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Title: Synthetic-aperture radar (SAR) imaging with range-resolved reflection data

Abstract

SAR imaging may be performed with range-resolved reflection data, where a spread-spectrum signal, such as a code division multiple access (CDMA) signal, is transmitted instead of a simple frequency chirp. The reflected spread-spectrum signal may be analyzed to gather range-resolved reflection data. Range-resolved reflection data may be gathered at each angular view. This data may be used to construct a more accurate approximation of the Fourier transform of the desired image than can be done by a conventional SAR approach. The image may be reconstructed from this Fourier transform using Fourier inversion techniques similar to those used in conventional SAR approaches. The range-resolved reflection scheme generally requires somewhat more processing to recover the image as compared with conventional SAR systems, but provides a significantly more stable image with less degradation from effects that plague conventional SAR systems. This can eliminate the need for phase coherency altogether and also eliminate “phase drift,” which leads to image distortion. This may be especially well suited for high resolution imaging of relatively large targets.

Inventors:
;
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1735164
Patent Number(s):
10746868
Application Number:
15/640,717
Assignee:
Triad National Security, LLC (Los Alamos, NM)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Patent
Resource Relation:
Patent File Date: 07/03/2017
Country of Publication:
United States
Language:
English

Citation Formats

Carlsten, Bruce E., and Judd, Stephen. Synthetic-aperture radar (SAR) imaging with range-resolved reflection data. United States: N. p., 2020. Web.
Carlsten, Bruce E., & Judd, Stephen. Synthetic-aperture radar (SAR) imaging with range-resolved reflection data. United States.
Carlsten, Bruce E., and Judd, Stephen. Tue . "Synthetic-aperture radar (SAR) imaging with range-resolved reflection data". United States. https://www.osti.gov/servlets/purl/1735164.
@article{osti_1735164,
title = {Synthetic-aperture radar (SAR) imaging with range-resolved reflection data},
author = {Carlsten, Bruce E. and Judd, Stephen},
abstractNote = {SAR imaging may be performed with range-resolved reflection data, where a spread-spectrum signal, such as a code division multiple access (CDMA) signal, is transmitted instead of a simple frequency chirp. The reflected spread-spectrum signal may be analyzed to gather range-resolved reflection data. Range-resolved reflection data may be gathered at each angular view. This data may be used to construct a more accurate approximation of the Fourier transform of the desired image than can be done by a conventional SAR approach. The image may be reconstructed from this Fourier transform using Fourier inversion techniques similar to those used in conventional SAR approaches. The range-resolved reflection scheme generally requires somewhat more processing to recover the image as compared with conventional SAR systems, but provides a significantly more stable image with less degradation from effects that plague conventional SAR systems. This can eliminate the need for phase coherency altogether and also eliminate “phase drift,” which leads to image distortion. This may be especially well suited for high resolution imaging of relatively large targets.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {8}
}

Works referenced in this record:

Pulse compression systems and methods
patent, March 2015


Ultra wideband ground penetrating radar imaging of heterogeneous solids
patent, November 1998


Waveform synthesis for imaging and ranging applications
patent, December 2004


Wideband digital spectrometer
patent, January 2011