Motion estimation of unknown rigid body under no external forces and moments

This paper presents a method to estimate and to predict general three-dimensional motions of an unknown rigid body under no external forces and moments using visual information, which is applicable to autonomous space robotic missions. Four parameters of dynamics and a reference coordinate frame to describe the motion are computed based on the Euler´s equation of motion from a sequence of angular velocity vectors extracted from difference of images. Through computer simulations for various kinds of motions the effectiveness and limitation of this method are discussed