直升机平台背景磁干扰小信号模型求解与补偿

摘要

For helicopter external high precision magnetic survey pod detection platform,platform background magnetic interference mechanism is analyzed,and concluded that platform background magnetic disturbance consists of the aircraft cartier magnetic disturbance,fluctuating magnetic interference caused by pod swing and the magnetic disturbance caused by fluctuating track of platform.Magnetic survey pod trajectory calculation model and platform background magnetic interference small signal model are established.And combining with the characteristics of platform motion,small signal model solving method is given.Through simulation and calculation,the magnetic interference small signal model is verified,and the analysis results show that using the small signal model to solve and compensate the magnetic disturbance is completely possible,the adaptability is very good and magnetic disturbance compensation rate can reach more than 90％.%针对直升机外挂磁测吊舱探测平台,分析了平台背景磁干扰产生机理,得出平台背景磁干扰主要由飞机载体磁干扰、吊舱摆动引起的磁干扰和航迹波动引起的磁干扰三大部分组成,建立了磁测吊舱轨迹计算模型和平台背景磁干扰小信号模型.结合平台运动特点,给出了小信号模型求解方法,通过仿真计算,对磁干扰小信号模型求解进行了验证.分析结果表明,采用小信号模型对直升机平台背景磁干扰进行求解和补偿是完全可以的,适应性很好,磁干扰补偿率可达90％.