A strapdown decoupling method of phased array radar explorer vehicle

A kind of line-of-sight（LOS） rate strapdown decoupling method of phased array radar explorer vehicle is proposed in this paper. Based on the relative motion relationship between target and flight vehicle in the target coordinate system， the second-order nonlinear model of the LOS angles and rates in the polar coordinate is derived， and the rates of LOS angles and the change rates of relative distance is estimated by using the method of extended Kalman filter. The simulation and comparison results show that the decoupling method can effectively isolate the deviation of reconfiguration LOS angles in target coordinate caused by the attitude errors， and can accurately acquire the LOS angle rates for guidance and enhance the arrival precision of flight vehicles. The method is simple for the engineering implementation and can serve as fairly good reference in the current flight vehicle field.