基于海底侦测的目标轴频电磁场幅值特性研究

Characterization of Target Axial-frequency Electromagnetic Field Amplitude Based on Undersea Detection

摘要:

随着我国对海洋国防的不断重视，以及传统声学探测水下目标技术问题的难度加大，水下目标电磁探测技术近年来取得长足进步。轴频电磁场是水下目标电磁探测技术的重要研究内容，然而，目前相关仿真研究仍多基于测线分析，而针对测网观测的轴频电磁场空间分布特性和可探测范围的相关研究仍较为匮乏。本文分析了前人研究存在的问题，并以时谐水平电偶极子作为等效场源，基于积分方程法模拟讨论探测装置位于海底情形下轴频电磁场分布特性；之后，对基于海底观测网的轴频电场和轴频磁场的可探测范围进行了对比分析；然后，本文讨论了目标行进方位对轴频电磁场分布的影响；最后，笔者对轴频电磁场未来研究思路进行了展望。

Abstract:

Underwater target electromagnetic detection technology has made great progress in recent years due to China’s continuous interest in marine defense and the difficulty of traditional acoustic detection of underwater targets. The axial-frequency electromagnetic field is an important topic of research in underwater target electromagnetic detection technology, and however, at present, the relevant simulation research is primarily based on the measurement line analysis, and there is still relatively little research on the spatial distribution characteristics of axial-frequency electromagnetic fields observed by the measurement network, as well as the detectable range. Analyzing the problems of previous studies, this paper employed a time-harmonic horizontal electric dipole as the equivalent field source. By using the integral equation method, the numerical simulation of the distribution characteristics of the axial-frequency electromagnetic field of detection devices located on the seafloor were performed., and then, the detectable range of axial-frequency electric field and magnetic field were comparatively analyzed. Besides, we discussed the influence of the target travelling orientation of the field. Lastly, we provided an outlook on future research ideas of this field.