An Attitude Measurement Method for Spin-Stabilized Projectiles Using Dual High-Speed Cameras

High-precision flight-attitude data for spin-stabilized projectiles are essential for aerodynamic parameter identification and dynamic analysis. However, the severe launch overload and high spin rate of such projectiles make many onboard attitude measurement devices difficult to use reliably. This paper presents a non-contact method for measuring the position and attitude of spin-stabilized projectiles using dual high-speed cameras. First, a dual-camera attitude measurement framework is established, and the relationship between the projected attitude in the image plane and the actual projectile attitude is derived. A contour-matching method based on the particle swarm optimization (PSO) algorithm is then proposed to extract projectile pose information from low-resolution images with blurred boundaries and weak texture features. Finally, the image-based measurements are combined with ballistic constraints to reconstruct the projectile attitude motion. Flight-test results validate the feasibility and stability of the proposed method.