地磁场梯度对飞机磁场求解精度的影响分析

Impacts of Geomagnetic Gradient on Solving Precision of Aircraft Magnetic Field

摘要: 分析了地磁场梯度对飞机磁场模型的影响,利用飞机磁补偿实验数据及地磁场梯度仿真数据,对考虑地磁场梯度和不考虑地磁场梯度两种情况下飞机磁场的求解结果进行了比较,并对飞机在0°、90°、180°、270°四个特定航向上,进行横滚、俯仰、偏航机动飞行时产生的干扰磁场进行了仿真补偿实验。仿真结果表明,地磁场梯度引起的模型系数计算偏差最大可达5.24,相应的磁干扰补偿率将下降35.3%。

Abstract: We analyzed the impact of the geomagnetic gradient on aircraft magnetic filed,and solved the aircraft magnetic filed model with flight test data of aircraft magnetic compensation and calculated value of geomagnetic gradient.The solving results of considering geomagnetic gradient and without considering geomagnetic gradient were compared.Then the compensation simulation test of interference magnetic field was carried out,and the interference magnetic field was caused by tumble,pitch and yaw of aircraft in 0°,90°,180°,270°courses.The results of simulation show that absolute error of model coefficient caused by geomagnetic gradient can reach as large as 5.24,and the improve rate(IR) will reduce 35.3%.