EFFICIENT COMPUTATIONAL METHOD FOR TRANSIENT EM RESPONSE OF LARGE-LOOP SOURCE OVER LAYERED EARTH

(整期优先)网络出版时间:2014-03-13
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CalculationsoftheElectroMagnetic(EM)responseproducedbyalargehorizontalloopplacedoverlayeredmediumarerathercomplexbecauseitsintegralexpressioncontainstheproductoftwoBesselfunctionsandhasapergentterm.Inthispaper,animprovedfastHankelandGaver-Stehfesttransformsareintroducedtosolvethestrong-oscillationandslow-decaypropertiesoftheintegrand,whereoneBesselfunctionintheproductissubstitutedbyacarefullychosenpolynomialofhighaccuracyandtheotherusedasthedigitalfiltercoefficientsintheconvolutionintegral.Comparisonsprovethevalidityandtheefficiencyoftheproposedmethod.