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CubeSat subsystems Thea Falkenberg and Martin Sørensen Mechanical structure Thea Falkenberg • • • • AAUSat structure. Milled from one piece. Used last time. Weight ~ 200 g (maybe less) • HAUSat1 structure. • 12 pieces. Many screws • weight (270 g) • CP structure • Triangular assembly • 2 main parts • each part 4 pieces • Easy access to all subsystem-boards. • Many screws (16) • Weight: less than 300 g • Tested Canx-1 Cute HAUSat-1 Radio Thea Falkenberg • Cubesat XI-IV: ½ wave • AAUSat1: Two mono & ½ wave dipole perpendicular • Many seem dipole-antennas. to have copied Mea Huaka’i. Two ½ wave dipoles at 90 degrees • Most Cubesats uses COTS • All use PICOPacket • Most use Yaesu because of weight • Some use both (or have the other in reserve) • No casings • Slightly modified (not specified) • Common idea (maybe from Mea Huaka’i) • Patch abandonned for monopole because of measurement error. • Not updated webpage • Pictures may be comming • ”Next time” would push for 5/8 wave monopole antenna, or two 1/4 wave phased monopole radiators. (Mike Hammer) • Only High frequency communication • Only Patch antenna • Probably discarded again Radio summary • All communicate at 70 cm (435 MHz); some with uplink at 2 m (146 MHz) • Only Ncube has (maybe) a downlink at 2,2 GHz • Realistic power consumption seems to be ~ 2,5 W in Transmit-mode and ~ 0,2 W in Receive-mode. • Realistic weight seems to be down to 100 g. • Should fit on one PCB. • The radio PCB should preferably be placed as far away from the power PCB as possible. On Board Computer Thea Falkenberg and Martin Sørensen Power Martin Sørensen Solceller • De fleste bruger Triple Junction Celler (> 22%) • Standard størrelser • Emcore & Spectrolab Solcelle beregning for nCube Power Point Tracking (PPT) Ikke simpelt, men solcellernes effektivitet forøges! Batterier • • • • Li-ion (en del bruger Danionics) Kapacitet ~1500 mAh Vægt ca. 42 g pr. styk Voltage 3,0 – 4,2 V Danionics batteri