15.2. Example 2

In this example, we will calculate the Bistatic RCS of an imported geometry using a frequency sweep from 0.4 GHz to 0.6 GHz.

Step 1

Create a new newFASANT project (using the MONCROS module) following the steps 1 to 3 in the first example (Example 1).

Step 2

Select Geometry → Import Geometry (alternatively press Ctrl+I).

Geometry menu

Step 3 

Select the geometry to import (Satellite.igs) and press Open.

Importing geometry

Imported geometry

Step 4 

Select the Simulation → Parameters option. Enable the Frequency Sweep option and set the initial frequency to 0.4 GHz and the final frequency to 0.6 GHz. Set the number of samples to 3 (the frequencies will be 0.4 GHz, 0.5 GHz and 0.6 GHz) and left-click the Save button.

Simulation parameters

Step 5

To set up the solver parameters, follow Step 8 of the Example 1 and follow the next step, making sure to comply with the final warning.

Step 6

Select the RCS → Parameters option. In the panel that appears, select the Bistatic RCS option and leave the default values for the remaining options. Press the Save button.

RCS parameters

WARNING: return to ‘Advanced Options’ of the solver, disable ‘Rigorous Calculate’ option and enable ‘Compute Pattern 3D’ option with the angle value for 0.5 degrees as default.

Step 7 

Select the Output → Observation Directions option. Modify the existing phi cut and set it to 45º. Leave the remaining fields intact. Press the OK button.

Observation Directions panel

Step 8 

Select the Output → Observation Points option. The following panel will be shown:

Observation Points panel

Select the Line option from the Geometry Types combo-box and left-click the Add button. In the dialog that appears, configure the parameters as shown in the next figure and press the OK button:

Observation Line parameters


Observation line visualization

Step 9 

Select Meshing → Create Mesh. Set the options as shown in the following figure:

Meshing options


Visualizing the created mesh

Step 10 

Select Calculate → Execute and set the number of processors that will be used for the simulation. Press the Execute button to start the simulation.

Calculate options

Step 11 

After the simulation finishes, select the option Show Results → Far Field → View Cuts.

RCS graphic

Initially, only the RCS for the first sampled frequency will be plotted. The user can add more series by selecting a different frequency in the Frequencies combo-box and left-clicking the Add Series button.

Step 12 

Select Show Results → Far Field → View Text Files. Select the frequency to display the results for and left-click the OK button.

Far Field Text File options

Viewing RCS results in text format

Step 13 

Select the Show Results → Near Field → View Near Field. Select the observation points to show (in our case, “line_0”) and press the OK button.

View Near Field panel

Near Field representation

Step 14 

Select the Show Results → View Currents option.

Current Density representation 

Step 15 

Select the Show Results → View Charge option.

Charge Density representation

Step 16 

Select the Show Results → RCS Diagram → View RCS 3D option.

RCS 3D Representation


Step 17

Select Materials → Add option.

Add material panel


Step 18

Select Material defined by Geometry option and press the Set Parameters button, to configure as shown the material properties.

Geometry material parameters


Step 19

Select the geometry on the screen and click on Material Assign to assign the new material to those surfaces. Choose the material and specified the thicknes.

Geometry selection

Assign material parameters

Step 20

Mesh the geometry and run the simulation again.


Step 21

Select the option Show Results → Far Field → View Cuts.

RCS graphic


Step 22

Select the Show Results → View Currents option.

Current Density representation


Step 23

Select the Show Results → View Charge option.

Charge Density representation

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