基于有限脉冲响应模型的飞机磁场补偿方法

通过分析飞机磁场数学模型,将飞机磁场表示成方向余弦与其乘积项的函数.鉴于模型参数之间存在很强的复共线性,提出了基于有限脉冲响应模型飞机磁场补偿方法.该方法将光泵磁强计和三轴磁强计的输出作为有限脉冲响应模型的输入,由带通滤波器提取信号中的变化成分,再用最小方差估计有限脉冲响应模型参数,并利用有限脉冲响应模型参数计算飞机磁场.从测量总磁场中减去飞机磁场,可得到目标信号磁场数据.最后,通过计算机仿真验证了该磁场补偿方法的有效性.

Airplane Magnetic Compensation Using Finite Impulse Response Model

By analysis of a mathematic model of aircraft magnetic field, the airplane magnetic field model was expressed by the direction cosine and its product terms. It was difficult to estimate the model parame ters by using conventional methods due to the model collinearity, so a new compensation method using the finite impulse response model was proposed. The outputs of optical pumping magnetometers and three-axi al magnetometers were used as the inputs of finite impulse response model. The band-pass filter was used to extract the variation magnetic field, and the minimal variance was employed to estimate parameters of the finite impulse response model. The airplane magnetic field data was obtained by using parameters of fi nite impulse response model. The total magnetic field data subtracted by the airplane magnetic field data gives the detected object magnetic data. Finally, the method was validated by a computer simulation.