Gas

Gas propagation model

Description

Model the behavior of electromagnetic radiation from a point of transmission as it travels through gas by using a Gas object. For more information about the model, see [1]. Propagation models for gas are valid from 1 to 1000 GHz, assume line-of-sight (LOS) conditions, and disregard terrain, the curvature of the Earth, and other obstacles.

Creation

Create a Gas object by using the propagationModel function.

Properties

Temperature — Air temperature in °C

15 (default) | scalar

Air temperature in °C, specified as a scalar.

Data Types: double

AirPressure — Dry air pressure in Pa

101300 (default) | scalar

Dry air pressure in Pa, specified as a scalar.

Data Types: double

WaterDensity — Water vapor density in g/m³

7.5 (default) | scalar

Water vapor density in g/m³, specified as a scalar.

Data Types: double

Object Functions

pathloss	Path loss of radio wave propagation
range	Range of radio wave propagation
add	Add propagation models

Examples

Model Coverage in Hot Air

Display the coverage area for a transmitter in hot air. Specify the air temperature as 35 degrees Celsius.

pm = propagationModel("gas","Temperature",35);
tx = txsite("Name","Apple Hill","Latitude",42.3001,"Longitude",-71.3604);
coverage(tx,pm)

References

[1] International Telecommunications Union Radiocommunication Sector. Attenuation by atmospheric gases. Recommendation P.676-11. ITU-R, approved September 30, 2016. https://www.itu.int/rec/R-REC-P.676/en.

[2] Seybold, John S. Introduction to RF Propagation. Hoboken, N.J: Wiley, 2005.

Version History

Introduced in R2019b