Co-notch and independent windowing to mitigate interference in SAR-based imagery
| DWPI Title: System for mitigating distortion in coherent image products generated from synthetic aperture radar (SAR) data for e.g. weather radar station, has processor to generate coherent image based on windowed SAR datasets, and to co-notch datasets |
| Abstract: Various technologies for mitigating distortion in coherent image products generated from SAR data are described herein. Synthetic aperture radar (SAR) datasets generated based upon SAR returns from first and second passes of a SAR platform over a scene are received. The SAR datasets can be co-notched at matching sample indices to improve coherence of SAR images generated from the datasets. Windowed SAR data is generated by applying independent windows to subsets of each of the datasets to reduce sidelobe levels of their image impulse responses. Coherent image products are generated based upon the windowed SAR data, wherein an image quality of the coherent image products is improved as compared to coherent image products generated based upon the SAR datasets. |
| Use: System for mitigating distortion in coherent image products generated from synthetic aperture radar (SAR) data for radio frequency transmitter, weather radar station, TV transmission antenna. |
| Advantage: The sidelobe levels of the impulse responses (IPRs) are reduced without limiting mainlobe distortion, and the quality of coherent image products generated from the windowed SAR data is improved. |
| Novelty: The system has a memory (112) comprising instructions executed by the processor (110). The processor is provided for generating first windowed synthetic aperture radar (SAR) dataset based upon. A first window function is applied to first set of samples in first SAR dataset corresponding to a SAR scan of a scene at a first time. A second window function is applied to a second set of samples in the first SAR dataset. A coherent image product is generated based upon the first windowed SAR dataset and a second SAR dataset that corresponds to a SAR scan of the scene at a second time. The first windowed SAR dataset and the second SAR dataset are co-notched such that the first windowed SAR dataset having zero-valued samples at locations corresponding to zero-valued samples in the second SAR dataset. |
| Filed: 11/17/2016 |
| Application Number: US15354033A |
| Tech ID: SD 13589.1 |
| 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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