Method of reducing impulsive noise in electromagnetic geophysica

Details Method of reducing impulsive noise in electromagnetic geophysica Method of reducing impulsive noise in electromagnetic geophysica

1989-08-14

1990-07-31

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

324347, G01V 300

Patent

active

049453092

ABSTRACT:
A method for reducing impulsive noise in electromagnetic geophysical data utilizes a receiving antenna and one or more noise sensors. The type of noise sensor used depends on the type of impulsive noise which is to be monitored. Motion noise is monitored with a tilt meter or similar motion sensor. Impulsive electromagnetic noise is monitored with an electric or magnetic field sensor which is located so as to receive impulsive noise while minimizing the reception of the electromagnetic signal of interest. Impulsive noise is monitored without the electromagnetic signal of interest for a short period of time to enable the determination of a threshold noise value. Then, the impulsive noise is monitored simultaneously with the electromagnetic signal of interest, wherein the impulsive noise is received by the noise sensor and the signal of interest is received by the receiving antenna. The output of the noise sensor is used to determine the occurrence of impulsive noise in the output of the receiving antenna, wherein the impulsive noise portion of the signal record can be deleted.

REFERENCES:
patent: 4247821 (1981-01-01), Buselli
patent: 4339720 (1982-07-01), Halverson
patent: 4812766 (1989-03-01), Klien
Nichols, Morrison, and Clarke, "Signals and Noise in Magnetotellurics", Society of Exploration Geophysicists, Fifty-Fifth Annual International Meeting and Exposition, 1985.

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