Ship-borne magnetic force detection method and device

Abstract

The invention discloses a ship-borne magnetic force detection device which is installed on the ship body of a measuring ship without a stern drag part. The ship-borne magnetic force detection device comprises a vector magnetic force sensor, a heading attitude reference system, a GPS, a peripheral sensor, a data acquisition fusion unit and a data recording computer. The ship-borne magnetic force detection method comprises the following steps that (1) when a research voyage number starts and ends, a magnetic field calm sea area is selected and a ship magnetic calibration test is performed by a research ship; (2) the data acquisition fusion unit synchronously acquires magnetic force data and attitude data in the ship magnetic calibration test; (3) after the ship magnetic calibration test, a ship induced magnetic field coefficient, a permanent magnetic field coefficient value and an eddy current magnetic field coefficient are obtained by data acquisition software via calculation according to the following resolving process; and (4) after the ship magnetic calibration test, ship-borne magnetic force measurement is performed. Advantages of the ship-borne magnetic force detection method and device are that defects that a conventional drag type magnetometer is liable to be lost and damaged can be overcome, all-weather and all-voyage-number unattended magnetic force observation can be realized, and earth magnetic field vector measurement can also be provided.

Description

Technical field [0001] The invention relates to a shipborne magnetic detection method and device, belonging to the technical field of geophysical prospecting. Background technique [0002] The magnetic field around the earth is called the geomagnetic field. Use the geomagnetic field vector at any point on the ocean surface as , Then the geomagnetic field vector at that point The projections on the three axes in the rectangular coordinate system are the north component X, the east component Y and the vertical component Z; the geomagnetic field vector The projection in the horizontal plane is the horizontal component H; the geomagnetic field vector The angle between the horizontal plane and the horizontal plane is the magnetic inclination angle I; the angle between the vertical plane passing through this point H and the geographic meridian is the magnetic declination angle D. , Z, X, Y, H, I, and D are physical quantities that represent the size and direction of the geomagnetic...

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Problems solved by technology

[0004] On the other hand, the general marine total field measurement can only be done by towing. The magnetic probe is towed in the seawater behind the survey ship, and the length of the towing cable is more than three times the length of the ship.

This method of operation is easily restricted in some sea areas, such as offshore aquaculture areas, polar ice floes, etc., which will cause damage or even loss of the magnetic probe

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