地磁场中磁目标的等效衰减磁矩定位方法  

Location Method of Equivalent Attenuation Magnetic Moment of Magnetic Target in Geomagnetic Field

作　　者：贾文抖 林春生[1] 孙玉绘[1] 翟国君[2,3] 

机构地区：[1]海军工程大学兵器工程学院,湖北武汉430033 [2]海军工程大学导航工程系,湖北武汉430033 [3]海军海洋测绘研究所,天津300061

出　　处：《兵工学报》2018年第2期283-289,共7页Acta Armamentarii

基　　金：国家自然科学基金项目(41374018;41476087);国家重大科研装备研制基金项目(ZDYZ2012-1)

摘　　要：为在地磁场中获取磁目标的位置参数,提出了一种基于等效衰减磁矩的磁目标定位方法。建立了正六面体的测量模型,计算了正六面体中心点和侧面中心点的等效衰减磁矩,得到了磁偶极子目标的定位公式。分析了地磁场、磁梯度测量噪声、正六面体边长基线及磁力仪测量精度等因素对磁偶极子目标定位结果的影响。仿真结果表明:该方法能有效克服地磁场的干扰,实现对磁偶极子目标的可靠定位;与以往的计算模型相比,在张量差分计算基线相同的情况下,可使原模型体积减小64.7%,定位精度更高。A location method based on equivalent attenuation magnetic moment is proposed to obtain the position parameter of magnetic target in geomagnetic field. A spatial model of regular hexahedron is established to measure the magnetic field for magnetic source positioning. The equivalent attenuation moments of the geometric central point and the side central point of regular hexahedron are calculated. The positioning formula based on equivalent attenuation magnetic moment for magnetic dipole target is de- duced. The influences of some factors, such as geomagnetic field, magnetic gradient measurement noise, regular hexahedral baseline, measurement accuracy and so on, on the location inversion parameter of magnetic target are analyzed. The calculated results show that the proposed method can effectively overcome the interference of the geomagnetic field and achieve a reliable positioning result of magnetic target. The proposed method can significantly reduce the size of the original computation model by 64.7% with higher positioning accuracy.

关 键 词：磁目标定位 磁梯度张量不变量 等效衰减磁矩 地磁场 

分 类 号：TJ517[兵器科学与技术—军事化学与烟火技术] O441.5[理学—电磁学]