MATLAB/Octave Implementation of Recommendation ITU-R P.528

This code repository contains a MATLAB/Octave software implementation of Recommendation ITU-R P.528-5 with a propagation prediction method for aeronautical mobile and radionavigation services in the frequency range 100 - 30000 MHz.

This is a translation of the original reference C++ implementation of this Recommendation available at NTIA/p528 provided by the US National Telecommunications and Information Administration NTIA. This version of the code corresponds to the reference MATLAB/Octave version approved by ITU-R Working Party 3K and published by Study Group 3 on ITU-R SG 3 Software, Data, and Validation Web Page.

The following table describes the structure of the folder ./matlab/ containing the MATLAB/Octave implementation of Recommendation ITU-R P.528.

| File/Folder | Description | |----------------------------|---------------------------------------------------------------------| |tl_p528.m | MATLAB function implementing Recommendation ITU-R P.528-5 | |validate_p528.m | MATLAB script used to validate the implementation of Recommendation ITU-R P.528-5 against the reference results provided in the subfolder ./Data Tables |

Function Call

result = tl_p528(d__km, h_1__meter, h_2__meter, f__mhz,  T_pol, p);

Required input arguments of function tl_p528

| Variable | Type | Units | Limits | Description | |-------------------|--------|-------|--------------|--------------| | d__km | scalar double | km | 0 < d | Great circle path distance between terminals | | h_1__meter | scalar double | m | 1.5 ≤ h_1__meter ≤ 20000 | Height of the low terminal | | h_2__meter | scalar double | m | 1.5 ≤ h_2__meter ≤ 20000 | Height of the high terminal | | f__mhz | scalar double | MHz | 100 ≤ f__mhz ≤ 30000 | Frequency| | T_pol | scalar int | | | Polarization <br> 0 = horizontal <br> 1 = vertical | | p | scalar double | % | 1 ≤ p ≤ 99 | Time percentage|

Outputs

Outputs are contained within a defined result structure:

| Variable | Type | Units | Description | |------------|--------|-------|-------------| | A__db | double | dB | Basic transmission loss | | d__km | double | km |Great circle path distance. Could be slightly different than specified in input variable if within LOS region | | A_fs__db | double | dB | Free-space basic transmission loss | | A_a__db | double | dB | Median atmospheric absorption loss | | theta_h1__rad | double | rad | Elevation angle of the ray at the low terminal| | propagation_mode | int | | Mode of propagation <br>1 = Line of Sight<br> 2 = Diffraction<br> 3 = Troposcatter| | rtn | int | | Return flags / Error codes|

Software Versions

The code was tested and runs on:

• MATLAB versions 2017a and 2020a
• Octave version 6.1.0

References

• Recommendation ITU-R P.528

• ITU-R SG 3 Software, Data, and Validation Web Page

• NTIA/p528