METHOD AND SYSTEM FOR MEASURING TOTAL EARTH'S MAGNETIC FIELD FOR OCEAN MAGNETIC SURVEY THROUGH ELIMINATION OF GEOMAGNETIC DISTURBANCE AND RECORDING MEDIUM THEREFOR

摘要

Provided are ocean magnetic survey measurement method and system. The ocean magnetic survey measurement method includes a measuring operation for measuring an earth's magnetic field value using a magnetometer according to a heading angle of a probe, which is measured in clockwise direction on a basis of the true north, while the probe moves along a circular path based on a center point in an exploration target area with the magnetometer taken in tow, a data input operation for receiving, by a calculation unit, data for the heading angle of the probe and data for the earth's magnetic field value measured at the heading angle, a calculating operation for setting, by the calculation unit containing a calculation program therein, a magnetic disturbance value induced by the probe, which is included in the measured earth's magnetic field value, and calculating an actual earth's magnetic field value by subtracting the magnetic disturbance value from the measured earth's magnetic field value.

主权项

1. A method for measuring a total earth's magnetic field for an ocean magnetic survey, the method comprising:
a measuring operation for measuring an earth's magnetic field value using a magnetometer according to a heading angle of a probe, which is measured in clockwise direction on a basis of the true north, while the probe moves along a circular path based on a center point in an exploration target area with the magnetometer taken in tow; a data input operation for receiving, by a calculation unit, data for the heading angle of the probe and data for the earth's magnetic field value measured at the heading angle; a calculating operation for setting, by the calculation unit containing a calculation program therein, a magnetic disturbance value induced by the probe, which is comprised in the measured earth's magnetic field value; calculating an actual earth's magnetic field value by subtracting the magnetic disturbance value from the measured earth's magnetic field value; and the magnetic disturbance value in the calculating operation is calculated by the following Equation (1),
magnetic disturbance value=C0+C1 cos θ+C2 cos 2θ  (1) where θ denotes the heading angle of the probe, which is measured from the true north in clockwise direction, C0, C1, and C2, denote constants according to magnetic characteristics of the probe and distances from the exploration target area and the magnetometer to the probe, and the calculation program determines the constants of Equation (1).