POSTFEKO Results
The images below show some results obtained by using different post-processing options available in the script.
Figure 1. ISAR image with no post-processing of the RCS data.
The angular smear away from the image origin can be reduced by transforming the polar data to Cartesian coordinates using bi-linear interpolation. The ISAR image with a polar to Cartesian transformation for a view angle phi0 = 45° and angular range of 24° is shown. The down-range and cross-range resolutions are 0.0382 m and 0.0435 m, respectively.
Figure 2. ISAR image with a polar to Cartesian transformation.
The image can be processed further by windowing the RCS data. The next ISAR image is the result of using a polar to Cartesian transformation and a Hamming window for a view angle phi0 = 45° and angular range of 24°. The down-range and cross-range resolutions are 0.0382 m and 0.0435 m, respectively.
Figure 3. ISAR image with a polar to Cartesian transformation and using a Hamming window.
The application macro can be used to change the view angle and the angular range. The ISAR image below is obtained using a polar to Cartesian transformation and a Hamming window for a view angle phi0 = 37.33° and an angular range of 38.67°. The down-range and cross-range resolutions are 0.0408 m and 0.0265 m, respectively.
Figure 4. ISAR image with a polar to Cartesian transformation and using a Hamming window with a different view angle.