Link Budget Analysis

0123-EX-PL-2005 Text Documents

General Dynamics SATCOM Technologies, Inc.

2005-04-27ELS_70451

Digital Link Budget Produced using Satfinder Thursday, November 11, 2004 Service Name Richardson Test Satcom-On-The-Move Coverage CONUS Uplink earth station Richardson, TX Downlink earth station Fort Gordon, GA Satellite name Intelsat 707 Link Input Parameters Uplink Downlink Units Site latitude 32.78N 33.45N degrees Site longitude 96.8W 82.2W degrees Magnetic variation 5.1E 5.1E degrees Site altitude 0.1 0.1 km Frequency 14.2 11.6 GHz Polarization Horizontal Vertical Rain climatic zone (model) E (ITU) E (ITU) Availability (average year) 95 95 % Water vapour density 3 3 gm/m3 Surface temperature 23 23 °C Antenna aperture 2.4 0.6 metres Antenna efficiency / gain +49.2 +35.7 % (+ prefix dBi) Coupling loss 0.5 0.8 dB Antenna tracking / mispoint error 0.1 0.1 dB LNB noise figure / temp +65 dB (+ prefix K) Antenna noise 43 K Adjacent carrier interference 60 60 dB Adjacent satellite interference 65 65 dB Cross polarization interference 30 30 dB Uplink station HPA output back-off 2 dB Number of carriers / HPA 1 HPA C/IM (up) 22 dB Uplink power control 0 dB Uplink filter truncation loss 0 dB Satellite Input Parameters Value Units Satellite longitude 53W degrees Transponder type TWTA Receive G/T 2.9 dB/K Saturation flux density -90.9 dBW/m2 Satellite attenuator pad 1 dB Transmit EIRP at saturation 50.6 dBW Transponder bandwidth 72 MHz Input back off total 4.7 dB Output back off total AUTO dB Intermodulation interference AUTO dB Carrier/Link Input Parameters Value Units Modulation 4-PSK Required bit error rate performance 10^-6 Required Eb/No without FEC coding 10.53 dB

Required Eb/No with FEC coding 3.0 dB Information rate 2.048 Mbps Overhead 0 % FEC code rate 0.477 Spreading gain 0 dB Roll off factor + 1 1.2 Carrier spacing factor 1.4 Bandwidth allocation step size 0.001 MHz System margin 0 dB Calculations at Saturation Value Units Gain 1m^2 44.50 dB/m2 Uplink C/No 97.10 dB.Hz Downlink C/No 86.80 dB.Hz Total C/No 86.41 dB.Hz Uplink EIRP for saturation 73.14 dBW General Calculations Uplink Downlink Units Elevation 29.82 40.10 degrees True azimuth 119.45 134.60 degrees Compass bearing 114.35 129.50 degrees Path distance to satellite 38625.87 37770.41 km Propagation time delay 0.13 0.13 seconds Antenna efficiency 65.21 69.84 % Antenna gain 49.20 35.70 dBi Availability (average year) 95 95 % Link downtime (average year) 438.300 438.300 hours Availability (worst month) 88.439 88.439 % Link downtime (worst month) 84.456 84.456 hours Spectral power density -24.72 3.47 dBW/4kHz Uplink Calculation Clear Rain Up Rain Dn Units Uplink transmit EIRP 52.57 52.57 52.57 dBW Transponder input back-off (total) 4.70 4.70 4.70 dB Input back-off per carrier 20.57 20.88 20.57 dB Mispoint loss 0.10 0.10 0.10 dB Free space loss 207.23 207.23 207.23 dB Atmospheric absorption 0.12 0.12 0.12 dB Tropospheric scintillation fading 0.10 0.10 0.10 dB Atmospheric losses total 0.21 0.21 0.21 dB Total path loss (excluding rain) 207.55 207.55 207.55 dB Rain attenuation 0.00 0.31 0.00 dB UPC (or manual power boost) 0.00 0.00 0.00 dB Uncompensated Rain Fade 0.00 0.31 0.00 dB C/No (thermal) 76.53 76.22 76.53 dB.Hz C/N (thermal) 12.42 12.11 12.42 dB C/ACI 60.00 59.69 60.00 dB C/ASI 65.00 64.69 65.00 dB C/XPI 30.00 29.69 30.00 dB C/IM 22.00 22.00 22.00 dB Eb/(No+Io) 12.89 12.61 12.89 dB Downlink Calculation Clear Rain Up Rain Dn Units

