Application of powerline noise cancellation method in correlation identification of controlled source electromagnetic method

Abstract Powerline interference in the controlled source electromagnetic method has traditionally been one of biggest conundrums plaguing geophysicists, and its conventional denoising methods primarily include filtering noise estimation. The filter leaches at specific frequency points, which might also useful signals; estimation significantly eliminates interference, whereas premise is that stable after a short time recorder necessary field. In present study, using periodicity symmetry powerline noise, we propose subtraction an addition for cancellation noise. First, transmitted signal optimized so equivalent m sequence; then response processed by method; subsequently, correlation identification applied finally, solve earth impulse means Wiener deconvolution method. Simulation experiments field data tests demonstrate can be well suppressed proposed system accuracy greatly improved. simple principle effective removing presents novel perspective on elimination identification.