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Ground-vehicle INS/GPS vector gravimetry

Xiaopeng Li and Christopher Jekeli
Ground-vehicle INS/GPS vector gravimetry
Geophysics (March 2008) 73 (2): I1-I10


For geophysical purposes, gravity is measured in many ways, from static-point observations, using a gravimeter, to mean-value determinations from gravimeter and gravity gradiometer data collected by airplanes, ships, and satellites. We tested estimates of vertical and horizontal components of the gravity vector by combining Global Positioning System (GPS) data with a Honeywell H764G inertial navigation system (INS) on a land vehicle traversing highways in southwestern Montana. The estimation methods were based on techniques applied successfully to airborne INS/GPS data. In addition, we used wavelet denoising and wavenumber correlation procedures to enhance the estimates. Analyses of multiple traverses along the roads verified levels of repeatability as good as 0.64 mGal (all numerical accuracy values refer to standard deviations) in the vertical gravity-disturbance component. Control data, interpolated onto each road segment from an available database of gravity values, had an accuracy better than 2-4 mGal. Compared with this interpolated control, our vertical gravity estimates compare as well as 2-3 mGal. Resolution of the estimated vertical component is about 2.2 km, based on 180-s data smoothing and a vehicle averaging about 90 km/hr. Large scale-factor errors exist in the horizontal gravity estimates. Removing those on the basis of extensive deflection-of-the-vertical (DOV) control yields repeatability in the horizontal components of 2-15 mGal and agreement with the control at 5-9 mGal. Our tests confirm that a land-vehicle INS/GPS system is capable of along-track gravity mapping with precision and resolution that have used in local geophysical modeling (e.g., continental rifts) as well as in mineral exploration.

ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 73
Serial Issue: 2
Title: Ground-vehicle INS/GPS vector gravimetry
Affiliation: Ohio State University, School of Earth Sciences, Columbus, OH, United States
Pages: I1-I10
Published: 200803
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 26
Accession Number: 2008-080654
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
N46°00'00" - N46°30'00", W114°00'00" - W113°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 200823
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