Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR

Wen, Xuejiao; Qiu, Xiaolan

doi:10.3390/s20082201

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…In [14]- [17], the uncooperative motions were analyzed, and approaches for SAR GMTI processing and refocusing were proposed. Furthermore, the influence of the rotating target on SAR imaging and the corresponding refocusing algorithms were further explored in [18]- [21]. Moreover, many studies have focused on parameter estimation for vibration.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution SAR Imaging Characteristics for Multiple Scattering of Rotating Targets

Wang,

Qiu,

Wen

2024

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

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The rotation of targets in high-resolution synthetic aperture radar (SAR) images results in complex and nonlinear micro-Doppler modulation of SAR returns, exhibiting distinct and diverse imaging characteristics under different conditions. This poses challenges to image interpretation, target detection and recognition. This study establishes signal models for single and multiple scattering of rotating targets in high-resolution spaceborne SAR and, in conjunction with the processing procedures of range doppler algorithm (RDA), derives the azimuth bandwidth and the conditions for azimuth frequency aliasing caused by rotation. Quantitative analysis of the errors introduced by target rotation in various signal domains is performed, takeing into account the stationary phase point offset, the rotationinduced range migration correction error (RMCE), and the change of azimuth phase in detail. Additionally, representative signatures of these influences in SAR images are simulated and interpreted and more accurate theoretical models of imaging results are derived. The processing and analysis of both simulation and real measured data validate the correctness of the theoretical derivation in this study and provide support for the interpretation and information extraction of high-resolution SAR rotating targets.

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Section: Introductionmentioning

confidence: 99%

High-Resolution SAR Imaging Characteristics for Multiple Scattering of Rotating Targets

Wang,

Qiu,

Wen

2024

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

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“…Besides the above-mentioned experimental systems, there is no operational civilian satellite supporting the ATI technique. To provide the ATI technique for future satellites and verify its effectiveness, for the first time, the current measurement experiments based on ATI are conducted on China's Gaofen-3 satellite (GF-3) [25] from 2018 to 2019. The details of the experiments are introduced in the paper.…”

Section: Introductionmentioning

confidence: 99%

Observing Sea Surface Current by Gaofen-3 Satellite Along-Track Interferometric SAR Experimental Mode

Yuan

Lin

Han

et al. 2021

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

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Sea surface current is a research hotspot in oceanography. Space-borne along-track interferometric Synthetic Aperture Radar (along-track InSAR, ATI) is a promising sensor for measuring high-resolution sea surface current field, and there is no operational system in orbit yet. To support future spaceborne ATI systems, based on the ATI experimental mode of the Gaofen-3 (GF-3) satellite, the first sea surface current observing experiment was conducted in the Jiaozhou Gulf in China in 2019. Meanwhile, SAR observations and in-situ instrument measurements of the current are obtained in the experiments. The data is firstly preprocessed by a processor specially developed for the GF-3 ATI data. Then, the current is extracted based on the M4S mode. The retrieved current of the Jiaozhou Gulf is compared with ground-based High Frequency Surface Wave Radar (HFSWR) data. The results show that the root mean square error (RMSE) of the surface current observed by the GF-3 satellite is less than 0.2 m/s.

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“…Ground moving target indication (GMTI) and track formation have received growing attention in both civilian and military applications [1][2][3], with the development of synthetic aperture radar (SAR) technique. However, moving targets are defocused and dislocated in SAR image due to unknown motion parameters [4], especially in the case of long dwell time.…”

Section: Introductionmentioning

confidence: 99%

A Moving Target Velocity Estimation Method Based on the MC-MASA SAR Mode

et al. 2021

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Imaging position shift based on the multiple azimuth squint angles (MASA) mode is effective for target azimuth velocity estimation, whereas accuracy is low when target range velocity is high. In this paper, the estimation problem for both target azimuth and range velocities is considered based on the multi-channels MASA (MC-MASA) mode. Firstly, the acquisition geometry of MC-MASA mode and Doppler characteristics of a moving target are analyzed in detail, especially in squint mode. Then, for better moving target estimation, the stationary background clutter is removed using the displacement phase center antenna (DPCA) technique, and the failure in range velocity estimation with sequential SAR images is also discussed. Furthermore, a modified along-track interferometry (ATI) is proposed to preliminarily reconstruct the azimuth-and-range velocity map based on the MC-MASA mode. Since the velocity estimation accuracy is dependent on squint angle and signal-to-clutter ratio (SCR), the circumstances are divided into three cases with different iteration estimation strategies, which could expand the scene application scope of velocity estimation and achieve a high estimation accuracy along both azimuth and range directions. Finally, the performance of the proposed method is demonstrated by experimental results.

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Research on Turning Motion Targets and Velocity Estimation in High Resolution Spaceborne SAR

Cited by 9 publications

References 29 publications

High-Resolution SAR Imaging Characteristics for Multiple Scattering of Rotating Targets

High-Resolution SAR Imaging Characteristics for Multiple Scattering of Rotating Targets

Observing Sea Surface Current by Gaofen-3 Satellite Along-Track Interferometric SAR Experimental Mode

A Moving Target Velocity Estimation Method Based on the MC-MASA SAR Mode

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