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Effect of bird maneuver on frequency-domain helicopter EM response

David V. Fitterman and Changchun Yin
Effect of bird maneuver on frequency-domain helicopter EM response
Geophysics (September 2004) 69 (5): 1203-1215

Abstract

Bird maneuver, the rotation of the coil-carrying instrument pod used for frequency-domain helicopter electromagnetic surveys, changes the nominal geometric relationship between the bird-coil system and the ground. These changes affect electromagnetic coupling and can introduce errors in helicopter electromagnetic (HEM) data. We analyze these effects for a layered half-space for three coil configurations: vertical coaxial, vertical coplanar, and horizontal coplanar. Maneuver effect is shown to have two components: one that is purely geometric and another that is inductive in nature. The geometric component is significantly larger. A correction procedure is developed using an iterative approach that uses standard HEM inversion routines. The maneuver effect correction reduces inversion misfit error and produces laterally smoother cross sections than obtained from uncorrected data.


ISSN: 0016-8033
EISSN: 1942-2156
Serial Title: Geophysics
Serial Volume: 69
Serial Issue: 5
Title: Effect of bird maneuver on frequency-domain helicopter EM response
Affiliation: U. S. Geological Survey, Denver, CO, United States
Pages: 1203-1215
Published: 200409
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 14
Accession Number: 2005-022438
Categories: Economic geology, general, depositsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N31°45'00" - N31°45'00", W106°30'00" - W106°30'00"
Secondary Affiliation: Fugro Airborne Surveys, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 200511
Program Name: USGSOPNon-USGS publications with USGS authors
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