Satellite EIRP total 50.60 50.60 50.60 dBW Transponder output back-off (total) 3.17 3.17 3.17 dB Output back-off per carrier 19.05 19.35 19.05 dB Satellite EIRP per carrier 31.55 31.25 31.55 dBW Mispoint loss 0.10 0.10 0.10 dB Free space loss 205.28 205.28 205.28 dB Atmospheric absorption 0.08 0.08 0.08 dB Tropospheric scintillation fading 0.07 0.07 0.07 dB Atmospheric losses total 0.14 0.14 0.14 dB Total path loss (excluding rain) 205.52 205.52 205.52 dB Rain attenuation 0.00 0.00 0.17 dB Noise increase due to precipitation 0.00 0.00 0.26 dB Downlink degradation (DND) 0.00 0.00 0.43 dB Total system noise 150.59 150.59 159.71 K Figure of merit (G/T) 13.12 13.12 12.87 dB/K C/No (thermal) 67.75 67.44 67.33 dB.Hz C/N (thermal) 3.64 3.34 3.22 dB C/ACI 60.00 59.69 60.00 dB C/ASI 65.00 64.69 65.00 dB C/XPI 30.00 29.69 30.00 dB C/IM 10.77 10.16 10.77 dB Eb/(No+Io) 3.86 3.50 3.50 dB Totals per Carrier (End-to-End) Clear Rain Up Rain Dn Units C/No (thermal) 67.21 66.90 66.83 dB.Hz C/N (thermal) 3.10 2.79 2.72 dB C/ACI 56.99 56.68 56.99 dB C/ASI 61.99 61.68 61.99 dB C/XPI 26.99 26.68 26.99 dB C/IM 10.46 9.88 10.46 dB C/(No+Io) 66.46 66.11 66.14 dB.Hz C/(N+I) 2.35 2.00 2.03 dB Eb/(No+Io) 3.35 3.00 3.03 dB System margin 0.00 0.00 0.00 dB Net Eb/(No+Io) 3.35 3.00 3.03 dB Required Eb/(No+Io) 3.00 3.00 3.00 dB Excess margin 0.35 0.00 0.03 dB Earth Station Power Requirements Value Units EIRP per carrier 52.57 dBW HPA power per carrier 3.37 dBW Uplink power control 0.00 dB HPA output back off 2.00 dB Waveguide loss 0.5 dB Filter truncation loss 0 dB Number of HPA carriers 1 Total HPA power required 5.87 dBW Required HPA power capability 3.87 W Spectral power density -24.72 dBW/4kHz Space Segment Utilization Value Units Overall link availability 90.25 %

Information rate (inc overhead) 2.0480 Mbps Transmit rate 4.2935 Mbps Symbol rate 2.1468 MBaud Occupied bandwidth 2.5761 MHz Noise bandwidth 64.11 dB.Hz Minimum allocated bandwidth required 3.0055 MHz Allocated transponder bandwidth 3.0060 MHz Percentage transponder bandwidth used 4.18 % Used transponder power 31.55 dBW Percentage transponder power used 2.59 % Max carriers by transponder bandwidth 23.95 Max carriers by transponder power 38.65 Maximum carriers limited by:- Transponder bandwidth [23.95 carriers] Total transponder capacity 49.05 Mbps


Document Created: 2019-10-21 21:24:56
Document Modified: 2019-10-21 21:24:56
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC