CHAFF 6.2.9

15.3. Example 3

In this example, we are going to calculate the monostatic RCS of rectangular chaff with a frequency sweep using Domain Decomposition.

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

Select “Geometry → Rectangular Chaff” and enter the same parameters as shown in the figure:

Rectangular Chaff Menu option

Rectangular chaff parameters and visualization

Step 4

Select “Simulation → Parameters”, select a frequency sweep from 3 GHz to 5 GHz with 3 samples, as shown in the figure and press the “Save” button.

Simulation parameters (frequency sweep)

Step 5

Select “Solver → Parameters”.Select the “Domain Decomposition” method and leave the default parameters. Press the “Save” button.

Solver parameters (Domain Decomposition)

Step 6

Select “RCS → Parameters”. Select “Monostatic RCS” with the default parameters and press the “Save” button.

RCS parameters panel

Step 7

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

Far Field Observation Directions

Step 8

Select “Meshing → Create Mesh”.

Meshing → Create Mesh Menu option

Step 9

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 10

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

Selection of number of processors

Step 11

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:

Show Results → Far Field → View Cuts Menu option

RCS graph for the first sampled frequency (3.0 GHz)

Step 12

As we see, only the graph for the results of the first sampled frequency is plotted. To compare the results for different frequencies, select the “4.0E9” frequency and press the “Add Series” button. Then, select the “5.0E9” frequency and press the “Add Series” button again. Now we can see the results for the three frequencies:

RCS graphic of all sampled frequencies

Step 13

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

RCS-Frequency graphic

Step 14

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

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