There is a large deviation between the actual position of the missile and inertial guidance position in the final guidance stage due to the inertial navigation error, which influences seeker,s accurate on positioning to the target, so it can not meet the application needs of precision strike. Due to the special imaging geometry of the missile borne Synthetic Aperture Radar (SAR) in the descending section, the squint angle plane of the target point is different from the imaging plane, so the traditional positioning method based on Doppler angle measurement is no longer applicable. This paper uses image matching to obtain high precision ground point relative position information and the high precision slant range information between radar and target point. By constructing a Euler tetrahedral geometry model, using the scene digital elevation as a priori information to screen the reference point, the actual position of the missile in the established North-sky-East coordinate system with an origin of the target point is calculated. Then it can provide accurate information for the missile maintenance. Simulation results show that this method can meet the requirements of target positioning on missile terminal guidance stage well.
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