An application of system identiﬁcation techniques to impedance estimation in magnetotelluric surveying

Ugryumova, Diana and Lau, Katrina and Braslavsky, Julia and Meinsma, Gjerrit (2009) An application of system identiﬁcation techniques to impedance estimation in magnetotelluric surveying. In: 15th IFAC Symposium on System Identification 2009, 6-8 July 2009, Saint-Malo, France.

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Abstract:	Magnetotelluric (MT) surveying is an Electromagnetic (EM) surveying technique used in geophysics and mineral exploration. The main problem in MT surveying is the estimation of the impedance of the ground, which is obtained as the ratio between the natural environmental electric and magnetic ﬁelds measured on the surface of the target area. Because these measurements are inherently corrupted by noise, the impedance estimate may be biased (Errors-In-Variables (EIV)), which is a difﬁculty well-known in MT literature and typically overcome by the use of additional independent measurements. This paper formulates the MT problem as a standard system identiﬁcation problem, and uses output-error model structures to obtain scalar (SISO) and vector (TISO) ground impedance estimates. Estimation bias is minimised by selecting segments of data with high Signal-to-Noise Ratio (SNR). The SISO and TISO modelling approaches are discussed and compared on results obtained from experimental MT data.
Item Type:	Conference or Workshop Item
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Mathematical Systems and Control Theory (MSCT)
Link to this item:	http://purl.utwente.nl/publications/69932
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