SAR data focusing using seismic migration techniques

Cafforio, C.; Prati, C.; Rocca, F.

doi:10.1109/7.78293

Cited by 608 publications

(264 citation statements)

References 19 publications

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“…A precise method to achieve excellent accuracy in nearfield wide-band conditions is the so-called range migration algorithm (RMA), or ω-k [4,5]. The drawback of this technique is the introduction of an interpolation stage that implies a high computational cost and slows down the image generation.…”

Section: A Low Center-frequency-to-bandwidth Ratio or Quality Factormentioning

confidence: 99%

Extension of the chirp scaling algorithm to 3-D near-field wideband radar imaging

Gimeno¹,

López-Sánchez²,

Pascual³

2003

IEE Proc., Radar Sonar Navig.

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The objective of the present work is the development of an efficient algorithm to focus two-dimensional SAR images under the following extreme conditions: large coherent integration angles and high bandwidth-to-centrefrequency ratios (B/f c ). These conditions constitute a common situation in wide-band high-resolution SAR configurations.The algorithm presented in this paper is an extension of the well-known chirp scaling algorithm (CSA). First, the original 2-D CSA [1] is generalized by extending the formulation from data obtained with a linear aperture to data measured by a planar synthetic aperture. Moreover, a new compact generalized formula of the impulse response function in the three-dimensional frequency domain is presented. These extensions enable the development of a new 3-D algorithm in the aforementioned conditions. Finally, the algorithm has been implemented and satisfactory tested.

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Section: A Low Center-frequency-to-bandwidth Ratio or Quality Factormentioning

confidence: 99%

Extension of the chirp scaling algorithm to 3-D near-field wideband radar imaging

Gimeno¹,

López-Sánchez²,

Pascual³

2003

IEE Proc., Radar Sonar Navig.

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“…The Fω-k algorithm is currently used to operationally process spotlight CSK SAR data: it allows images that comply with processing time and quality requirements to be generated [Caltagirone et al, 2014]. As shown in Cafforio et al [1991], however, the ω-k algorithm provides an effective solution to the SAR inverse problem when the sensor trajectory is a straight line; satellite-borne sensors do not fit this scheme, and the application of migration techniques in such cases requires a careful analysis. The problem of focusing SAR data acquired along curved orbits has been studied in Cafforio et al [1991], Reighber et al [2006] and D'Aria and Monti-Guarnieri [2007].…”

Section: Introductionmentioning

confidence: 99%

“…Different frequency domain focusing algorithms have been proposed to obtain a good accuracy/ efficiency tradeoff. The most popular algorithms are the range-Doppler (RD) algorithm [Smith, 1991;Carrara et al, 1995;Schmidt, 2008], the chirp scaling (CS) algorithm [Papoulis, 1968;Raney, 1994;Carrara et al, 1995], and the "wavenumber domain" or "ω-k" algorithm [Rocca, 1987;Cafforio et al, 1991;Bamler, 1992;Carrara et al, 1995]. The ω-k algorithm, which was borrowed by geophysics [Rocca, 1987] and widely adopted by the SAR community [Bamler, 1992;Cumming and Wong, 2004;Reigber, 2006], provides the highest precision among the frequency-domain imaging algorithms, but it needs interpolation to implement Stolt mapping, which mainly determines the precision and efficiency of the algorithm.…”

Section: Introductionmentioning

confidence: 99%

Extension of Wavenumber Domain Focusing for spotlight COSMO-SkyMed SAR Data

Lorusso

Nicoletti

Gallipoli

et al. 2015

European Journal of Remote Sensing

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In this work we describe a method to handle curved orbits in wavenumber domain focusing algorithm for high-resolution SAR data acquired by Low Earth Orbit satellites using spotlight mode. The standard wavenumber domain focusing algorithm make assumptions that start to be invalid when applied to high-resolution spotlight SAR data acquired in spaceborne low Earth orbit (LEO) configurations. The assumption of a hyperbolic range history is no longer accurate for sub-metric spatial resolutions due to the satellite curved orbit. The proposed method is used to estimate the satellite velocity and closest-approach range distance of the rectified effective orbit which minimizes the phase errors over the whole scene coverage. This allows to use all frequency domain focusing kernels developed to focus SAR images acquired with a stripmap mode. We use this method with the ω-k algorithm, and its approximation Fast ω-k (Fω-k), demonstrating its effectiveness to focus COSMO-SkyMed (CSK) SAR images obtaining, respectively, sub-metric and metric azimuth spatial resolution.

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“…However, besides the requirement of the Chirp modulated signal, they usually fail to properly focuse the UWB/WB SAR data, even with much higher order terms of the Taylor expansion considered [15]. Therefore, the accurate frequency domain method, like ω-k algorithm [16][17][18] and its extended version [19], are still competitive alternatives to SAR imaging.…”

Section: Introductionmentioning

confidence: 99%

Azimuth Stacking Algorithm for Synthetic Aperture Radar Imaging

Li¹,

Tian²,

Wu³

et al. 2014

PIER

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Abstract-The aim of this paper is to present a frequency domain method for synthetic aperture radar (SAR) imaging. By using two consecutive linear mappings along Doppler and frequency domains, an azimuth-dependent SAR transfer function has been discovered. Based on this new transfer function, the SAR image can be reconstructed by the proposed azimuth stacking algorithm. The new algorithm can form SAR image at each azimuth position without DFT wrap around errors. If Chirp z-transform (CZT) is applied to carry out the two consecutive mappings (since they are linear mappings), the proposed algorithm will not require interpolations and thus its reconstructed image would be free of truncation errors. The new algorithm has been validated using both simulated and experimental ultrawideband/widebeam (UWB/WB) SAR data.

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SAR data focusing using seismic migration techniques

Cited by 608 publications

References 19 publications

Extension of the chirp scaling algorithm to 3-D near-field wideband radar imaging

Extension of the chirp scaling algorithm to 3-D near-field wideband radar imaging

Extension of Wavenumber Domain Focusing for spotlight COSMO-SkyMed SAR Data

Azimuth Stacking Algorithm for Synthetic Aperture Radar Imaging

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