The following outlines the process that Intelpath undergoes when doing an Rf study to obtain a channel.

    Read path data to be studied for interference analysis.
        Latitude/Longitude
        Transmit Power
        AGL
        Antenna Gain
        Receiver Threshold
        Ground Elevation
        T/I Objective


    Read path data from database one by one and make comparison.
        Transmit Power
        Antenna Gain
        Receiver Threshold
        T/I Objective
        T/I Objective


Calculate azimuth, back azimuth, and path distance by inverse position method of calculation. Back azimuth is an azimuth 180* from a given azimuth. Inverse distance is used to compute the geodetic azimuth and ellipsoidal distance between two points given their latitudes and longitudes in degrees, minutes, and seconds. 

    • Station 1 – station 2
    • Station 1 – station 3
    • Station 1 – station 4
    • Station 2 – station 3
    • Station 2 – station 4
  1. Calculate free space loss of above paths.
    • Station 1 – station 2
    • Station 1 – station 3
    • Station 1 – station 4
    • Station 2 – station 3
    • Station 2 – station 4
  2. Calculate receive levels of each path using transmit power, transmitting antenna gain, path loss, and receiving antenna gain. It should be noted that antenna discrimination of the interference paths has not been included at this point.
  3. Calculate the discrimination angles between the normal transmission path and the interference paths. Then by using the antenna type specified in the antenna database the antenna discrimination is determined.
  4. The C/I radios are calculated for the following paths. The ratio is determined by calculating the ratio of received signal of victim path over sum of interfering transmit power, interfering antenna gain, free space path loss and victim antenna gain, negating antenna discrimination.
    • Station 1 to Station 2 into Station 4 from Station 3
    • Station 1 to Station 2 into Station 3 from Station 4
    • Station 2 to Station 1 into Station 4 from Station 3
    • Station 2 to Station 1 into Station 3 from Station 4
    • Station 3 to Station 4 into Station 1 from Station 2
    • Station 3 to Station 4 into Station 2 from Station 1
    • Station 4 to Station 3 into Station 1 from Station 2
    • Station 4 to Station 3 into Station 2 from Station 1
  5. Calculate C/I objective by calculating the ratio of received signal level of victim path over sum of receiver threshold and T/I objective.
  6. All calculated C/I ratios not meeting the required objectives are reported.