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Level 3, 4, 5: GNSS + Extraterrestrial

Level 3, 4, 5: GNSS + Extraterrestrial. GNSS and SLR Satellites: More than 100 GNSS satellites in 2020: GPS (24/32) , GLONASS (24/19), GALILEO (30/1), QZSS (3/0), COMPASS (30/4), …

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Level 3, 4, 5: GNSS + Extraterrestrial

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  1. Level 3, 4, 5: GNSS + Extraterrestrial GNSS and SLR Satellites: • More than 100 GNSS satellites in 2020: GPS (24/32) , GLONASS (24/19), GALILEO (30/1), QZSS (3/0), COMPASS (30/4), … • Cheap LAGEOS-type satellites with laser retro-reflectors and with GNSS receivers forming a network in space with internally 1 mm accuracy (distances up to 14’000 km)‏ Geodetic Planetary Missions: • Bepi Colombo, Mars missions, lunar exploration (GRAIL, LEO), … Stars (observed with CCD cameras or in future with GAIA)‏ Quasars

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