Calculator functions

1
Calculator functions
2
Calculator functions in WRAP

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

3
Geographical calculations

• Conversion of co-ordinates between geographical
  datums
• Distance and bearing between two points
• Free space loss between two points
• Roughness

4
Geographical calculations

• Roughness is defined as the inter-decile height

5
Map Viewer

• Area of a circle or polygon
• Length and bearing of line
• Distance and bearing between points

6
Radio calculations

• Unit conversion, Basic radio propagation, Traffic
  and Cable calculator functions

User defined table
7
Radio calculations, contd

• Effective Earth radius factor according to COST
  210

8
Radio calculations, contd

• 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

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

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

11
Minimum separation calculations

• Iterates until the following expression is
  fulfilled

12
Transmitter calculations

• Occupied bandwidth, (Power above and below
  frequency limits equal to ?/2 of total power)
• Transmitted power (Power within frequency limits)

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

14
Receiver calculations

• Intercept point
• Intermodulation level
• Noise and sensitivity

15
Antenna calculations

• Conversion between antenna gain, lobe width,
  diameter and frequency
• Conversion between the units dBi, dBd and dBv

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)