Trial Report of Localization for Visual Based Tracking System in Asteroid Flyby

Abstract

Flyby imaging has attracted attention as a method of small body exploration. The visual-based tracking system has been widely used to obtain high-quality images. The high relative velocity between the spacecraft and asteroid makes it difficult to track the target asteroid completely around the closest approach point. The uncertainties of the measured relative parameter cause uncertainties in the required control trajectory profiles for the asteroid tracking. This study proposes a two-degree-of-freedom control system considering the relative parameter uncertainties. In particular, this study performs localization, that is, relative position estimation between the spacecraft and asteroid. A particle filter is applied to the estimator, and its applicability and limitations are discussed through a numerical simulation of a case study.