Abstract
Detection of ferromagnetic objects in local magnetic anomaly of the Baltic Sea In geological researches several kinds of methods are applied to discovering the natural resources. Planes, helicopters and UAVs (UnmAnned Vehicle) are used in researches in large areas. The gravity, electromagnetic and magnetic methods, which are used in geological researches, are presented in this paper. The special attention was paid to magnetic systems installed on mobile platforms. The magnetic field of the Earth obtained from mathematical model was compared to the real magnetic field in the selected part of the Baltic Sea. The results of the calculations showed that the mathematical model of the Earth's magnetic field does not consider local magnetic anomalies. The strong local magnetic anomalies cause serious problems with detection of underwater objects. Special problems appear in the magnetic system on a helicopter, which are presented in this paper.
Highlights
In geological researches several kinds of methods are applied to discovering the natural resources
The gravity, electromagnetic and magnetic methods are applied to researches
This patrol-pathfinder navy plane An−28B1R Bis is used for instance in searching and tracking of submarines in the Baltic Sea.The systems installed on a helicopter do not need the compensator, if the magnetic sensor is in the remote distance from the helicopter
Summary
In geological researches several kinds of methods are applied to discovering the natural resources. The gravity, electromagnetic and magnetic methods are applied to researches. The electromagnetic method is applied to measure the conductivity of the soil. The time-varying secondary field produces emf voltage in the measure coil. The biggest MEGATEM system is installed on Dash 7 plane and allows to discover the natural resources up to 300 m. Homogeneity of the Earth’s magnetic field is disturbed by different properties of the Earth’s layers This method is applied to detection of ferromagnetic objects (UXO – UneXploded Objects, submarines, wrecks, landmines and marine mines). The influence of the strong local magnetic anomaly on the magnetic measurements, with systems installed on planes and helicopters, was presented in this paper. The calculations of the magnetic field were carried out in MathCad [6]
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