CHAFF 6.2.9

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12.1. Far Field

The Results available in this menu let the user analyze Far Field results generated by the simulation process.

Far Field options

The following options are available for analysis:

  • View Cuts: this kind of plot compares RCS amplitude for every angle in a phi cut or theta cut sweep.
  • View Cuts by Frequency: this plot compares the measurements for a particular observation point through a frequency sweep.
  • View Cuts by Step: this plot compares the measurements for a particular observation point through every step defined in the project.
  • View Text Files: this option is used to display the contents of the measurements made by the simulation process in a tabular-like structure.

12.1.1. View Cuts

This option is used to analyze information about the calculated 2D Far Fields using the observation directions previously created in the Output menu. When selecting this option, a panel similar to the one presented in the figure will be displayed:

View Cuts panel. Linear plot

There are two kinds of plots analyzed by this result panel: Linear and Polar. By default a Linear plot appears. The plot shows the amplitude of the RCS measurements computed for each angle in a given phi or theta cut. Each series is associated to a given frequency, step, and phi or theta cut. It is also possible to inspect the polar plot by selecting the tab above the plot.

For both plots, an initial cut is added to the plot, but the user can add more series to compare them. In order to show the plot for another cut-frequency-step combination, select the desired frequency and cut and press the “Add Series” button in the Step, Frequency and Cut section at the left control for this panel. The component, either Eθ, Eφ or Et, can also be selected.

It is also possible to change the appearance of a series, displaying points for each angle in the sweep, and changing the color for a series, by selecting it on the List of Series controller and pressing the Change colors button; or delete a series by selecting it on the list of series and pressing the “Remove Series” button. The user can also import new series to be plotted along with the already plotted ones or export them to a text file for later analyzing.

View Cuts panel. Polar plot

12.1.2. View Cuts By Frequency

This kind of plot can be used to compare the amplitude measurements made by the simulation process for a particular component, step, cut and point in the sweep, against a simulation frequency. This option is useful when the user has selected a frequency sweep in the Simulation Settings, in order to inspect how the measurements for a particular observation point change through a frequency sweep.

When this option is chosen from the Show Results > Far Field > View Cuts By Frequency menu, the panel presented in the figure below will appear.

View Cuts by Frequency Panel

View Cuts By Frequency panel.

Similar to the behaviour of the standard Far Field chart, this panel displays a plot with the results, and several options for adding and removing extra series from the plot.

When initially open, the panel will display a default series in the plot that will represent the measurements for a particular component, step, and observation point in a phi or theta cut, against every possible frequency that has been simulated. More series can be added, by selecting component, step and spherical coordinates in the control panel that appears leftside to the plot.

  • Component: the plane wave component to inspect. Select one of the possible values: Eθ, Eφ or Et.
  • Step: the parametric step to select. These should have been defined prior to the calculation when designing the simulation.
  • Theta cut / Phi cut: select one of the theta cuts or phi cuts that were previously added to the project.
  • Point: select a particular observation point in the cut selected before.

The selected series can be added to the plot by pressing the Add Series button. It is also possible to modify the look and delete series previously added to the chart. You can change the color of a particular series by selecting it in the list and pressing the Change Colors. To remove a series from the plot representation, press the Remove series button.

Series can be imported and exported. To save a series press the Export series button. Later it is possible to load previously exported series by pressing the Import Series button and locating the file where the results were saved in.

12.1.3. View Cuts By Step

This kind of plot lets the user analyze RCS measurements made by the simulation provess for a particular component, frequency, theta or phi cut and observation point against the parametric steps defined in the project. This option is useful when the user has parametrized a simulation by adding parameters and making objects such as Chaff clouds depend on the parameters themselves.

When this option is chosen from the Show Results > Far Field > View Cuts by Steps menu, the panel presented below will appear:

View Cuts by Step

View Cuts By Step panel

Similar to the behaviour of the standard Far Field chart, this panel displays a plot with the results and a control panel where the user can add, modify and remove series that are then displayed in the chart. A default series will be added automatically to the plot, but the user can add new series by modifying the values in the control panel and pressing Add Series for adding the series to the panel. The following settings can be modified:

  • Component: the plane wave component to inspect. Select one of the possible values: Eθ, Eφ or Et.
  • Frequency: if a frequency sweep has been made, multiple frequencies may be available for selection.
  • Cuts on phi / Cuts on theta: select one of the cuts that were previously added as observation points to the project.
  • Point: select one of the samples made for this observation direction.

The selected series can be added to the plot by pressing the Add Series button. It is also possible to modify the look and delete series previously added to the chart. You can change the color of a particular series by selecting it in the list and pressing the Change Colors. To remove a series from the plot representation, press the Remove series button.

Series can be imported and exported. To save a series press the Export series button. Later it is possible to load previously exported series by pressing the Import Series button and locating the file where the results were saved in.

12.1.4. View Text Files

This option lets the user inspect the results of the Far Field RCS values in a tabular like structure. Selecting this option will display a panel where the user should select a step and a frequency. To use this section, select a parametric step from the list, and select the frequency to get the results from and press OK to load the data. A table will be presented with the values for this frequency and step. To save the results press the Export button below the table.

Viewing results in text format 

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