On the Frequency Dispersion in DBF SAR and Digital Scalloped Beamforming

Zhao, Qingchao; Zhang, Yi; Wang, Wei; Liu, Kaiyu; Deng, Yunkai; Zhang, Heng; Wang, Yuying; Zhou, Yashi; Murphy, Robert W.

doi:10.1109/tgrs.2019.2958863

Cited by 25 publications

(11 citation statements)

References 29 publications

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“…For longer pulses (or sharper beams), already in [1], [2] it was suggested to realize a frequency-dispersive SCORE beam, in order to account for the dependence of the DoA on the pulse components. Different implementations are reported in the literature [1], [2], [15]- [17]. Nevertheless, their successful application in presence of topographic variations has not been addressed yet with sufficient care.…”

Section: Radiometric Degradation Associated With Terrain Height Varia...mentioning

confidence: 99%

“…Especially, fast topographic variations may be critical. More sophisticated solutions are based on the decomposition of the Rx signal into frequency subbands, and the application of specific DBF coefficients to each component [16], [17]. Anyway, in this case too, the compensation of the pulse extension in presence of fast topographic variations may be problematic, due to the constraints imposed by a realistic implementation complexity.…”

Section: Radiometric Degradation Associated With Terrain Height Varia...mentioning

confidence: 99%

“…is the expression in the frequency domain of the window Equation (17) provides a novel representation of the SCORE image formation process as a linear time-varying (LTV) filter, equivalent to that in Fig. 2 as regards input and output.…”

Section: Equivalent Linear Time-varying Filtermentioning

confidence: 99%

“…Finally, it is worth to remark that, for a distributed target, each single range line of the SCORE SAR image is not an exact scaled version of the corresponding ideal one. This is due to the time-varying nature of the image formation process, described by (17). In fact, d SL represents the ratio between the mean power of corresponding pixels, in the actual SCORE SAR image and the ideal one.…”

Section: Distributed Target Analysismentioning

confidence: 99%

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Radiometric Degradation Associated With Terrain Height Variations and Pulse Duration in Scan-On-Receive SAR Images

Bordoni

Krieger

Lind

2022

IEEE Trans. Geosci. Remote Sensing

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Scan-on-receive (SCORE) is a key digital beamforming (DBF) technique for future high-resolution wideswath spaceborne synthetic aperture radar (SAR) systems. Compared to a conventional approach, it allows to improve the signal-to-noise ratio and the range ambiguity suppression. Nevertheless, it also exposes the system to new errors, associated with terrain height variations and pulse duration. This work investigates the mutual effect of these error sources on the SCORE SAR image. A novel, closed, mathematical expression is derived, respectively, for the impulse response function of the image formation process and for the radiometric loss affecting the image pixels. This makes it possible to predict and quantify the effect of terrain height variations and pulse duration as a function of system, processing, and geometric parameters. The numerical results, based on the end-to-end simulation of the SAR image formation process in different operational scenarios, highlight the relevance of this effect and of the derived analytical description, especially in view of the demanding radiometric quality requirements imposed on future SAR images.

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Section: Radiometric Degradation Associated With Terrain Height Varia...mentioning

confidence: 99%

Section: Radiometric Degradation Associated With Terrain Height Varia...mentioning

confidence: 99%

Section: Equivalent Linear Time-varying Filtermentioning

confidence: 99%

Section: Distributed Target Analysismentioning

confidence: 99%

See 2 more Smart Citations

Radiometric Degradation Associated With Terrain Height Variations and Pulse Duration in Scan-On-Receive SAR Images

Bordoni

Krieger

Lind

2022

IEEE Trans. Geosci. Remote Sensing

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“…Synthetic aperture radar (SAR), which can provide remote sensing images during the day and night regardless of weather conditions, plays an important role in Earth and planetary observation [1][2][3]. In recent years, high resolution SAR imaging attracts growing interest due to its wide applications especially in military reconnaissance and disaster monitoring [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Modified Cartesian Factorized Backprojection Algorithm Integrating with Non-Start-Stop Model for High Resolution SAR Imaging

et al. 2020

Self Cite

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High resolution synthetic aperture radar (SAR) imaging has extensive application value especially in military reconnaissance and disaster monitoring. The motion of the satellite during the transmission and reception of the signal introduces notable errors in the high resolution SAR spotlight mode, which will lead to a defocused SAR image if not handled. To address this problem, an accurate correct echo model based on non-start-stop model is derived to describe the property of the SAR signal in the paper. Then, in the imaging processing, an azimuth-time-varying range frequency modulation rate is used for range compression. The range history and compensation phase are also derived based on the correct echo model. Then, combining the correct echo model and Cartesian factorized backprojection (CFBP) algorithm, a modified CFBP algorithm is proposed for SAR imaging to improve the accuracy and efficiency of processing. Besides, the influence of residual error due to mismatch is analyzed in detail. In the end, the simulation experiment and Gaofen-3 (GF-3) data experiment are carried out to demonstrate the feasibility of the proposed algorithm.

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Study of the relationship between sound signals and behaviors of a sperm whale during the hunting process

Jiang

Wang

et al. 2021

Applied Acoustics

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On the Frequency Dispersion in DBF SAR and Digital Scalloped Beamforming

Cited by 25 publications

References 29 publications

Radiometric Degradation Associated With Terrain Height Variations and Pulse Duration in Scan-On-Receive SAR Images

Radiometric Degradation Associated With Terrain Height Variations and Pulse Duration in Scan-On-Receive SAR Images

A Modified Cartesian Factorized Backprojection Algorithm Integrating with Non-Start-Stop Model for High Resolution SAR Imaging

Study of the relationship between sound signals and behaviors of a sperm whale during the hunting process

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