Urban, IRT

Calculate urban propagation using the rigorous 3D intelligent ray tracing model (IRT).

Model Type

The geometry is described by topography (elevation) and urban buildings. It is a preprocessed database, which means that all visibility relations are already determined in advance. The file size is large, and the discretization and the height of the prediction plane were fixed. However, simulation times are short, which means that you can simulate a variety of antenna positions and antenna patterns easily.

Sites and Antennas

The model has a site with a directional antenna placed at a height of 30 m. The frequency is 1.8 GHz, and the transmitter power is 43 dBm. The antenna pattern used in the simulation is stored in a .apb file. The pattern can be visualized with AMan.

Computational Method

The rigorous 3D IRT computation method is used for this example.
Tip: Click Project > Edit Project Parameter and click the Computation tab to change the model.

This prediction method results in high accuracy due to rigorous 3D ray tracing while requiring a short computation time due to the preprocessing of the database. Preprocessing of the database was performed in WallMan.


The propagation results show at every location the power received by a hypothetical isotropic receiver as well as several other quantities of interest. When viewing the power, you can select to display the rays and observe how a point of interest is reached by several rays that have undergone reflections and diffractions, see Figure 1.

View the delay spread in Figure 2.

Figure 1. The received power and rays displayed in 3D.

Figure 2. The delay spread.