Digital Link Budget Analysis

0390-EX-ST-2005 Text Documents

General Dynamics SATCOM Technologies, Inc.

2005-07-05ELS_71692

Digital Link Budget Produced using Satfinder Thursday, June 30, 2005 Service Name Richardson Test Satcom-On-The-Move Coverage CONUS Uplink earth station Dallas Downlink earth station Dallas Satellite name Horizons 1 Link Input Parameters Uplink Downlink Units Site latitude 32.78N 32.78N degrees Site longitude 96.80W 96.80W degrees Magnetic variation 5.0E 5.0E degrees Site altitude 0.1 0.1 km Frequency 14.2 11.9 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 0.6 2.4 metres Antenna efficiency / gain +37.3 +47.4 % (+ prefix dBi) Coupling loss 1.2 0.1 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 127.0W degrees Transponder type TWTA Receive G/T 2.0 dB/K Saturation flux density -91.1 dBW/m2 Satellite attenuator pad 1 dB Transmit EIRP at saturation 49 dBW Transponder bandwidth 36 MHz Input back off total 7.6 dB Output back off total AUTO dB Intermodulation interference AUTO dB Carrier/Link Input Parameters Value Units Modulation BPSK Required bit error rate performance 10^-6 Required Eb/No without FEC coding 10.53 dB

Required Eb/No with FEC coding 2.8 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 96.00 dB.Hz Downlink C/No 98.59 dB.Hz Total C/No 94.09 dB.Hz Uplink EIRP for saturation 72.71 dBW General Calculations Uplink Downlink Units Elevation 39.95 39.95 degrees True azimuth 227.07 227.07 degrees Compass bearing 222.07 222.07 degrees Path distance to satellite 37782.47 37782.47 km Propagation time delay 0.13 0.13 seconds Antenna efficiency 67.37 61.35 % Antenna gain 37.30 47.40 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 -22.22 -5.83 dBW/4kHz Uplink Calculation Clear Rain Up Rain Dn Units Uplink transmit EIRP 46.17 46.17 46.17 dBW Transponder input back-off (total) 7.60 7.60 7.60 dB Input back-off per carrier 26.53 26.82 26.53 dB Mispoint loss 0.10 0.10 0.10 dB Free space loss 207.04 207.04 207.04 dB Atmospheric absorption 0.09 0.09 0.09 dB Tropospheric scintillation fading 0.08 0.08 0.08 dB Atmospheric losses total 0.17 0.17 0.17 dB Total path loss (excluding rain) 207.31 207.31 207.31 dB Rain attenuation 0.00 0.29 0.00 dB UPC (or manual power boost) 0.00 0.00 0.00 dB Uncompensated Rain Fade 0.00 0.29 0.00 dB C/No (thermal) 69.47 69.18 69.47 dB.Hz C/N (thermal) 2.35 2.06 2.35 dB C/ACI 60.00 59.71 60.00 dB C/ASI 65.00 64.71 65.00 dB C/XPI 30.00 29.71 30.00 dB C/IM 22.00 22.00 22.00 dB Eb/(No+Io) 6.30 6.01 6.30 dB Downlink Calculation Clear Rain Up Rain Dn Units

Satellite EIRP total 49.00 49.00 49.00 dBW Transponder output back-off (total) 4.79 4.79 4.79 dB Output back-off per carrier 23.73 24.01 23.73 dB Satellite EIRP per carrier 25.27 24.99 25.27 dBW Mispoint loss 0.10 0.10 0.10 dB Free space loss 205.50 205.50 205.50 dB Atmospheric absorption 0.08 0.08 0.08 dB Tropospheric scintillation fading 0.06 0.06 0.06 dB Atmospheric losses total 0.14 0.14 0.14 dB Total path loss (excluding rain) 205.74 205.74 205.74 dB Rain attenuation 0.00 0.00 0.19 dB Noise increase due to precipitation 0.00 0.00 0.42 dB Downlink degradation (DND) 0.00 0.00 0.61 dB Total system noise 113.76 113.76 125.31 K Figure of merit (G/T) 26.74 26.74 26.32 dB/K C/No (thermal) 74.87 74.58 74.26 dB.Hz C/N (thermal) 7.75 7.46 7.14 dB C/ACI 60.00 59.71 60.00 dB C/ASI 65.00 64.71 65.00 dB C/XPI 30.00 29.71 30.00 dB C/IM 3.50 2.93 3.50 dB Eb/(No+Io) 6.11 5.62 5.94 dB Totals per Carrier (End-to-End) Clear Rain Up Rain Dn Units C/No (thermal) 68.37 68.08 68.22 dB.Hz C/N (thermal) 1.25 0.96 1.10 dB C/ACI 56.99 56.70 56.99 dB C/ASI 61.99 61.70 61.99 dB C/XPI 26.99 26.70 26.99 dB C/IM 3.44 2.87 3.44 dB C/(No+Io) 66.31 65.91 66.22 dB.Hz C/(N+I) -0.81 -1.21 -0.90 dB Eb/(No+Io) 3.19 2.80 3.11 dB System margin 0.00 0.00 0.00 dB Net Eb/(No+Io) 3.19 2.80 3.11 dB Required Eb/(No+Io) 2.80 2.80 2.80 dB Excess margin 0.39 0.00 0.31 dB Earth Station Power Requirements Value Units EIRP per carrier 46.17 dBW HPA power per carrier 8.87 dBW Uplink power control 0.00 dB HPA output back off 2.00 dB Waveguide loss 1.2 dB Filter truncation loss 0 dB Number of HPA carriers 1 Total HPA power required 12.07 dBW Required HPA power capability 16.12 W Spectral power density -22.22 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 4.2935 MBaud Occupied bandwidth 5.1522 MHz Noise bandwidth 67.12 dB.Hz Minimum allocated bandwidth required 6.0109 MHz Allocated transponder bandwidth 6.0110 MHz Percentage transponder bandwidth used 16.70 % Used transponder power 25.27 dBW Percentage transponder power used 1.28 % Max carriers by transponder bandwidth 5.99 Max carriers by transponder power 78.20 Maximum carriers limited by:- Transponder bandwidth [5.99 carriers] Total transponder capacity 12.27 Mbps


Document Created: 2019-11-02 03:04:10
Document Modified: 2019-11-02 03:04:10
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