摘要
Tolles-Lawson(T-L)方程广泛应用于航磁干扰补偿,在模型中地磁场被设定为恒定值。但实际中地磁场存在梯度,补偿精度会受到影响。针对这一问题,在传统T-L模型中考虑了地磁场梯度变化,推导出非恒定地磁场的参数估计和补偿公式。根据飞行器同一航迹下正飞与反飞情况干扰磁场的关系,可实现磁梯度修正,然后将测量数据代入模型中进行补偿,获取高精度的磁场测量值。仿真结果表明:线性和非线性变化的地磁梯度情况下,标准差均值分别从0.1423 nT降为0.0802 nT和0.1827 nT降为0.0665 nT,证明改进的模型对磁干扰有较好的补偿效果。
Tolles-Lawson(T-L)equation is widely used in aeromagnetic interference compensation,in model,the geomagnetic field is set to a constant value.But in practice,there is a gradient in the geomagnetic field,and the compensation precision will be affected.To solve this problem,the gradient variation of geomagnetic field is considered in the traditional T-L model,and the parameter estimation and compensation formulas of the unsteady geomagnetic field are derived.According to the relationship between forward flight and anti-flight disturbance magnetic field under the same flight path,the magnetic gradient can be corrected,and then the measured data can be brought into the model to compensate,and the high-precision magnetic field measurement value can be obtained.The simulation results show that the mean standard deviation decreases from 0.1423 nT to 0.0802 nT and 0.1827 nT to 0.0665 nT,respectively,in the case of linear and non-linear geomagnetic gradients,which proves that the improved model has better compensation effect for magnetic interference.
作者
潘雪
张琦
潘孟春
刘中艳
陈卓
刘舒畅
PAN Xue;ZHANG Qi;PAN Mengchun;LIU Zhongyan;CHEN Zhuo;LIU Shuchang(Department of Intelligence Machinery and Instruments,National University of Defense Technology,Changsha 410000,China)
出处
《传感器与微系统》
CSCD
2020年第10期5-7,10,共4页
Transducer and Microsystem Technologies
关键词
非线性变化
地磁梯度
磁干扰
标准差
nonlinear change
geomagnetic gradient
magnetic interference
standard deviation
