Abstract: To measure the relative position between smart munition and vehicle, a location algorithm for imaging fuze based on target geometrical characteristics which are non-cooperative and inherent is proposed. A space imaging model under the fast rendezvous is established to solve the problem, and then the axes of vehicle are defined according to the characteristics of vehicle. The plane consisting of optical center and feature lines across the axes is set up, the parallel relationship among axes and intersecting lines is proved, and the direction vectors of three target-coordinate axes are educed. Based on the direction vectors of target-coordinate axes and the method of undetermined coefficients, a medial plane which includes vehicle’s axes is described by expression. According to the distance constraints from 3D point to plane, the relative position between smart munition and vehicle is resolved by strict derivation. The effect of relative pose on solving error is analyzed, and the error rules are proved by experiments. The experimental results indicate that the relative error of location is less than 5% when the height of smart munition is less than 100 m, and the location algorithm could solve the relative position with high precision.

Key words: ordnance science and technology, imaging fuze, relative position, non-cooperative feature, direction vector, positioning accuracy