@prefix skos: . skos:prefLabel "GEMINI"@en ; a skos:Concept ; skos:narrower . skos:definition """Gemini (GPS-based Orbit Estimation and Laser Metrology for Intersatellite Navigation) is a technology mission, proposed by DLR?s German Space Operations Center (GSOC), Astrium GmbH, and Vectronic Aerospace GmbH. aiming The major Gemini mission objective is the controlled establishment of a satellite formation in a low-Earth orbit. To that end, advanced in-orbit technologies will be demonstrated based on laser metrology, as well as innovative GPS-based approaches to relative navigation. As part of its technological objectives, the Gemini formation control will entirely be based on an autonomous orbit control approach. Secondary mission objectives concern the separation concept from the launcher, the drift stop and the development of a controlled formation acquisition strategy. As a technology demonstration mission, emphasis is given to an independent verification of the relative distance by means of a laser radar sensor. To allow a formation flying demonstration for a wide ran ge of applications, the technologies for the control of the relative distance cover both the regime of close and wide formations ranging from several hundreds of meters up to 100 km. In contrast to the relaxed orbit control requirements of nowadays formations, Gemini aims at a relative position keeping of several cm to several meters, that is expected to be of significance for many of the upcoming formation flying missions and, in addition, paves the way for even more advanced requirements, such as for SMART 2. To achieve that level of control accuracy, the Gemini sensors have to provide relative position measurements in the range of millimeters or better, that may not be achievable solely using a spaceborne GPS receiver."""@en ; skos:prefLabel "GEMINI"@en ; skos:inScheme ; skos:broader ; a skos:Concept .