A Pod-Based Dual-Beam SAR

Farquharson, Gordon; Junek, W. N.; Ramanathan, Anand; Frasier, Stephen J.; Tessier, Russell; McLaughlin, D.J.; Sletten, Mark A.; Toporkov, Jakov V.

doi:10.1109/lgrs.2004.826553

Cited by 26 publications

(12 citation statements)

References 9 publications

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“…The description of the An experiment was conducted near the Gulf Stream (GS) boundsystem, called a dual-beam interferometer (DBI), has been ary. A sharp change of the surface velocity of about I m/s over a given in [ 12] and [ 13], the latter paper also reported an applica-500 m distance was measured. The wave condition is dominated tion of the DBI to map out the velocity field around two tidal by a 14-s swell system and low wind velocity.…”

Section: Distribution/availability Statementmentioning

confidence: 61%

“…Combining two flight passes, the assumption of v,=0 for the DBI system configurations used in the present experiment have above solution can be discarded, and all three orthogonal cornbeen reported elsewhere [12][13]. Briefly, the DBI operates at ponents of the surface velocity can be derived from the radial C-band (5.3 GHz) and vertical polarization.…”

Section: Distribution Statement a Approved For Public Release Distribmentioning

confidence: 99%

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Wave Measurements using a Dual-beam Interferometer Near Gulf Stream Boundary

Hwang¹,

Toporkov²,

Sletten³

et al. 2006

2006 IEEE International Symposium on Geoscience and Remote Sensing

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Section: Distribution/availability Statementmentioning

confidence: 61%

Section: Distribution Statement a Approved For Public Release Distribmentioning

confidence: 99%

Wave Measurements using a Dual-beam Interferometer Near Gulf Stream Boundary

Hwang¹,

Toporkov²,

Sletten³

et al. 2006

2006 IEEE International Symposium on Geoscience and Remote Sensing

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“…Before combining the interferograms to compute the estimated along-and cross-track velocities, each pixel in the fore and aft interferograms should be shifted back by ± ri D , according to (3). After this remapping process, the new interferograms can be interpolated and resampled on a regular grid, and the corrected velocities estimated.…”

Section: Report Documentation Pagementioning

confidence: 99%

“…Frasier and Camps [2] developed this concept in more detail and presented an analysis of a proposed system, the Dual Beam Interferometer (DBI), which has since been constructed and recently demonstrated in the field [3,4]. However, in the presence of significant current gradients, an effect akin to velocity-bunching can cause distortion in the measured current estimates.…”

Section: Introductionmentioning

confidence: 99%

An analysis of gradient-induced distortion in dual beam ati systems for vector surface current mapping

Sletten

Proceedings. 2005 IEEE International Geoscience and Remote Sensing Symposium, 2005. IGARSS '05.

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Abstract-This paper summarizes an analysis of gradientinduced distortions in the vector surface current estimates generated by dual-beam, along-track interferometric SAR systems. In such systems, interferograms from two squinted beams, one squinted forward of broadside and the other aft, are combined to measure the full surface current vector with only a single aircraft pass. However, in the presence of significant current gradients, an effect akin to velocity-bunching can cause distortion in the measured current estimates. Up to a point, these distortions can be removed by a straightforward, spatial remapping of the interferogram pixels based upon their phase values. However, there is a critical current gradient beyond which the true surface current field is not recoverable. In addition, the along-track component of the surface current introduces unequal azimuthal displacements in the fore-and aftsquinted interferograms. As a result, when along-track currents are present, the two interferograms will not be spatially registered. If appreciable along-track current gradients are also present, the resulting current vector estimates in and around the gradient region will undergo further distortion. These effects are explored through an approximate, linear analysis as well as through a full interferometric SAR model, using the current gradients present in rivers as an example.

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“…Simultaneous availability of fore and aft-looking ATI-SAR data allows estimation of vector surface velocity during a single aircraft pass over the area of interest [1].…”

Section: Introductionmentioning

confidence: 99%

Gulf stream observations obtained with the Umass dual beam interferometer and an infrared camera

Perkovic

Toporkov²,

Sletten³

et al.

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings

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The Dual Beam Interferometer (DBI) developed by University of Massachusetts (UMass) and an infrared camera operated by the Naval Research Laboratory (NRL) were jointly deployed during a March 2004 flight campaign off the east coast of Florida. Data collected produced simultaneous observations of features over the Gulf Stream's western boundary by both instruments. Use of instruments with different imaging capabilities enabled extraction of wind direction as well as current velocity measurement.

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A Pod-Based Dual-Beam SAR

Cited by 26 publications

References 9 publications

Wave Measurements using a Dual-beam Interferometer Near Gulf Stream Boundary

Wave Measurements using a Dual-beam Interferometer Near Gulf Stream Boundary

An analysis of gradient-induced distortion in dual beam ati systems for vector surface current mapping

Gulf stream observations obtained with the Umass dual beam interferometer and an infrared camera

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