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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:
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1568524
Patent Number(s):
10330786
Application Number:
15/298,701
Assignee:
National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING
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}
}

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


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


Imaging Apparatus and Method
patent-application, May 2005


Detection and Mitigation Radio Frequency Memory (DRFM)-Based Interference in Synthetic Aperture Radar (SAR) Images
patent-application, April 2009


Multi-Spot Inverse Synthetic Aperture Radar Imaging
patent-application, May 2009


Method and System for Removal of a Noise in Signal
patent-application, September 2013


Method and System for Estimation and Extraction of Interference Noise from Signals
patent-application, November 2014


Method and System for Jointly Separating Noise from Signals
patent-application, November 2016