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Two separation cameras and four fixed monitor cameras are mounted on solar sail demonstrator “IKAROS” in order to get panoramic view of the sail. Both cameras were designed to be wide field of view, and this cause huge lens distortion. In this paper, we describe the method to correct lens distortion and estimate the dynamics of separated cameras based on bundle adjustment, and also measure the displacement of sail tips using images taken by the two different kinds of cameras on orbit. For 3-dimensional shape estimation of the membrane, we use renormalization technique for removing statistical error bias, and find that the membrane is slightly bent to the direction of the sun.

Sail Shape Estimation of IKAROS Based on Flight Images