It is a necessary link for aeromagnetic interference compensation in aircraft geomagnetic naviga-tion.At present,the Tolles-Lawson(T-L)model widely used in aeromagnetic exploration needs extension rods or dragging,which makes it difficult to meet the application requirements of geomagnetic navigation without changing the aerodynamic appearance of the aircraft.An aeromagnetic compensation method which can adapt to the in-cabin installation of magnetometer is proposed.The method extends on-board electronic systems(OBE)interference term based on the T-L model.Meanwhile,to solve the problem of unknown frequency domain distribution and the complex interference sources,a filter cutoff frequency determination method is proposed based on knee point calculation of fre-quency spectrum and a model input feature selection method is designed based on correlation con-tribution calculation of current and voltage.Finally,the principal component analysis(PCA)is used to reduce the impact of multicollinearity of the model.The effectiveness of the method is ver-ified through a set of open-source manned aircraft magnetic measurement flight data,and the re-sults show that this method has better compensation accuracy for in-cabin magnetic measurement data than other methods.The root mean square error between the optimal compensation result and the true value is 1.71 nT,which can basically meet the accuracy requirements of geomagnetic navi-gation terminals.
Aeromagnetic interference compensationMagnetic interference modelOn-board elec-tronic systems interferenceGeomagnetic navigation
NETL
NSTL
万方数据
