Nara's method is affected greatly by the background magnetic field as the magnetic induction of the target is requisite.To solve this problem, a novel online location method which used the magnetic gradient tensor and the magnetic induction of two points to locate the magnetic dipole was proposed in this paper.The result of simulation experiments indicated that the location precision of the proposed method was free from the affection of the uniform background magnetic field and the localization success rate of the promoted method was 44.69％, while the others improved Nara methods was smaller than 37.65％.%针对Nara方法中目标磁感应强度难以准确测量的问题,提出了基于两点磁梯度张量的磁偶极子在线定位方法.该方法利用任意两点的磁梯度张量差分量与目标磁感应强度差分量定位磁偶极子.仿真实验结果表明,该方法定位成功率不受背景磁场的影响;相同条件下,该方法的定位成功率为44.69％,而以往改进方法最高定位成功率为37.65％.
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