Inverse scattering analysis of diffraction limited SAR

Hellsten, Hans

doi:10.1109/8.59762

Cited by 17 publications

(3 citation statements)

References 9 publications

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“…As one option, the wave field inversion task can be formulated in the time-space domain. Such algorithms, sometimes applied in SAR, are predominantly within the class of spherical back-propagation algorithms [31], [32]. Corresponding SAR inversion methods can be developed in frequency-space and frequency-wavenumber domains.…”

Section: Spherical Wave Theorymentioning

confidence: 99%

Aperture Synthesis With Digital Array Radars and Covariant Change of Wavenumber Variables

Barnes

2023

IEEE J. Sel. Top. Signal Process.

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Attributes of digital array radars are leveraged in enhancements of wideband frequency-wavenumber (omega-k) methods to achieve 1) single-pulse, short-range imaging from a stationary array; 2) single-pulse, all-range, high-density, digital beamforming-on-receive from a stationary array; 3) multiple-pulse aperture synthesis for shortrange imaging with sensor movement; and 4) multiple-pulse inverse aperture synthesis for long-range imaging with tracked object movement. Modifications to conventional omega-k algorithms used in synthetic aperture radar are introduced to accommodate antenna element level data, real array element spacing, large scene size and small array size (compared to scene size). Large scene size with k-space processing is handled by a novel Huygens-Fresnel transfer function that does not fully rely on zero-padding to resolve array and scene size mismatch. Aperture synthesis with generalized pulse-to-pulse sensor-step operations is supported. Connections between omega-k wavenumber migration and a covariant change of variables transform associated with Dirac's spectral models of free and scattered electromagnetic fields are established.

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Section: Spherical Wave Theorymentioning

confidence: 99%

Aperture Synthesis With Digital Array Radars and Covariant Change of Wavenumber Variables

Barnes

2023

IEEE J. Sel. Top. Signal Process.

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“…Since g is defined on a rectangular grid we might use linear interpolation for the variable r in the sum of formula (3) . We choose instead the following procedure.…”

Section: Fast Backprojectionmentioning

confidence: 99%

<title>Application of fast back-projection techniques for some inverse problems of synthetic aperture radar</title>

Nilsson

Andersson

1998

SPIE Proceedings

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“…The SAR processing algorithm assumes a semi-circular illumination pattern that is realized by the two antenna tubes that are trailed behind the aircraft. A more extensive summary of the system and the SAR processing algorithm can be found in [6], [7]. The frequency band corresponds to wavelengths between 3.3 and 15 m, which gives the system a good ability to penetrate the forest canopy and image the bulk characteristics of the vegetation.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of forest stem volume using VHF SAR

Israelsson

Ulander

Askne

et al. 1997

IEEE Trans. Geosci. Remote Sensing

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Abstract-The ability to retrieve forest stem volume using CARABAS (coherent all radio band sensing) SAR images (28-60 MHz) has been investigated. The test site is a deciduous mixed forest on the island ofÖland in southern Sweden. The images have been radiometrically calibrated using an array of horizontal dipoles. The images exhibit a clear discrimination between the forest and open fields. The results show that the dynamic range of the backscattering coefficient among the forest stands is higher than what has been found with conventional SAR using microwave frequencies. The backscatter increases with increasing radar frequency. This work shows an advantage compared to higher frequencies for stem volume estimation in dense forests.

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Inverse scattering analysis of diffraction limited SAR

Cited by 17 publications

References 9 publications

Aperture Synthesis With Digital Array Radars and Covariant Change of Wavenumber Variables

Aperture Synthesis With Digital Array Radars and Covariant Change of Wavenumber Variables

<title>Application of fast back-projection techniques for some inverse problems of synthetic aperture radar</title>

Retrieval of forest stem volume using VHF SAR

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