CHAFF 6.2.9

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15.6. Example 6

In this example, we are going to calculate the monostatic RCS of a custom chaff (Ellipsoidal parametric cloud) with a frequency sweep (5 samples from 8 GHz to 12 GHz) using MoM (Method of Moments).

Step 1

First, start newFASANT.

Step 2

Select “File → New” (or, alternatively, press Ctrl+N), and select Chaff from the list of modules by clicking in the following button:

Chaff module button

Step 3

Add a parameter to generate a parametric geometry. Select “Geometry→ Parameters→ Define Step” and enter the parameters as the next figure shows:

Parameters Definition

Step 4

Select “Geometry→ Solid → Ellipsoid”, and enter the same parameters as in the figure:

Ellipsoid command

Step 5

Select “Chaff→ Custom Cloud → Dipole”, and enter the same parameters as in the figure:

Custom Chaff → Dipole menu option

Chaff Parameters and Visualization

Step 6

Select “Simulation → Parameters”, select a frequency sweep from 8 GHz to 12 GHz with 5 samples as shown in the figure and press the “Save” button.

Simulation parameters

Step 7

Select “Solver → Parameters”, leave the default parameters and press the “Save” button.

Solver → Parameters Menu option

Solver parameters

Step 8

Select “RCS → Parameters”. Select “Monostatic RCS” with the default parameters.

RCS → Parameters Menu option

RCS parameters

Step 9

Select “Output → Observation Directions” and introduce the far field observations as in the next Figure. Press the “Save” button.

Output → Observation Directions Menu option

Far Field Observation Directions

Step 10

Select “Meshing → Create Mesh”.

Meshing → Create Mesh Menu option

Step 11

Select 10 divisions in both planar and curved surfaces and the default frequency value. One processor should be enough for the meshing process. Press the “Mesh” button.

Meshing parameters

Step 12

Select “Calculate → Execute”, choose the number of processor used to run the simulation and press the “Execute” button.

Selection of number of processors

Step 13

When the simulation has finished (i.e. the text in the progress bar in the bottom-right corner of the window is “Done.”) we can see the results. Select “Show Results → Far Field → View Cuts” to show the RCS graphic. The user can add more plots by selecting the desired frequency and pressing the “Add Series” button:

RCS graphic

Step 14

Select “Show Results → Far Field → View Cuts ByFrequency” to visualize the relationship of the RCS values and the frequency:

RCS-Frequency graphic

Step 15

Select “Show Results → Far Field → View Text Files”.

Show Results → Far Field → View Text Files menu option

Select one of the frequencies and press the “OK” button.

Far Field Text File panel

Visualizing results in text format

Selecting Monostatic RCS-Frequency files

Visualizing Monostatic RCS-Frequency text file

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