Initial specifications and requirements for satellite bus
Parameter | Requirements | Justification | ||
---|---|---|---|---|
Mechanical subsystem | ||||
Payload physical envelope | ||||
Payload mass | ||||
Camera aperture placement | Zenith panel Flush with panel? | |||
Power subsystem | ||||
Payload energy consumption | 3 W for 3 minutes observation pr. pass | Estimation | ||
Downlink radio energy consumption | ||||
Peak power available | ||||
Communications | ||||
Downlink data rate (usable bits) | 1 - 2 Mbit | Size of one data packet: 500 pixels x 500 pixels x 2 bytes/pixel x 10 channels = 5 Mbytes = 50 Mbits 10 kanaler er typisk det vi får med komprimering i spektralt domene basert på IDLEtechs / Harald Martens teknologi. | ||
Downlink frequency band | ||||
Downlink power/EIRP needed | ||||
Ground station/data access | Depending on frequency band If possible, GS at NTNU, in addition to others | |||
Launch and orbit | ||||
Orbit type | Polar (may or may not be SSO) | Target area is far north, ground stations expected to be far north | ||
Orbit height | 400 - 600 | Low orbit preferable due to better resolution | ||
Orbit inclination | ||||
Other parameters | Ω: 30 - 45 deg
| Close to mid-day over target area
| ||
ADCS | ||||
Slewrate (max, precision) | 2 deg/s | In order to be able to point towards target during a pass | ||
Pointing accuracy | 0.1 deg | TBC | ||
Momentum budget | Satellite must be able to perform slewing manouver for four consecutive passes |