A technique for estimating the absolute vector geomagnetic field from a marine vessel

The Lake Bosumtwi meteorite impact structure, Ghana—A magnetic image from a third observational level

“…Early works by Levanto focus on the use of vector magnetics in a borehole situation (Levanto 1959(Levanto , 1963. More recently, Korenaga (1995) demonstrated how it is possible to use a comparison of vector magnetic components to differentiate between 2-D and 3-D magnetic sources; Lesur et al (2004) reported initial tests of a marine vector magnetic system capable of estimating the absolute strength and direction of the geomagnetic field.…”

Confidence Limits Associated With Values of the Earth's Magnetic Field Used for Directional Drilling

“…However, at sea this is a much greater challenge because of the difficulties in establishing azimuth of a vector magnetometer system on a moving survey platform and of removing the magnetic effect of that platform. However, using a combination of gyros, GPS, and accelerometers for attitude determination and performing 360° turns at locations where the magnetic field strength is already known, the accurate estimation of the magnetic field vector at sea has been shown to be feasible (Lesur et al 2004). …”

Misalignment calibration of geomagnetic vector measurement system using parallelepiped frame rotation method

“…It can be seen from equation (2) and (4) In the rotation process, the relationship between the magnetic field projection on nonmagnetic parallelepiped frame coordinate Z axis and magnetometer measured value can be expressed as: 13 23 33…”

“…Providing that the attitude information of three axis magnetometer is known, the magnetic field components on local geography coordinate can be known: north magnetic field, vertical magnetic field, east magnetic field [12][13][14][15]. One key factor influencing the measurement result of geomagnetic measurement system is the attitude measurement accuracy.…”