Abstract: The 3Cat-3/MOTS (3: Cube, Cat: Catalunya, 3: 3rd CubeSat mission/MissiÃ?³ ObservaciÃ?³\nTerra SatÃ?¨lÃ?·lit) mission is a joint initiative between the Institut CartogrÃ? fic i GeolÃ?²gic de Catalunya\n(ICGC) and the Universitat PolitÃ?¨cnica de Catalunya-BarcelonaTech (UPC) to foster innovative\nEarth Observation (EO) techniques based on data fusion of Global Navigation Satellite Systems\nReflectometry (GNSS-R) and optical payloads. It is based on a 6U CubeSat platform, roughly a 10 cm\nÃ?â?? 20 cm Ã?â?? 30 cm parallelepiped. Since 2012, there has been a fast growing trend to use small satellites,\nespecially nanosatellites, and in particular those following the CubeSat form factor. Small satellites\npossess intrinsic advantages over larger platforms in terms of cost, flexibility, and scalability, and may\nalso enable constellations, trains, federations, or fractionated satellites or payloads based on a large\nnumber of individual satellites at an affordable cost. This work summarizes the mission analysis\nof 3Cat-3/MOTS, including its payload results, power budget (PB), thermal budget (TB), and data\nbudget (DB). This mission analysis is addressed to transform EO data into territorial climate variables\n(soil moisture and land cover change) at the best possible achievable spatio-temporal resolution.
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