基于磁梯度张量不变量的目标定位方法研究

Research on Target Localization Method Based on Magnetic Gradient Tensor Invariants

摘要:

基于磁梯度张量的单点目标定位方法，可根据目标磁梯度张量和目标在探测点产生的磁场解算目标位置，但是由于受到地磁场影响，无法准确得到目标产生磁场。针对这一问题，提出了一种磁梯度张量不变量目标定位算法。该方法通过求解磁梯度张量的3个特征值，并通过这3个特征值构造了一个与目标磁矩及位置方向无关的磁梯度张量不变量，推导了相应的目标定位方法。该方法不受地磁环境影响，适用于移动平台对目标定位。仿真实验结果表明：提出的磁梯度张量不变量目标定位方法与磁梯度张量的单点目标定位方法相比基本不受地磁场影响，且定位精度较高。

Abstract:

The single point target localization method based on magnetic gradient tensor can be used to calculate the target position based on the target magnetic gradient tensor and the magnetic field generated by the target at the detection point. But due to the influence of the geomagnetic field，it is difficult to accurately obtain the magnetic field generated by the target. To address this issue，a target localization algorithm based on magnetic gradient tensor invariants is proposed. By solving the three eigenvalues of the magnetic gradient tensor，magnetic gradient tensor invariants that are independent of the target magnetic moment and position direction are constructed， and the corresponding target localization method is derived. This method is not affected by the geomagnetic field and is suitable for target localization on moving platforms. The simulation results show that the target localization algorithm based on magnetic gradient tensor invariants proposed in this paper is basically not affected by the geomagnetic field and has high localization accuracy.