Java Implementation of Recommendation ITU-R P.368

This code repository contains a Java software implementation of Recommendation ITU-R P.368-10 with a ground-wave propagation prediction method for frequencies between 10 kHz and 30 MHz.

This version of the code is functionally identical to the reference version approved by ITU-R Working Party 3L and published by Study Group 3 on ITU-R SG 3 Software, Data, and Validation Web Page.

This is a translation of the original reference C++ implementation of this Recommendation available at NTIA/LFMF provided by the US National Telecommunications and Information Administration NTIA.

The following table describes the structure of the folder ./src/ containing the Java implementation of Recommendation ITU-R P.368.

File/Folder	Description
main/P368.java	Java class implementing Recommendation ITU-R P.368-10
test/P368Test.java	Java class implementing validation tests against the reference/integral C++ implementation of this Recommendation for a range of input variables.

Function Call

result = tl_p368(htx, hrx, f, Ptx, Ns, d, eps, sigma, pol); ;

Required input arguments of function tl_p368

Variable	Type	Units	Limits	Description
htx	scalar double	m	0 ≤ htx ≤ 50	Height of the transmitter
hrx	scalar double	m	0 ≤ hrx ≤ 50	Height of the receiver
f	scalar double	MHz	0.01 ≤ f ≤ 30	Frequency
Ptx	scalar double	W	0 < Ptx	Transmitter power
Ns	scalar double	N-units	250 ≤ Ptx ≤ 400	Surface refractivity
d	scalar double	km	0 < d	Path distance
eps	scalar double		1 ≤ eps	Relative permittivity
sigma	scalar double	S/m	0 ≤ sigma	Conductivity
pol	scalar int			Polarization 0 = horizontal 1 = vertical

Outputs

Outputs are contained within a defined result structure:

Variable	Type	Units	Description
A_btl__db	double	dB	Basic transmission loss
E__dbuVm	double	dBuV/m	Electric field strength
P_rx__dbm	double	dBm	Electromagnetic field power
method	string		Method used flat-earth curve residue series
error	string		Error message

References

• Recommendation ITU-R P.368

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

• NTIA/LFMF