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Impact of SAR Azimuth Ambiguities on Doppler Velocity Estimation Performance: Modeling and Analysis
Remote Sensing, 2023 Doppler Centroid Analysis (DCA) technique is one of the major techniques that do permit a direct retrieval of ocean surface velocity from synthetic aperture radar (SAR) data. However, azimuth ambiguities in the SAR images severely restrict the capability
Yawei Zhao, Kai Sun, Jinsong Chong
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Azimuth Ambiguities Removal in Littoral Zones Based on Multi-Temporal SAR Images
Remote Sensing, 2017 Synthetic aperture radar (SAR) is one of the most important techniques for ocean monitoring. Azimuth ambiguities are a real problem in SAR images today, which can cause performance degradation in SAR ocean applications.
Huanxin Zou, Xiangguang Leng
exaly +4 more sources
Remote Sensing, 2021 Azimuth ambiguities, or ghosts on SAR images, represent one of the main obstacles for SAR applications involving coastal monitoring activities such as ship detection.
Joon Hyuk Choi, Joong-Sun Won
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Remote Sensing, 2020 Hybrid quadrature polarimetric (hybrid quad-pol) synthetic aperture radar (SAR) is proposed as a potential candidate for the full-polarimetric SAR mode. It allows balanced range ambiguity performance and simplified system structure.
Pengfei Zhao +4 more
doaj +2 more sources
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021 The azimuth multichannel synthetic aperture radar (SAR) technology is capable of overcoming the minimum antenna area constraint and achieving high-resolution and wideswath (HRWS) imaging.
Mingqian Liu +5 more
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Remote Sensing, 2021 Hybrid and ±π/4 quadrature-polarimetric (quad-pol) synthetic aperture radar (SAR) systems operating from space can obtain all polarimetric components simultaneously but suffer from severe azimuth ambiguities in the cross-polarized (cross-pol) measurement
Pengfei Zhao +4 more
doaj +1 more source
Azimuth Unambiguity Suppression for Low-oversampled Staggered SAR Images
Leida xuebao, 2021 Low-oversampled staggered synthetic aperture radar can achieve continuously observed high-resolution and wide-swath imaging by utilizing the variable pulse repetition interval to distribute blind ranges.
Xingxing LIAO, Zhe LIU, Junjie WU
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Remote Sensing, 2022 The speed and direction of a missile shifts sharply in the dive phase, making the azimuth frequency modulation (FM) rate change with the azimuthal position, leading to azimuth ambiguities and image distortion.
Zirui Xi +6 more
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Fast Approach for SAR Imaging of Ground-Based Moving Targets Based on Range Azimuth Joint Processing
Remote Sensing, 2022 The synthetic aperture radar (SAR) images of a moving target may be out of focus, given the motions of a non-cooperative target. Doppler ambiguities, including the Doppler center blur and spectrum ambiguity, will easily appear due to the limitations of ...
Yuxiang Shu +4 more
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On the characteristics of ASCAT wind direction ambiguities [PDF]
Atmospheric Measurement Techniques, 2013 The inversion of the Advanced Scatterometer (ASCAT) backscatter measurement triplets generally leads to two wind ambiguities with similar wind speed values and opposite wind directions.
W. Lin +3 more
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