Linear filtering of VLF dip‐angle measurements
M Karous, SE Hjelt - Geophysical prospecting, 1983 - earthdoc.org
The suggested interpretation technique is based on discrete linear filtering of VLF data. The
output of the described filtering results is expressed in terms of an equivalent current density …
output of the described filtering results is expressed in terms of an equivalent current density …
New digital linear filters for Hankel J0 and J1 transforms [link]
D Guptasarma, B Singh - Geophysical prospecting, 1997 - earthdoc.org
The numerical evaluation of certain integral transforms is required for the interpretation of
some geophysical exploration data. Digital linear filter operators are widely used for carrying …
some geophysical exploration data. Digital linear filter operators are widely used for carrying …
Geological mapping using VLF radio fields
JD McNeill, VF Labson - 1991 - pubs.geoscienceworld.org
The fact that electrical properties of the ground affect the behavior of radio waves has been
known for years. Indeed measurements of the conductivity and dielectric constant of the …
known for years. Indeed measurements of the conductivity and dielectric constant of the …
[PDF][PDF] Fast hankel transforms
HK Johansen, K Sørensen - Geophysical Prospecting, 1979 - hgg.geo.au.dk
FAST HANKEL TRANSFORMS Page 1 FAST HANKEL TRANSFORMS * BY HK
JOHANSEN ** and K. S0RENSEN *** ABSTRACT JOHANSEN, HK, and SORENSEN, K …
JOHANSEN ** and K. S0RENSEN *** ABSTRACT JOHANSEN, HK, and SORENSEN, K …
OPTIMIZED FAST HANKEL TRANSFORM FILTERS1
NB Christensen - Geophysical prospecting, 1990 - Wiley Online Library
In the linear digital filter theory for calculation of Hankel transforms it is possible to find
explicit series expansions for the filter coefficients. A method is presented for optimizing the …
explicit series expansions for the filter coefficients. A method is presented for optimizing the …
Airborne electromagnetic methods
GJ Palacky, GF West - 1991 - pubs.geoscienceworld.org
After the end of World War II, the reconstruction of war-ravaged economies fueled a great
demand for natural resources. The emerging Cold War caused explorationists to seek …
demand for natural resources. The emerging Cold War caused explorationists to seek …
A joint inversion algorithm to process geoelectric and sutface wave seismic data. Part I: basic ideas1
For the exploration of near‐surface structures, seismic and geoelectric methods are often
applied. Usually, these two types of method give, independently of each other, a sufficiently …
applied. Usually, these two types of method give, independently of each other, a sufficiently …
Hankel transform filters for dipole antenna radiation in a conductive medium
FN Kong - Geophysical prospecting, 2007 - earthdoc.org
We discuss the Hankel transforms related to a particular application, ie the dipole antenna
radiation in conductive media, such as the antenna radiation in sea‐bed electromagnetic …
radiation in conductive media, such as the antenna radiation in sea‐bed electromagnetic …
Calibration of frequency‐domain electromagnetic devices used in near‐surface surveying
J Thiesson, P Kessouri, C Schamper… - Near Surface …, 2014 - earthdoc.org
For the past forty years electromagnetic prospecting instruments have played a growing role
in the mapping of soil EM properties in the very low‐frequency (VLF) range for a large …
in the mapping of soil EM properties in the very low‐frequency (VLF) range for a large …
Inversion of multi-frequency electromagnetic induction data for 3D characterization of hydraulic conductivity
TR Brosten, FD Day-Lewis, GM Schultz… - Journal of Applied …, 2011 - Elsevier
Electromagnetic induction (EMI) instruments provide rapid, noninvasive, and spatially dense
data for characterization of soil and groundwater properties. Data from multi-frequency EMI …
data for characterization of soil and groundwater properties. Data from multi-frequency EMI …