Thea Falkenberg and Martin Sørensen 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 mono & ½ wave dipole AAUSat1: Two perpendicular dipole-antennas. Many seem 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.
Thea Falkenberg and Martin Sørensen 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