Surface Prediction Using IRT

Calculate propagation along non-horizontal prediction planes.

Model type

Propagation along non-horizontal prediction planes and which contain buildings are calculated. Sidewalls of buildings were defined as prediction planes in WallMan.

Tip: Select a wall and from the right-click context menu, change the Wall Type to Prediction Plane to change a wall to a prediction plane.

This database was created as if it is an indoor database, while mainly outdoor propagation is of interest. This was done to define prediction planes and to have more freedom to create general shapes as well as to obtain accurate results inside buildings.

In the .idb file in this project, walls were grouped on a per-building basis.
Tip: Select a building and then click Objects > Disintegrate selected group to select an individual wall in the database.

The database contained in the file, buildings.idb, was preprocessed to use intelligent ray tracing. The preprocessed database is available in the file, buildings.idi.

Sites and Antennas

The project contains a single site with one sector antenna placed at a height of 35 m. The frequency is 2.5 GHz, with a transmitter power of 40 dBm.

Computational Method

The prediction method is set to 3D Intelligent Ray Tracing (IRT - with preprocessed data). As the method name states, the method requires a preprocessed geometry database. The preprocessed database was created in WallMan. Result resolution (10 m) and prediction height (1 m) were specified in WallMan. These two settings can be viewed, but not modified, in ProMan on the Edit Project Parameters dialog, on the Simulation tab.
Tip: Click Project > Edit Project Parameter and click the Computation tab to change the model.

Results

Propagation results show at every location the power received by a hypothetical isotropic antenna. Since some propagation results are on vertical planes, result data are better viewed in the 3D view, see Figure 1. The additional prediction planes can be made visible or hidden from the Additional Result Planes dialog.

Figure 1. Power results.