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中文摘要：
分析了混合于地磁场的偶极子目标磁场难以分离,致使水下磁场定位方法存在目标磁场模值不易获得的难题,提出了基于2次测量载体潜深实现定位的方法,利用潜深直接获取载体相对于目标的垂向距离,理论推导和数值仿真结果表明该方法原则上具有较高的定位精度.分析了潜深及磁场梯度误差对定位精度的影响及定位误差同2次潜深差的关系;讨论了单次测量潜深及目标磁场梯度实现定位的可能性与局限性;对利用定位结果计算目标磁矩的方法进行了理论分析与数值仿真,证实了其可行性.
英文摘要：
Handicap to acquire magnetic field magnitude in situation of underwater magnetic localization due to the difficulty of separating magnetic field of dipole target mixed with geomagnetic background field was analyzed.An underwater localization method based on double measurements of vehicle draft depth and target magnetic gradients at different depth places was put forward.In the localization method,the vertical displacement of relative to target could be directly obtained by its draft depths.Theoretical analysis and numerical simulation all show that localization precision for the algorithm is higher in principle.The effects of measurement errors draft depth and magnetic gradients on localization and the relationship between vehicle localization error and its distance relative to target were both analyzed.The feasibility and limitation for another localization method through measurement of draft depth and magnetic gradients once was discussed.The idea of target magnetic moment inversion from localization information was proposed and simulated numerically,and the investigation proves the feasibility.
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