</table>
== Running SBR Ray Tracing Simulations in EM.Terrano ==Â === Simulation Types and Modes ===Â EM.Terrano provides a number of different solvers and simulation modes. Its main solver is the '''3D SBR Ray Tracer'''. Once you have set up your propagation scene in EM.Terrano and have defined sources/transmitters and observables/receivers for your scene, you are ready to run a SBR ray tracing simulation. EM.Terrano offers thee simulation modes for the SBR solver: Â {| class="wikitable"|-! scope="col"| Simulation Mode! scope="col"| Usage! scope="col"| Number of Engine Runs! scope="col"| Frequency ! scope="col"| Restrictions|-| style="width:120px;" | [[#Running a Single-Frequency SBR Analysis | Single-Frequency Analysis]]| style="width:250px;" | Simulates the propagation scene "As Is"| style="width:100px;" | Single run| style="width:150px;" | Runs at the center frequency fc| style="width:100px;" | None|-| style="width:120px;" | [[Parametric_Modeling_%26_Simulation_Modes_in_EM.Cube#Running_Frequency_Sweep_Simulations_in_EM.Cube | Frequency Sweep]]| style="width:250px;" | Varies the operating frequency of the ray tracer | style="width:100px;" | Single ray tracing run, multiple frequency computations | style="width:150px;" | Runs at a specified set of frequency samples| style="width:100px;" | None|-| style="width:120px;" | [[Parametric_Modeling_%26_Simulation_Modes_in_EM.Cube#Running_Parametric_Sweep_Simulations_in_EM.Cube | Parametric Sweep]]| style="width:250px;" | Varies the value(s) of one or more project variables| style="width:100px;" | Multiple runs| style="width:150px;" | Runs at the center frequency fc| style="width:100px;" | None|}Â You set the simulation mode in EM.Terrano's simulation run dialog. A single-frequency analysis is a single-run simulation. The two other simulation modes in the above list are considered multi-run simulations. If you run a simulation without having defined any observables, no data will be generated at the end of the simulation. In multi-run simulation modes, certain parameters are varied and a collection of simulation data files are generated. At the end of a sweep simulation, you can plot the output parameter results on 2D graphs or you can animate the 3D simulation data from the navigation tree. Â {{Note| EM.Terrano's frequency sweep simulations are very fast because the geometrical optics (ray tracing) part of the simulation is frequency-independent.}}
=== Running a Single-Frequency SBR Analysis ===
EM.Terrano provides a number of different solvers and simulation modes. Its main solver is the '''3D SBR Ray Tracer'''. Once you have set up your propagation scene in EM.Terrano and have defined sources/transmitters and observables/receivers for your scene, you are ready to run a SBR ray tracing simulation. You set the simulation mode in EM.Terrano's simulation run dialog. A single-frequency SBR analysis is a single-run simulation and the simplest type of ray tracing simulation and in EM.Terrano. It involves the following steps:
* Set the units of your project and the frequency of operation. Note that the default project unit is '''millimeter'''. Wireless propagation problems usually require meter, mile or kilometer as the project unit.
You can also set the '''Angular Resolution''' of the transmitter rays in degrees. By default, every transmitter emanates equi-angular ray tubes at a resolution of 1 degree. Lower angular resolutions larger than 1° speed up the SBR simulation significantly, but they may compromise the accuracy. Higher angular resolutions less than 1° increase the accuracy of the simulating results, but they also increase the computation time. The SBR Engine Settings dialog also shows the required '''Minimum Angular Resolution''' in degrees in a greyed-out box. This number is calculated based on the overall extents of your computational domain as well as the SBR mesh resolution. To see this value, you have to generate the SBR mesh first. Keeping the angular resolution of your project above this threshold value makes sure that the small mesh facets at very large distances from the source would not miss any impinging ray tubes during the simulation.
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=== Simulation Types and Modes ===
Â
EM.Terrano provides a number of different solvers and simulation modes. Its main solver is the '''3D SBR Ray Tracer'''. Once you have set up your propagation scene in EM.Terrano and have defined sources/transmitters and observables/receivers for your scene, you are ready to run a SBR ray tracing simulation. EM.Terrano offers thee simulation modes for the SBR solver:
Â
{| class="wikitable"
|-
! scope="col"| Simulation Mode
! scope="col"| Usage
! scope="col"| Number of Engine Runs
! scope="col"| Frequency
! scope="col"| Restrictions
|-
| style="width:120px;" | [[#Running a Single-Frequency SBR Analysis | Single-Frequency Analysis]]
| style="width:250px;" | Simulates the propagation scene "As Is"
| style="width:100px;" | Single run
| style="width:150px;" | Runs at the center frequency fc
| style="width:100px;" | None
|-
| style="width:120px;" | [[Parametric_Modeling_%26_Simulation_Modes_in_EM.Cube#Running_Frequency_Sweep_Simulations_in_EM.Cube | Frequency Sweep]]
| style="width:250px;" | Varies the operating frequency of the ray tracer
| style="width:100px;" | Single ray tracing run, multiple frequency computations
| style="width:150px;" | Runs at a specified set of frequency samples
| style="width:100px;" | None
|-
| style="width:120px;" | [[Parametric_Modeling_%26_Simulation_Modes_in_EM.Cube#Running_Parametric_Sweep_Simulations_in_EM.Cube | Parametric Sweep]]
| style="width:250px;" | Varies the value(s) of one or more project variables
| style="width:100px;" | Multiple runs
| style="width:150px;" | Runs at the center frequency fc
| style="width:100px;" | None
|}
Â
You set the simulation mode in EM.Terrano's simulation run dialog. A single-frequency analysis is a single-run simulation. The two other simulation modes in the above list are considered multi-run simulations. If you run a simulation without having defined any observables, no data will be generated at the end of the simulation. In multi-run simulation modes, certain parameters are varied and a collection of simulation data files are generated. At the end of a sweep simulation, you can plot the output parameter results on 2D graphs or you can animate the 3D simulation data from the navigation tree.
Â
{{Note| EM.Terrano's frequency sweep simulations are very fast because the geometrical optics (ray tracing) part of the simulation is frequency-independent.}}
== Working with EM.Terrano's Simulation Data ==