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Calculator functions

Calculator functions. Calculator functions in WRAP. Different calculation functions in different dialogues Geographical calculations General radio calculations Minimum separation calculations Transmitter, receiver and antenna calculations. Geographical calculations.

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Calculator functions

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  1. Calculator functions WRAP 0966B

  2. Calculator functions in WRAP • Different calculation functions in different dialogues • Geographical calculations • General radio calculations • Minimum separation calculations • Transmitter, receiver and antenna calculations WRAP 0966B

  3. Geographical calculations • Conversion of co-ordinates between geographical datums • Distance and bearing between two points • Free space loss between two points • Roughness WRAP 0966B

  4. Geographical calculations • Roughness is defined as the inter-decile height WRAP 0966B

  5. Map Viewer • Area of a circle or polygon • Length and bearing of line • Distance and bearing between points WRAP 0966B

  6. Radio calculations • Unit conversion, Basic radio propagation, Traffic and Cable calculator functions User defined table WRAP 0966B

  7. Radio calculations, cont’d • Effective Earth radius factor according to COST 210 WRAP 0966B

  8. Radio calculations, cont’d • Traffic capacity calculations according to the Erlang B and Erlang C formulas • Grade of Service, No of channels, calls per hour or holding time is calculated • For Erlang C waiting time and probability of delay is also calculated • Cable attenuation for different cable lengths and frequencies • Cable data in WRAPdB WRAP 0966B

  9. Minimum separation calculations • Calculates minimum frequency separation between transmitting and receiving station • Transmitter spectrum and receiver selectivity are taken into account • Any propagation model can be used WRAP 0966B

  10. Minimum separation calculations • Calculates minimum distance between transmitting and receiving station • Transmitter spectrum and receiver selectivity are taken into account • Only terrain independent propagation models WRAP 0966B

  11. Minimum separation calculations • Iterates until the following expression is fulfilled WRAP 0966B

  12. Transmitter calculations • Occupied bandwidth, (Power above and below frequency limits equal to /2 of total power) • Transmitted power (Power within frequency limits) WRAP 0966B

  13. Transmitter calculations • Generation of modulation spectrum • AM and FM assumed to be Gaussian • M-ary PSK and M-ary QAM with raised cosine roll-off filter • MSK • GMSK WRAP 0966B

  14. Receiver calculations • Intercept point • Intermodulation level • Noise and sensitivity WRAP 0966B

  15. Antenna calculations • Conversion between antenna gain, lobe width, diameter and frequency • Conversion between the units dBi, dBd and dBv WRAP 0966B

  16. Satellite calculations • Azimuth, elevation and distance between earth station and satellite • Satellite visibility check • Visibility of the geostationary orbit • Antenna noise (according to ITU-R SA.1017) WRAP 0966B

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