Refocusing FMCW SAR Moving Target Data in the Wavenumber Domain

Casalini, Emiliano; Frioud, Max; Small, David; Henke, Daniel

doi:10.1109/tgrs.2018.2884830

Cited by 10 publications

(9 citation statements)

References 18 publications

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“…Table II summarizes the nominal values of the main system parameters and, additionally, it provides mean and standard deviation of the platform motion parameters. For a more detailed description of the experiment, please refer to [11].…”

Section: Methods a Sensor And Experimental Set-upmentioning

confidence: 99%

“…As a consequence, moving targets signals are not coherently integrated, thereby producing signatures which are both blurred and displaced along-track [6]. Many publications have dealt with the imaging of moving targets in SAR images [7]- [11]. In [7], the authors derive the moving This work was supported in part by armasuisse W+T.…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, well-known SAR processors can be adjusted for radar imaging purposes: a bank of focusing filters based on the chirp scaling algorithm can efficiently image moving targets [9]. Furthermore, the concept of normalized relative speed (NRS) has been used to modify the wavenumber domain algorithm (WDA) for both pulsed [10] and FMCW SAR [11]. Though yielding fairly good results, the aforementioned algorithms are based upon simplified range history models, which are unlikely to hold, for instance, in maritime scenarios where targets undergo complicated angular motions (e.g., roll, pitch and yaw).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Moving Target Refocusing With the FMCW SAR System MIRANDA-35

Casalini

Fagir

Henke

2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Section: Methods a Sensor And Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Moving Target Refocusing With the FMCW SAR System MIRANDA-35

Casalini

Fagir

Henke

2021

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…Frequency modulated continuous wave (FMCW SAR) is especially suitable for small-scale platforms such as precision guided weapons and UAVs [1][2] . The traditional "stop-go-stop" assumption of SAR is no longer applicable, and the stationary target SAR imaging method is difficult to accurately focus on the moving target.…”

Section: Introductionmentioning

confidence: 99%

High resolution moving targets imaging algorithm of FMCW SAR

He,

Tan,

et al. 2024

Fourth International Conference on Sensors and Information Technology (ICSI 2024)

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In this paper, the problem of parameter estimation and imaging of ground accelerated moving targets with frequency modulated continuous wave synthetic aperture radar (FMCW SAR) is studied. First, a fourth-order moving target echo model is established in FMCW SAR system, and the coefficient estimation of the azimuth signal based on adaptive local polynomial Fourier transform (ALPFT) is proposed. Secondly, the range migration term is corrected by generalized Keystone transform and Hough transform. Finally, by compensating the high-order Doppler phase and azimuth resampling the edge moving targets, all moving targets in the scene can be focused well. Simulation results verify the feasibility and effectiveness of the proposed method.

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“…In addition to the self-powered translation, ships also nonuniformly rotate by the influence of sea waves and other factors, which leads to the defocusing of ship images. Many SAR imaging methods [1][2][3][4][5][6] were proposed for moving target refocusing. However, these methods are inapplicable for rotating targets.…”

Section: Introductionmentioning

confidence: 99%

Nonuniformly-Rotating Ship Refocusing in SAR Imagery Based on the Bilinear Extended Fractional Fourier Transform

Fan

Zhang

2020

Sensors

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Nonuniformly-rotating ship refocusing is very significant in the marine surveillance of satellite synthetic aperture radar (SAR). The majority of ship imaging algorithms is based on the inverse SAR (ISAR) technique. On the basis of the ISAR technique, several parameter estimation algorithms were proposed for nonuniformly rotating ships. But these algorithms still have problems on cross-terms and noise suppression. In this paper, a refocusing algorithm for nonuniformly rotating ships based on the bilinear extended fractional Fourier transform (BEFRFT) is proposed. The ship signal in a range bin can be modeled as a multicomponent cubic phase signal (CPS) after motion compensation. BEFRFT is a bilinear extension of fractional Fourier transform (FRFT), which can estimate the chirp rates and quadratic chirp rates of CPSs. Furthermore, BEFRFT has excellent performances on cross-terms and noise suppression. The results of simulated data and Gaofen-3 data verify the effectiveness of BEFRFT.

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Refocusing FMCW SAR Moving Target Data in the Wavenumber Domain

Cited by 10 publications

References 18 publications

Moving Target Refocusing With the FMCW SAR System MIRANDA-35

Moving Target Refocusing With the FMCW SAR System MIRANDA-35

High resolution moving targets imaging algorithm of FMCW SAR

Nonuniformly-Rotating Ship Refocusing in SAR Imagery Based on the Bilinear Extended Fractional Fourier Transform

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