Spectral notch interference mitigation for stretch processing synthetic aperture radar
| DWPI Title: Computing system for performing spectral notch interference mitigation for stretch processing, has processor for outputting synthetic aperture radar phase history data based upon filtered spectral characteristic |
| 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. |
| Use: Computing system for performing spectral notch interference mitigation for stretch processing using SAR. |
| Advantage: The system analyzes stretch-processed echo return pulses received from the SAR data system, and identifies and filters interference signals using a spectral notch filter, thus potentially reducing cost and complexity of radar processing equipment in an efficient manner. |
| Novelty: The system (100) has a processor (110) for ramping stretch-processed synthetic aperture radar (SAR) data in responsive to receiving SAR data. The processor applies a frequency-domain transform to the ramped SAR data to generate a spectral characteristic of the ramped SAR data. The processor applies a notch filter to a frequency band corresponding to a peak of the spectral characteristic of the ramped SAR data to generate a filtered spectral characteristic of the ramped SAR data, and outputs SAR phase history data based upon the filtered spectral characteristic. |
| Filed: 10/20/2016 |
| Application Number: US15298701A |
| Tech ID: SD 13586.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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