CubeSat subsystems Thea Falkenberg and Martin Sørensen

Satellitter undersøgt:  Opsendt i 2003, virker ikke: AAUSat1: Kamera AAUSat1: Kamera DTUSat: Kamera, Tether DTUSat: Kamera, Tether Canx-1: Star-tracker. Canx-1: Star-tracker.  Opsendt i 2003, virker: CUTE: Udfoldeligt Sol-batteri/Padle ? CUTE: Udfoldeligt Sol-batteri/Padle ? CubeSat XI-IV: ? CubeSat XI-IV: ?  Venter på opsendelse med DPNER i 2005 CP1: uden payload CP1: uden payload CP2: venter på forslag (33 %) CP2: venter på forslag (33 %) Mea Huaka’i: Antenne, Thermo sensor, Attitude Kontrol. Mea Huaka’i: Antenne, Thermo sensor, Attitude Kontrol. Rincon: Analog Beacon signal (sofistikeret low-power) Rincon: Analog Beacon signal (sofistikeret low-power) Sacred: Strålingsmåler og test af componenter. Sacred: Strålingsmåler og test af componenter. Ncube: GPS, Kamera Ncube: GPS, Kamera Merope: Strålings måler (Van Allan bælte) Merope: Strålings måler (Van Allan bælte) KUTESat: Kamera KUTESat: Kamera HÁUSat1: GPS, udfoldeligt solpanel, hjemmelavet sol-sensor HÁUSat1: GPS, udfoldeligt solpanel, hjemmelavet sol-sensor ICECUBE: Bestemme fejlmargen i GPS-systemer. ICECUBE: Bestemme fejlmargen i GPS-systemer. ION: Photo-multiplier tube, electric propulsion-system. ION: Photo-multiplier tube, electric propulsion-system. SEEDS: None SEEDS: None

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)

 Easy access to all subsystem-boards.  Many screws (16)  Weight: less than 300 g  Tested CP structure Triangular assembly 2 main parts each part 4 pieces

Canx-1 HAUSat-1 Cute

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)

 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)  Patch abandonned for monopole because of measurement error.

 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

 5 V  MHz frekvens  2 processorer

 Intet operativ system  Mange RAM  Virkede ikke  Høj frekvens  Købt sig fra det  Ikke opsendt endnu

OBC summary  Ingen standard – Mange PIC processorer.  Helst 4 Mhz  3.3/3.6 V (ICECube: 11.7/10.8 V. Ingen andre oplysninger)  I^2 C Bus. Ingen Can. Enkelte SPI og one-wire  Konsekvens af ikke at have et operativ system?

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

 NCube