Java Implementation of Recommendation ITU-R P.452

This code repository contains a Java software implementation of Recommendation ITU-R P.452-18 with a prediction procedure for the evaluation of interference between stations on the surface of the Earth at frequencies above about 0.1 GHz.

This version of the code is functionally identical to the reference version approved by ITU-R Working Party 3M 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 ./src/ containing the Java implementation of Recommendation ITU-R P.452.

File/Folder	Description
main/P452.java	Java class implementing Recommendation ITU-R P.452-18
test/P452Test.java	Java class implementing validation tests against the reference MATLAB/Octave implementation of this Recommendation for a range of input variables.

Integrating ITU Digital Products

This software uses ITU digital products that are integral part of Recommendations. These products must not be reproduced or distributed without explicit written permission from the ITU.

Download and extract the required maps to ./src/maps:

• From ITU-R P.452-18:
  • DN50.TXT
  • N050.TXT

Function Call

Lb = tl_p452(maps, f, p, d, h, g, zone, htg, hrg, phit_e, phit_n, phir_e, phir_n, Gt, Gr, pol, dct, dcr, press, temp)

Required input arguments of function tl_p452

Variable	Type	Units	Limits	Description
maps	class P452DigitalMaps			Object containing all the digital maps (DN50, N050) necessary for computation
f	scalar double	GHz	~0.1 ≤ f ≤ ~50	Frequency
p	scalar double	%	0.001 ≤ p ≤ 50	Time percentage for which the calculated basic transmission loss is not exceeded
d	array double	km	0 < max(d) ≤ ~10000	Terrain profile distances (in the ascending order from the transmitter)
h	array double	m (asl)		Terrain profile heights
g	array double	m (asl)		Clutter + Terrain profile heights
zone	array int		1 - Coastal Land, 2 - Inland, 3 - Sea	Radio-climatic zone types
htg	scalar double	m		Tx antenna height above ground level
hrg	scalar double	m		Rx antenna height above ground level
phit_e	scalar double	deg	0 ≤ phit_e ≤ 360 or -180 ≤ phit_e ≤ 180	Tx longitude
phit_n	scalar double	deg	-90 ≤ phit_n ≤ 90	Tx latitude
phir_e	scalar double	deg	0 ≤ phir_e ≤ 360 or -180 ≤ phir_e ≤ 180	Rx longitude
phir_n	scalar double	deg	-90 ≤ phir_n ≤ 90	Rx latitude
Gt, Gr	scalar double	dBi		Tx/Rx antenna gain in the direction of the horizon towards along the great-circle interference path.
pol	scalar int		pol = 1, 2	Polarization of the signal: 1 - horizontal, 2 - vertical
dct	scalar double	km	dct ≥ 0	Distance over land from the Tx antenna to the coast along the great-circle interference path. To be set to zero for a terminal on a ship or sea platform.
dcr	scalar double	km	dcr ≥ 0	Distance over land from the Rx antenna to the coast along the great-circle interference path. To be set to zero for a terminal on a ship or sea platform.
press	scalar double	hPa		Dry air pressure.
temp	scalar double	deg C		Air temperature.

Outputs

Variable	Type	Units	Description
Lb	double	dB	Basic transmission loss

References

• Recommendation ITU-R P.452

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

• MATLAB/Octave Implementation of Recommendation ITU-R P.452

• SEAMCAT - Spectrum Engineering Advanced Monte Carlo Analysis Tool