To address the issue with your MATLAB code and the Longley-Rice (Irregular Terrain Model) pathloss calculations, you need to switch from using Cartesian coordinates to geographic coordinates (latitude, longitude). Here's how you might adjust your code:
% initialize model
pm_lr = propagationModel("longley-rice", 'ClimateZone', 'maritime-over-sea', 'GroundPermittivity', 68, 'GroundConductivity', 5.5);
% create tx site with geographic coordinates (latitude, longitude, altitude)
% Replace 'Lat1', 'Lon1', and 'Alt1' with the actual values for the transmitter.
tx = txsite('Name', 'TX1', 'Latitude', Lat1, 'Longitude', Lon1, 'AntennaHeight', 1, 'TransmitterFrequency', 101.5e6, 'TransmitterPower', 1);
% create rx site with geographic coordinates
% Replace 'Lat2', 'Lon2', and 'Alt2' with the actual values for the receiver.
rx = rxsite('Name', 'RX', 'Latitude', Lat2, 'Longitude', Lon2, 'AntennaHeight', 1);
% calculate the loss
[tx_loss, tx_info] = pathloss(pm_lr, rx, tx, 'Map', 'none');
In this adjusted version of your code:
- Replace 'Lat1', 'Lon1', and 'Alt1' with the latitude, longitude, and altitude of your transmitter site.
- Replace 'Lat2', 'Lon2', and 'Alt2' with the latitude, longitude, and altitude of your receiver site.
This approach uses geographic coordinates, which the Longley-Rice model requires to account for terrain variations and other environmental factors in its path loss calculations. Make sure the latitude and longitude are in decimal degrees and the altitude is in meters.
Please ensure that you have the correct geographic coordinates for your transmitter and receiver. The altitude can be set relative to the ground level or sea level, depending on your specific scenario and the expected precision.
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