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
| 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 |