1.8 KiB
1.8 KiB
Quickstart
Different types of orbit
- LEO
- Low Earth Orbit (160-2000km) -> A couple of minutes
- MEO
- Medium -""-(2000-35785 km) -> GPS
- GEO
- Geostationary orbit (above) -> Seems stationary but is actually moving with us
Satellite types
- FM Repeaters
- uplink on one band and downlink on another, so most optimally you need two antennas
- SO-50, AO-91, AO-92
- Linear transponders - Usually SSB and CW
- Transmit LSB and receive USB
- OSCAR-7, FO-29, AO-73
- Digital relay
- Like BBS
- FalconSAT-3
Doppler shift
- Upward shift when approaching
- Downward shift when departing
Terminology
| Abbreviation/Term | Translation |
|---|---|
| AOS (Acquisition of Signal) | Time that a satellite rises above the horizon |
| TCA(Time of closest apporach) | Time when the satellite is closest and Doppler shift is zero. Maximum elevation. |
| LOS(Loss of signal) | When satellite is no longer reachable |
| Footprint | Ground area - coverage |
| Uplink | Earth to Space |
| Downlink | Space to Earth |