A new recognition method aimed at optical reconnaissance attitude based on laser active interference

Abstract

The optical target reconnaissance attitude, that is, the optical axis pointing of photographic or detection equipment, is an important parameter for active laser detection systems. A new recognition method aimed at optical target reconnaissance attitude based on active coherent laser beams is presented. Using the cat's eye effect of reflected light from active coherent beams scanning through an optical target along two orthogonal directions, optical target reconnaissance attitude can be calculated by measuring the edge peak amplitude ratio of the two reflected light time distribution envelopes. The usability of this method is validated through theoretical analysis and experiment. The results show that the theoretical minimum relative error of the recognition method is ⪅1%. The greater the deflection angle is, the smaller the mean of the relative error, the required fringe spacing for the minimum relative error are and the smaller influence of detection distance on relative error, therefore the more accurate the estimation will be. This method can improve the parameter identification ability of existing active laser detection and recognition systems, and it has important practical significance in judging the area of reconnaissance and tracking of optical targets.