Optimal flight direction analysis for aeromagnetic anomaly detection of unknown attitude targets
In aeromagnetic anomaly detection,flight path optimization for aerial platform is one of the key approaches to improve magnetic anomaly signal intensity.However,the magnetic moment of a ferromagnetic target magnetized by geomagnetic field varies with its attitude,resulting that the spatial distribution of the target magnetic field is related to the unpredictable target attitude.In this paper,an accurate computation model of the magnetic moment of a typical target is established.The calculation results show that the modulus of magnetic moment generated by the geomagnetization of the target at different attitudes(orientation:0°～360° and pitch:-90°～90°)varies from 3.55 × 105 to 2.42 X 106 A·m2.The magnetic moment value reaches a maximum and minimum when the long axis of the target is in line with the direction of the geomagnetic field and perpendicular to the direction of the geomagnetic field,respectively.The difference between the calculation results and the simulation results is only 0.003％～0.04％.According to the analysis of aeromagnetic detection modeling,the angle between the path of the maximum magnetic anomaly signal in the flight plane and the projection of geomagnetic field varies from 0° to 50.045 7°.When the attitude and magnetic moment of the target are unpredictable,the path in line with the projection of geomagnetic field is a better choice.The variation of magnetic anomaly signal on this path is 78％～100％of the maximum variation in the flight plane.
magnetic anomaly detectionoptimal flight pathcomputation model of the magnetic momentsignal strength
NETL
NSTL
万方数据
