OLSG Report_Final_06_05_12 - Interagency Operations Advisory ...
OLSG Report_Final_06_05_12 - Interagency Operations Advisory ...
OLSG Report_Final_06_05_12 - Interagency Operations Advisory ...
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Optical Link Study Group (<strong>OLSG</strong>) <strong>Final</strong> <strong>Report</strong><br />
IOAG.T.<strong>OLSG</strong>.20<strong>12</strong>.V1<br />
3.4.5.2 Uplink Budget<br />
Figure 36 presents a sample uplink budget for a lunar mission. The irradiance required at<br />
the receiver aperture is based on the acquisition procedure of LLCD. The calculation shows<br />
a good margin on the beacon link.<br />
M OON UPLINK BUDGET<br />
INPUT PARAM ETERS<br />
LINK BUDGET<br />
Slant Range 384.0E+03 km Tx Ave Power 40.00 dBm<br />
Elevation 30 deg<br />
Tx Antenna Gain<br />
109.66 dBi<br />
TRANSMITTER<br />
Tx Array Gain<br />
6.02 dBi<br />
Tx Wavelength 1.55 µm Tx Transmission Loss -3.34 dB<br />
Tx Ave Power 10.0 W Tx Pointing Loss -1.56 dB<br />
EIRP<br />
<strong>12</strong>0.78 dBW<br />
Tx Array Size 4 apertures Isotropic Space Loss -309.86 dB<br />
Tx Aperture Diam 0.15 m Atmospheric Loss -1.94 dB<br />
Tx Angular Diam 2.71 arcsec<br />
Tx Footprint Diam 5.<strong>05</strong>E+03 m Irradiance at rx aperture 4<strong>12</strong>.6E-09 W /m^2<br />
Tx Optical Transmission 46.3 % Rx Antenna Gain 1<strong>06</strong>.77 dBi<br />
Tx Depointing 0.80 arcsec Rx Array Gain 0.00 dB<br />
Rx Transmission Loss<br />
-4.81 dB<br />
ATMOSPHERIC LOSSES Rx Pointing Loss -1.24 dB<br />
Atm Zenith Transmittance 95.0 % Total Optical Path Loss -100.32 dB<br />
Relative Airmass 1.99<br />
Atm Transmission Along LOS 90.3 % Ave Power at Rx Detector -60.32 dBm<br />
Scintillation Loss -1.5 dB<br />
Req. Irradiance at rx aperture 63.0E-09 W/m^2<br />
RECEIVER Link M argin (Irradiance) 8.16 dB<br />
Rx Aperture Diam 0.11 m<br />
Rx FOV 5.00 arcsec<br />
Rx Depointing 3.50 arcsec<br />
Rx Optical Transmission 33.0 %<br />
Rx Array Size 1 apertures<br />
Req. Irradiance at rx aperture<br />
63.0E-09 W/m^2<br />
Figure 36: Example uplink budget for the Lunar Scenario<br />
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