Linkový výpočet aneb energetická bilance satelitního spoje na GEO

 Je to celkem jednoduché, když tomu jeden rozumí .... stačí mít sw nebo si to vytvořit v excelu.


Produced using Satmaster Pro

Service Name512 kbit/s
CoverageEU/EU
Uplink earth stationPraha, Česko
Downlink earth station
Satellite name5 West 
ModcodManual



Link Input ParametersUpDownUnits
Site latitude50.08N55Ndegrees
Site longitudexx.xx xxdegrees
Site altitude0.2980.095km
Frequency1411.6GHz
PolarizationVerticalHorizontal
Rain modelITU-RITU-R
Rain zone or mm/h35.132.9
Availability (average year)99.899.8%
Antenna aperture2.41.8metres
Antenna efficiency or gain (+ or - prefix)5955% or dBi
Coupling loss0.50.5dB
Antenna mispoint loss0.50.5dB
Other path losses00dB
LNB noise figure or temp (+ prefix)0.8dB or K
Antenna noise53.86K
Csat/ACIo135135dB.Hz
Csat/ASIo121.17120.00dB.Hz
Csat/XPIo144.77120.97dB.Hz
Uplink station HPA output back-off1dB
Uplink power control0dB
Number of carriers / HPA1
HPA C/IMo141.97dB.Hz
Required HPA powerMINW



Satellite Input ParametersValueUnits
Satellite longitude5.00Wdegrees
Transponder typeTWTA
G/T Reference0dB/K
SFD Reference-80dBW/m2
Receive G/T9.56dB/K
Attenuator pad (gain step)0dB
Effective SFD-89.56dBW/m2
Satellite ALC0dB
EIRP (saturation)53.13dBW
Transponder bandwidth36MHz
Input back off total9.2dB
Output back off total3.70dB
C/IM24.00dB



Carrier/Link Input ParametersValueUnits
Modulation8-PSK
Required Eb/No6.8dB
Information rate0.512Mbps
Information rate overhead0%
FEC code rate3/4
Spreading gain0dB
(1 + Roll off factor)1.35
Carrier spacing factor1.3
Bandwidth allocation step size0.01MHz
Implementation loss0dB
System margin1dB



Calculations at SaturationValueUnits
Gain 1m^244.38dB/m2
Uplink C/No104.22dB.Hz
Downlink C/No97.73dB.Hz
Total C/No96.85dB.Hz
Uplink EIRP for saturation73.83dBW



General CalculationsUpDownUnits
Elevation29.7121.91degrees
True azimuth204.69214.63degrees
Compass bearing200.94207.49degrees
Path distance to satellite38637.1239367.93km
XPD during rain32.0730.75dB
Propagation time delay0.1288790.131317seconds
Antenna efficiency59.0055.00%
Antenna gain48.6444.20dBi
Availability (average year)99.899.8%
Link downtime (average year)17.53217.532hours
Availability (worst month)99.29799.297%
Link downtime (worst month)5.1345.134hours
Maximum availability at current HPA power99.824199.7999%
Minimum antenna size at current HPA power1.8000metres



Uplink CalculationClearRain UpRain DnUnits
Uplink transmit EIRP40.8740.8740.87dBW
Transponder input back-off (total)9.209.209.20dB
Input back-off per carrier32.9635.2932.96dB
Antenna mispoint0.500.500.50dB
Free space loss207.11207.11207.11dB
Atmospheric absorption0.160.240.16dB
Tropospheric scintillation fading0.000.300.00dB
Cloud attenuation0.000.410.00dB
Rain attenuation0.001.820.00dB
Total attenuation (gas-rain-cloud-scintillation)0.162.490.16dB
Other path losses0.000.000.00dB
Uplink power control0.000.000.00dB
Uncompensated fade0.002.330.00dB
C/No (thermal)71.2668.9371.26dB.Hz
C/N (thermal)17.6915.3617.69dB
C/ACI48.4646.1348.46dB
C/ASI34.6332.3034.63dB
C/XPI58.2332.0658.23dB
C/IM55.4355.4355.43dB
C/(N+I) [ = Es/(No+Io) ]17.5915.1817.59dB
Eb/(No+Io)14.0711.6514.07dB



Downlink CalculationClearRain UpRain DnUnits
Satellite EIRP total53.1353.1353.13dBW
Transponder output back-off (total)3.703.703.70dB
Output back-off per carrier27.4629.7927.46dB
Satellite EIRP per carrier25.6723.3425.67dBW
Antenna mispoint0.500.500.50dB
Free space loss205.64205.64205.64dB
Atmospheric absorption0.160.160.24dB
Tropospheric scintillation fading0.000.000.39dB
Cloud attenuation0.000.000.41dB
Rain attenuation0.000.001.30dB
Total attenuation (gas-rain-cloud-scintillation)0.160.161.99dB
Other path losses0.000.000.00dB
Noise increase due to precipitation0.000.001.97dB
Downlink degradation (DND)0.000.003.79dB
Total system noise138.19138.19217.58K
Figure of merit (G/T)22.3022.3020.33dB/K
C/No (thermal)70.2667.9366.47dB.Hz
C/N (thermal)16.6914.3612.90dB
C/ACI53.9651.6353.96dB
C/ASI38.9636.6338.96dB
C/XPI39.9337.6030.38dB
C/IM24.0024.0024.00dB
C/(N+I) [ = Es/(No+Io) ]15.9113.8712.49dB
Eb/(No+Io)12.3910.358.97dB



Totals per Carrier (End-to-End)ClearRain UpRain DnUnits
C/No (thermal)67.7265.3965.22dB.Hz
C/N (thermal)14.1511.8211.65dB
C/ACI47.3945.0647.39dB
C/ASI33.2730.9433.27dB
C/XPI39.8730.9930.37dB
C/IM24.0024.0024.00dB
C/I (total)23.3922.5122.68dB
C/(No+Io)67.2365.0364.89dB.Hz
C/(N+I) [ = Es/(No+Io) ]13.6611.4611.32dB
Eb/(No+Io)10.147.947.80dB
Implementation loss0.000.000.00dB
System margin1.001.001.00dB
Net Eb/(No+Io)9.146.946.80dB
Required Eb/(No+Io)6.806.806.80dB
Excess margin2.340.140.00dB



EIRP Density CalculationsClearRain UpRain DnUnits
Flange transmit (up)-61.35-61.35-61.35dBW/Hz
Satellite (down)-27.91-30.24-27.91dBW/Hz
Flange receive (down)-189.51-191.83-193.30dBW/Hz



Earth Station Power RequirementsValueUnits
EIRP per carrier40.87dBW
Antenna gain48.64dBi
Antenna feed flange power per carrier-7.78dBW
Uplink power control0.00dB
HPA output back off1.00dB
Waveguide loss0.5dB
Number of HPA carriers1
Total HPA power required-6.2761dBW
Required HPA power0.2357W



Space Segment UtilizationValueUnits
Overall availability99.6004%
Information rate0.5120Mbps
Information rate (inc overhead)0.5120Mbps
Transmit rate0.6827Mbps
Symbol rate0.2276Mbaud
Noise Bandwidth53.57dB.Hz
Occupied bandwidth0.3072MHz
Minimum allocated bandwidth required0.2958MHz
Allocated transponder bandwidth0.3000MHz
Link efficiency1.707bps/Hz
Percentage transponder bandwidth used0.83%
Used transponder power25.67dBW
Percentage transponder power used0.42%
Max carriers / transponder120.00
Limited by:Bandwidth
Power equivalent bandwidth usage0.1513MHz

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