Design ESTCube-1

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1 design

1.1 measurements , weight
1.2 communications
1.3 software





design
measurements , weight

during development of estonian satellite mission decided make 1u cubesat. standard 1 unit (1u) cubesat base side length must 100.0±0.1 millimeters , satellite height must 113.5±0.1 mm. mass set in cubesat standard, highest possible mass 1u cubesat 1300 grams.


communications

communication satellite made @ 2 international amateur radio unions registered frequencies



437.250 mhz
437.505 mhz

periodic slow communication made using 18 wpm telegraphy signal on frequency of 437.250 mhz. @ frequency, important satellite parameters returned every 3 10 minutes. fast connections fsk-modulation radio signals on frequency of 437.505 mhz 9600 baud connection speed , ax.25 packet standard used. relatively slow connection speeds result use of amateur radio frequencies limits bandwidth 25 kilohertz. fast connection used when satellite has been given specific order. both telegraphy , packet telemetry protocols of estcube-1 published on project webpage.


commands sent satellite used 145 mhz (2 meter) amateur band.


software

estcube-1 microcontrollers use following operating systems:



freertos on satellite s command , data handling system , camera module.
tinyos on satellite s communication module. (typically used devices running on low power)

mission control system being developed students of tartu university under supervision of company cgi group.








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