Table 5.
ICARUS UL Link Budget.
| Parameter | Value in 402.25 MHz |
|---|---|
| Chip rate | 900 kHz |
| Spreading factor | 1023 |
| Orbit height | 400 km (time varying) |
| Max. single-sided UL antenna opening angle | 55° |
| Max. Slant path (direction edge of coverage) | 872 km |
| Swath width | 800 km depending on ISS orbit height |
| UL tag EIRP | 8 dBm (derived from tag antenna chamber measurement campaigns) |
| UL tag antenna gain due to imperfect pointing | −1 dBi |
| Satellite Rx antenna gain max | 4 dBi in bore sight (3 antenna elements each of a different backward tilt and off-track directivity) |
| Satellite Rx antenna gain edge of coverage | 1 dBi |
| Free space loss to Nadir | −138.5 dB |
| Free space loss to edge of coverage | −143.3 dB |
| Atmospheric losses | 0.1 dB |
| Fading loss | 0 dB (Rayleigh fading will be simulated in link budget calculations) |
| Satellite Rx feeder loss | 0.5 dB |
| Satellite antenna noise temperature including man-made interference | 2000 K (worst case), 700 K average case |
| Satellite receiver temperature | 500 K |
| Polarization loss | 3 dB |