Effective information extraction from high-order pseudo-random electromagnetic signals in urban environments:A case study of a rail transit engineering area in Jinan City,China
The spectra of high-order pseudo-random electromagnetic signals encompass all the frequencies required for exploration engi-neering,it has the characteristics of enhancing work efficiency and strong anti-interference capability,and has been applied in electro-magnetic exploration in urban environments.This study extracted effective information from high-order pseudo-random signals in the e-lectromagnetic survey conducted in areas with strong powerline interference within the special exploration area of the Phase I engineer-ing of the Jinan Urban Rail Transit Line 8.To efficiently extract high-quality effective information,an envelope assessment algorithm was combined with high-order pseudo-random signals.Specifically,the actual signal interference was accurately estimated by analyzing the spectral envelope values.This allows for screening received signals,thus further mitigating the impacts of powerline interference and its harmonics.As a result,more effective frequency and geoelectric information were obtained,providing abundant effective electromag-netic data for subsequent inversion and interpretation.The novel method serves as a technique for effective information extraction for fu-ture electromagnetic sounding in a complex urban environment.
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