Thea Falkenberg, Jakob Harming and Martin Sørensen

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1 Thea Falkenberg, Jakob Harming and Martin Sørensen
CubeSat subsystems Thea Falkenberg, Jakob Harming and Martin Sørensen

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

3 Mechanical structure Thea Falkenberg

4 AAUSat structure. Milled from one piece. Used last time. Weight ~ 200 g (maybe less) HAUSat1 structure. 12 pieces. Many screws weight (270 g)

5 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

6 Canx-1 Cute HAUSat-1

7 Radio Thea Falkenberg

8 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

9 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)

10 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)

11 Only High frequency communication
Only Patch antenna Probably discarded again

12 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.

13 Thea Falkenberg and Martin Sørensen
On Board Computer Thea Falkenberg and Martin Sørensen

14 5 V MHz frekvens 2 processorer

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

16 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?

17 Power Martin Sørensen

18 Solceller De fleste bruger Triple Junction Celler (> 22%)
Standard størrelser Emcore & Spectrolab

19 Solcelle beregning for nCube

20 Power Point Tracking (PPT)
Ikke simpelt, men solcellernes effektivitet forøges!

21 Batterier Li-ion (en del bruger Danionics) Kapacitet ~1500 mAh
Vægt ca. 42 g pr. styk Voltage 3,0 – 4,2 V

22 Danionics batteri

23 NCube

24

25 ADCS Jakob Harming

26 ADCS Sensorer Actuators Power and weight
Magnetometer – Honeywell (Kalman filter) Sun sensor – (DTU, Silonex... ) Gyroskoper (picoelectrical) GPS Temperatur Actuators Magnetic torque coils Permanent magnet with damper Gradient boom Power and weight 6-15 V for digital magnetometer V (typical 3 V) for magnet sensor 75 mW typical mW maximum Less than 100 gram for Sun sensors, torque coils and magnetometer (Kutesat, DTUsat... )