Interferometric multi-look techniques for SAR data

Scheiber, Rolf; Bothale, Vinod M

doi:10.1109/igarss.2002.1024978

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…An algorithm based on multiple look processing was first presented in [5] to accommodate aperture-dependent motion errors, while in [6] a very similar algorithm (i.e., FD) was suggested, which also makes a comment on topography accommodation. It takes a similar approach as the SATA algorithm but makes the blocks (looks) in the frequency domain instead of in the time domain.…”

Section: Frequency Division (Fd) Algorithmmentioning

confidence: 99%

Comparison of Topography- and Aperture-Dependent Motion Compensation Algorithms for Airborne SAR

Prats

Macedo

Reigber³

et al. 2007

IEEE Geosci. Remote Sensing Lett.

125

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Abstract-This letter presents a comparison between threeFourier-based motion compensation (MoCo) algorithms for airborne synthetic aperture radar (SAR) systems. These algorithms circumvent the limitations of conventional MoCo, namely the assumption of a reference height and the beam-center approximation. All these approaches rely on the inherent time-frequency relation in SAR systems but exploit it differently, with the consequent differences in accuracy and computational burden. After a brief overview of the three approaches, the performance of each algorithm is analyzed with respect to azimuthal topography accommodation, angle accommodation, and maximum frequency of track deviations with which the algorithm can cope. Also, an analysis on the computational complexity is presented. Quantitative results are shown using real data acquired by the Experimental SAR system of the German Aerospace Center (DLR).

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Section: Frequency Division (Fd) Algorithmmentioning

confidence: 99%

Comparison of Topography- and Aperture-Dependent Motion Compensation Algorithms for Airborne SAR

Prats

Macedo

Reigber³

et al. 2007

IEEE Geosci. Remote Sensing Lett.

125

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“…Since each target has different phase error, it is a big computation burden when calculating phase error in a whole synthetic aperture and compensating it for all targets. Multi-look approach [6] deals with this problem and implements residual error correction in time domain.…”

Section: Limitations Of Td-mocomentioning

confidence: 99%

“…Compared with the interformetric multi-look techniques [6] , the proposed FD-MOCO has some differences and advantages although both of them have similar principle.…”

Section: Advantages Of Fd-mocomentioning

confidence: 99%

“…(6) Number of blocks In multi-look techniques, the Effective Number of Looks (ENL) is defined by the mean and standard deviation of the look-summed data [6] . That is for lower speckle noise, but not for motion compensation.…”

Section: Advantages Of Fd-mocomentioning

confidence: 99%

“…The azimuth spectrum is divided into several blocks and each block is processed with angle-variant motion compensation as suggested in Ref. [6]. Multi-look processing with coherent addition provides the basis of the algorithm.…”

Section: Introductionmentioning

confidence: 99%

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Motion compensation for wide beam SAR based on frequency division

Zheng

2008

J. Electron.(China)

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Aperture-dependent motion compensation is important for wide beam Synthetic Aperture Radar (SAR) data processing. This paper studies a wide beam motion compensation algorithm based on frequency division. It takes blocks along azimuth dimension in frequency domain and applies angle-variant motion compensation in time domain. With this frequency division based motion compensation approach, the effects of aperture-dependent residual phase errors are corrected precisely. The rationale and procedure of this algorithm are introduced in detail. Point targets and images of a P-band airborne SAR with motion errors are simulated to validate this algorithm. Compared with the wide beam motion compensation algorithms based on time division, the proposed algorithm has better performance, especially in terms of high-frequency motion errors.

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