抄録
NASDA and ISAS have been investigating the lunar explorer vehicle which is based on Japanese technologies. The spacecraft consists of an orbiter, a relay satellite, and experimental landing probe for acquisition of the basic soft-landing technology. The major purpose of this landing probe is demonstration of soft-landing based on Japanese technology for future activity on the Moon. This is the first experience in Japan but the landing probe has a quite challenging technique: the autonomous soft-landing. This paper shows the conceptual design results conducted by NASDA in 1996. At first, we describe the outline of the flight sequence for landing. And we show the investigation results of the guidance algorithms for the powered-descent and vertical-descent phases, and show the results of navigation and guidance simulations for the powered-descent phase. At last, the autonomous obstacle avoidance control during vertical-descent are described which will be required for safe or high-precise landing in the future lunar missions.
