Post on 13-Jan-2016
transcript
Calculator functions
1WRAP 0966B
Calculator functions in WRAP
• Different calculation functions in different dialogues
• Geographical calculations• General radio calculations• Minimum separation calculations• Transmitter, receiver and antenna
calculations
2WRAP 0966B
Geographical calculations
• Conversion of co-ordinates between geographical datums
• Distance and bearing between two points• Free space loss between two points• Roughness
3WRAP 0966B
Geographical calculations
• Roughness is defined as the inter-decile height
4WRAP 0966B
Map Viewer
• Area of a circle or polygon• Length and bearing of line• Distance and bearing between points
5WRAP 0966B
Radio calculations
• Unit conversion, Basic radio propagation, Traffic and Cable calculator functions
6WRAP 0966B
User defined table
Radio calculations, cont’d
• Effective Earth radius factor according to COST 210
7WRAP 0966B
1 1.5 2 2.5 3 3.5 4 4.5 510
20
30
40
50
60
70
80
90
k
Tim
e pe
rcen
tage
tha
t k
is lo
wer
tha
n th
e ab
scis
sa v
alue
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
8WRAP 0966B
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
9WRAP 0966B
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
10WRAP 0966B
Minimum separation calculations
• Iterates until the following expression is fulfilled
11WRAP 0966B
dBcalculatedIM
requiredI
Sysensitivit
SdB 11
Transmitter calculations
• Occupied bandwidth, (Power above and below frequency limits equal to /2 of total power)
• Transmitted power (Power within frequency limits)
12WRAP 0966B
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
13WRAP 0966B
Receiver calculations
• Intercept point • Intermodulation level• Noise and sensitivity
14WRAP 0966B
Antenna calculations
• Conversion between antenna gain, lobe width, diameter and frequency
• Conversion between the units dBi, dBd and dBv
15WRAP 0966B
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)
16WRAP 0966B