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Title: Spectral notch interference mitigation for stretch processing synthetic aperture radar

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.

Inventors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1568524
Patent Number(s):
10,330,786
Application Number:
15/298,701
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Resource Relation:
Patent File Date: 10/20/2016
Country of Publication:
United States
Language:
English

Citation Formats

Musgrove, Cameron. Spectral notch interference mitigation for stretch processing synthetic aperture radar. United States: N. p., 2019. Web.
Musgrove, Cameron. Spectral notch interference mitigation for stretch processing synthetic aperture radar. United States.
Musgrove, Cameron. Tue . "Spectral notch interference mitigation for stretch processing synthetic aperture radar". United States. https://www.osti.gov/servlets/purl/1568524.
@article{osti_1568524,
title = {Spectral notch interference mitigation for stretch processing synthetic aperture radar},
author = {Musgrove, Cameron},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

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Works referenced in this record:

SAR radar system
patent, October 1999


Waveform synthesis for imaging and ranging applications
patent, December 2004


RFI suppression in SAR
patent, June 2009


Synthetic aperture radar (SAR) imaging system
patent, October 2010


Radar echo processing with partitioned de-ramp
patent, March 2013