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 carrier 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%.