Single detector compound axis system employs a two-axis mirror to achieve target acquisition

Abstract

Airborne electro-optical countermeasure systems necessitate designs that are both lightweight and miniaturized. This study examines a single-detector composite-axis system that integrates a large-stroke, large-aperture two-axis mirror for coarse tracking tasks and a piezoelectric fast-steering mirror for fine tracking adjustments. Addressing the system’s initial pointing and spiral scanning challenges, the study derives dynamic target-pointing equations using coordinate transformation and optical geometry. Neural network fitting is utilized to analyze the coupling between the mechanical travel angle of the two-axis mirror and the optical angle changes. Scanning detection and image motion compensation techniques enhance the system’s field of view. The paper also introduces the application of differential evolution algorithms for target positioning without distance information. Ground-to-air experiments substantiate the effectiveness of the proposed methods.