抄録
KAGUYA, which was called the SELenological and ENgineering Explorer (SELENE) in its development phase, is Japan’s first full-scale lunar explorer. KAGUYA was launched on September14, 2007, reached to a lunar orbit on October 3, 2007, and established a circular polar lunar observation orbit at an altitude of 100 km on October 18, 2007. KAGUYA necessitates a reliable attitude and orbit control system (AOCS) for a reliable lunar polar orbit insertion and an accurate lunar-center-pointing three-axis attitude control for high precision observations from lunar orbit. In addition, KAGUYA has to realize various different control mode before reaching the lunar orbit: sun acquisition, inertial-frame-pointing attitude control in lunar transfer orbit, attitude control at orbital maneuvers, attitude control for daughter satellite separations, and lunar-center-pointing attitude control for lunar observation. In fact, the AOCS must realize these different requirements for different phases using the limited resources of KAGUYA satellite. Considering these system requirements and technical challenges for the AOCS, we designed and developed the simple but reliable and accurate KAGUYA AOCS. This paper first shows an outline of KAGUYA’s system and mission profile, then describes the KAGUYA AOCS and its control modes, and finally presents AOCS operation results during the lunar transfer phase and the lunar orbit injection phase.
