studies in the Laptev Sea area, we estimated noise and distortions that obstruct the interpretation of TEM sounding signals. Using the algorithm for the generation of pseudo-random code pulse M-sequences and experimental noise records, we simulated PNS sounding signals corresponding to conditions of marine surveying on the Arctic shelf. Processing of noisy synthetic records and reconstruction of the impulse response were based on a convolution equation. Based on the results of the comparison of derived transient responses, reconstructed on the basis of noisy synthetic data in the commonly used stacking and newly proposed PNS modes, it was found that in the PNS mode the relative error of the response estimation increases with time much slower than in the stacking mode and remains within an acceptable value range (up to several percent) until later periods (the curve elongation can reach a decade in time). It is demonstrated that the implementation of the PNS mode in marine electromagnetic sounding systems considerably improves the system performance in terms of the signal/noise ratio (SNR) and expands the range of the applicability of electromagnetic sounding in the Arctic shelf setting.
Добавил в систему: Гунар Алексей Юрьевич

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Using Pseudo-Random Code Sequences for Improving the Efficiency of Near-Field Transient Electromagnetic Sounding on the Arctic Shelfстатья

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