PostProcessing Results in POSTFEKO
After solving the Three_Spheres_VPol_MoM.cfx model, the postprocessing is done in POSTFEKO using the PF_ISAR.lua macro.
 Far field request
 Select the RCS far field request to process.
 Windowing function

 Hamming
 Dirichlet
 Bartlett
 Blackman
 Interpolate to Cartesian grid
 The 2D FFT requires that the X and Y distances should be uniformly spaced. The basic ISAR implementation assumes that the angle range is small enough such that the polar sampling approximates a Cartesian grid. The small angle range assumption can be relaxed by transforming the polar grid to Cartesian. This reduces smearing and shift of the scattering points and increasing accuracy of the resulting ISAR image.
 Component
 Specify which Efield component to use to generate the ISAR result.
Supported options are:
 Theta
 Phi
 LHC (Left Hand Circular)
 RHC (Right Hand Circular)
 Image offset
 Offset distance of the ISAR image above the plane wave workplane.
 Resample factor
 Factor used to up sample the image resolution to create a smoother image with more points. Note it does not change the underlying image resolution based on the frequency and angular information.
 Create 3D view
 Generates a normal view of the partially transparent ISAR image with RCS data displayed in dB.
 Find local maxima
 Calculates the specified number of local maxima in descending order in the ISAR image.
 Export local maxima to CSV
 Export the specified number of local maxima to a CSV file. Find local maxima has to be checked for this to work.
 Number of local maxima
 The number of local maxima to find.
The ISAR images associated with the XY_plane and UV_plane solution configurations are shown below. For this example, a resampling factor of 2 was used with default values for the rest of the input parameters.