| Abstract: | Various technologies for mitigating interference in stretch-processed SAR
imagery are described herein. Stretch-processed SAR data is received at a
computing device. The stretch-processed (or deramped) SAR data is then
reramped, thereby removing frequency-variant components of narrowband
interference signals in the deramped data. A frequency-domain transform
is executed over the reramped data to generate a spectral characteristic
of the reramped data. A spectral notch filter is applied to frequency
bands corresponding to the peaks of the spectral characteristic in order
to filter out the narrowband interference signals. An inverse
frequency-domain transform can then be executed over the filtered
spectral characteristic to return to a phase-history representation of
the SAR data. The phase history resulting from the inverse
frequency-domain transform is a ramped phase history, which can then be
deramped prior to use in connection with generating images of the scanned
scene. |