Research Article
AOCS Requirements and Practical Limitations for High-Speed Communications on Small Satellites
Table 22
Link budget for satellite with an orbit height between 400 km and 900 km.
| | Parameter | | | | 10° | 15° | 10° | 15° |
| | Comm. system | Data rate (Gbps) | 1.50 | 1.50 | 1.50 | 1.50 | | Wavelength (nm) | 1550 | 1550 | 1550 | 1550 | | Modulation format | Intensity modulation and direct detection | | Bit error rate | 1.0E − 06 | 1.0E − 06 | 1.0E − 06 | 1.0E − 06 |
| | TX | Output power (dBW) | 0.00 | 0.00 | 0.00 | 0.00 | | TX loss (dB) | 1.49 | 1.49 | 1.49 | 1.49 | | TX divergence FWHM (mrad) | 0.041 | 0.041 | 0.041 | 0.041 | | TX aperture diameter (cm) | 4.00 | 4.00 | 4.00 | 4.00 | | TX telescope gain Gt (dB) | 98.18 | 98.18 | 98.18 | 98.18 | | (dB) | 3.01 | 3.01 | 3.01 | 3.01 |
| | Channel | Link distance (km) | 1439 | 1175 | 2588 | 2224 | | (dB) | 261.34 | 259.58 | 266.44 | 265.12 | | (dB) | 3.50 | 2.50 | 3.50 | 2.50 | | (dB) | 4.00 | 3.00 | 4.00 | 3.00 |
| | RX | Aperture diameter (cm) | 60.00 | 60.00 | 60.00 | 60.00 | | RX-telescope gain (dB) | 121.42 | 121.42 | 121.42 | 121.42 | | (dB) | 1.00 | 1.00 | 1.00 | 1.00 | | Optical RX losses (dB) | 6.02 | 6.02 | 6.02 | 6.02 | | RX-power after losses (dBW) | −60.76 | −57.00 | −65.86 | −62.54 |
| | Sensitivity (dBW) | −67.00 | −67.00 | −67.00 | −67.00 | | Margin with sensitivity (dB) | 6.24 | 10.00 | 1.14 | 4.46 |
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