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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 Pass should be close to mid-day over target area for best light conditions Should be limited to ensure satellite pass by target area day-time during summer/autumn time |
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 |