Improved slope estimation for SAR Doppler ambiguity resolution

Cumming, I.; Li, Shu

doi:10.1109/tgrs.2005.861925

Cited by 47 publications

(20 citation statements)

References 9 publications

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“…We estimate the unknown parameter σ of (45) using MATLAB's fminsearch routine, which uses the NelderMead parameter search procedure [27,28]. As V min,a V p , we have α min ≈ 2V min,a /V p .…”

Section: Discussionmentioning

confidence: 99%

Ground moving target indication and parameters estimation using a dual-frequency synthetic aperture radar

Wang

Liu

et al. 2012

EURASIP J. Adv. Signal Process.

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A new scheme is presented to estimate the range and azimuth velocity components of a detected moving target by using a dual-frequency synthetic aperture radar (SAR). It consists of a moving target detector, a range velocity estimator, and an azimuth velocity estimator. In this scheme, two original SAR images are achieved from the returns first, and then processed by a symmetric defocusing filter pair (SDFP) to produce two defocused images. By comparing the sharpness of the two defocused images, the moving targets are indicated and isolated form each original SAR image. For a selected moving target, its range velocity component is estimated by using a Doppler ambiguity solver and a stepped approximation-and-comparison algorithm. After range velocity compensated, the target in the patch is concentrated in less range bins, and its azimuth velocity component is estimated by using an SDFP bank. Finally, the moving target is refocused and its azimuth displacement caused by range velocity component is corrected. The effectiveness of the proposed scheme is confirmed by the experiments with the field and simulated data.

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Section: Discussionmentioning

confidence: 99%

Ground moving target indication and parameters estimation using a dual-frequency synthetic aperture radar

Wang

Liu

et al. 2012

EURASIP J. Adv. Signal Process.

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“…Because the beat spectrum has a sharper peak and less noise after RCMC, the choice of frequency estimator is not so critical, and the simple FFT estimator works well in strip-map operations. 12 It is interesting that using RCMC also gave substantial improvement to the "slope estimation" class of Doppler ambiguity estimators [14]. Fig.…”

Section: B Experiments Over a Full Sar Scenementioning

confidence: 98%

Adding Sensitivity to the MLBF Doppler Centroid Estimator

Cumming

2007

IEEE Trans. Geosci. Remote Sensing

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“…The Radon transform has been successfully used in SAR image processing for its advantageous property in detecting lines with arbitrary orientation [30]. We adopt the Radon transform to get the slope of the Doppler locus of a moving target in the range Doppler plane.…”

Section: Principlementioning

confidence: 99%

Moving-Target Velocity Estimation in a Complex-Valued Sar Imagery

Li¹,

Lv²,

Liu³

2013

PIER

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Abstract-In the ground moving target indication with synthetic aperture radar (SAR) community, algorithms used to estimate the velocity of a detected moving target are important because they are relative to the topics about refocusing and azimuth displacement correction. The velocity is regarded as a vector with two components, one in azimuth and one in range direction, and new algorithms aiming at estimating the two components are proposed and verified. The range velocity estimator transforms a detected patch containing a moving target to range Doppler domain by using the 1-D fast Fourier Transform in each range bin to achieve its range Doppler locus. The slope of the range Doppler locus is computed by using the Radon Transform on the range Doppler plane and the range velocity component is worked out according to radar system parameters and the slope value. Two estimators are proposed to compute the azimuth velocity component. One is based on symmetric defocusing in Doppler domain, the other is based on phase gradient in wave-number domain. Experiments confirm the effectiveness of the estimators by using simulated and field data.

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Improved slope estimation for SAR Doppler ambiguity resolution

Cited by 47 publications

References 9 publications

Ground moving target indication and parameters estimation using a dual-frequency synthetic aperture radar

Ground moving target indication and parameters estimation using a dual-frequency synthetic aperture radar

Adding Sensitivity to the MLBF Doppler Centroid Estimator

Moving-Target Velocity Estimation in a Complex-Valued Sar Imagery

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