Abstract
The ocean is a very important arena in modern warfare where all marine powers deploy their military forces. Due to the complex environment of the ocean, underwater equipment has become a very threatening means of surprise attack in modern warfare. Therefore, the timely and effective detection of underwater moving targets is the key to obtaining warfare advantages and has important strategic significance for national security. In this paper, magnetic flux induction technology was studied with regard to the difficulty of detecting underwater concealed moving targets. Firstly, the characteristics of a magnetic target were analyzed and an equivalent magnetic dipole model was established. Secondly, the structure of the rectangular induction coil was designed according to the model, and the relationship between the target’s magnetism and the detection signal was deduced. The variation curves of the magnetic flux and the electromotive force induced in the coil were calculated by using the numerical simulation method, and the effects of the different motion parameters of the magnetic dipole and the size parameters of the coil on the induced electromotive force were analyzed. Finally, combined with the wavelet threshold filter, a series of field tests were carried out using ships of different materials in shallow water in order to verify the moving target detection method based on magnetic flux induction technology. The results showed that this method has an obvious response to moving targets and can effectively capture target signals, which verifies the feasibility of the magnetic flux induction detection technology.
Highlights
The ocean is a very important stage in modern warfare where all countries deploy various military forces [1,2]
Based on the principle of magnetic flux induction technology, this paper proposes a passive method that can be used to obtain and analyze the change in magnetic flux signal caused by underwater moving targets
When a moving target is close to a detection coil, the magnetic field of this target can be simulated by multiple magnetic dipoles; when the distance is far—that is, when the distance is greater than 3 times the size of the target—it can be treated as one magnetic dipole
Summary
The ocean is a very important stage in modern warfare where all countries deploy various military forces [1,2]. The noise caused by the new underwater moving targets that have been continuously launched by the United States, Russia, and other countries in recent years has been lower than that of the marine background environment, meaning that it is difficult to find, identify, and track them by sonar. Characteristic parameters such as the speed, depth, and magnetic moment of the targets can be obtained This method has the advantages of a short execution time, lower impact from the complex shallow sea environment, all-weather working ability, and low cost. It is of great significance for providing early warnings of moving targets in coastal water areas, for island defense, and for providing early warnings in key areas
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