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International space agencies have a growing interest to bring humans and robotic space vehicles back to the Moon and to support permanent manned and unmanned space exploration missions to the Moon and to other celestial bodies of the solar system. Along the critical path to achieve this goal, advanced guidance, navigation, and control technologies are required to guarantee spacecraft safety and accuracy when orbiting and landing on the Moon. Future lunar exploration missions will aim at safely and accurately landing a spacecraft close to impact craters or nearby other geological features of scientific interest. To successfully achieve these objectives, the spacecraft must have the ability to autonomously or semi-autonomously perform critical landing operations. These operations include GPS-like localization of spacecraft using lunar landmark tracking, trajectory guidance toward known targets on the surface, detection of surface hazards, and guidance toward safe landing areas. Such technologies are clearly... |