Results 161 to 170 of about 641,941 (183)

Suppressing azimuth ambiguity in spaceborne SAR images based on compressed sensing

Science China Information Sciences, 2012
In spaceborne synthetic aperture radar, undersampling at the rate of the pulse repetition frequency causes azimuth ambiguity, which induces ghost into the images. This paper introduces compressed sensing for azimuth ambiguity suppression and presents two novel methods from the perspectives of system design and image formation, known as azimuth random ...
Ze Yu, Min Liu 0010
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On suppressing azimuth ambiguities of synthetic aperture radar by three filters

2001 CIE International Conference on Radar Proceedings (Cat No.01TH8559), 2002
This paper proposes a method for suppressing the azimuth ambiguities of synthetic aperture radar (SAR). This method is based on the discrete time domain model of the echo signal. In addition to the usual matched filter used by image reconstruction of SAR, other two filters are used to get responses which have the same shapes as the responses of the ...
null Zhimin Zhang, null Zhen-song Wang
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Suppression of Azimuth Ambiguities of Strong Point-Like Targets for Multichannel SAR Systems

IEEE Geoscience and Remote Sensing Letters, 2017
Multichannel synthetic aperture radar (SAR) signal reconstruction methods can effectively suppress azimuth ambiguities and achieve high-resolution wide-swath imaging. However, due to the characteristics of the practical antenna patterns, there exist non-bandlimited Doppler spectra, which will result in residual azimuth ambiguities, especially for ...
Xiaojiang Guo, Yesheng Gao, Kaizhi Wang, Xingzhao Liu   +3 more
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Suppression of azimuth ambiguities in spaceborne stripmap SAR using accurate restoration modeling

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015
Spaceborne Synthetic Aperture Radar (SAR) has attracted special interests in many applications, but suffers from image quality degradation caused by azimuth ambiguities. To suppress this phenomenon, different from conventional suppression method, this paper concentrates on the analysis of precise mathematic expression of azimuth ambiguities. Exploiting
Kai Wang, Jie Chen 0009, Wei Yang 0004, Zhuo Li 0005   +3 more
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On Azimuth Ambiguities Suppression for Short-Baseline Along-Track Interferometry: the Stereoid Case

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
Ambiguities in short-baseline ATI interferometry need to be treated not as noise that lowers the coherence, but as a source of bias. A mathematical formulation of the interferometric ambiguity model is given, and an approach to correct ambiguities is proposed and illustrated with simulation results.
Paco López-Dekker, Yuanhao Li 0001, Lorenzo Iannini, Pau Prats-Iraola, Marc Rodríguez-Cassola   +4 more
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Range ambiguity suppression by azimuth phase coding in multichannel SAR systems

IET International Radar Conference 2013, 2013
Among the techniques for range ambiguity suppression, the azimuth phase coding (APC) stands out for its effectiveness for point and distributed targets with low implementation complexity. After modulation to the transmitted signal and the corresponding demodulation to the received signal, the residual modulation phase of the ambiguity signal shifts its
null Jun Yang, null Mengdao Xing, null Yufeng Wu, null Guangcai Sun   +3 more
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Range-Ambiguous Clutter Suppression for the SAR-GMTI System Based on Extended Azimuth Phase Coding

IEEE Transactions on Geoscience and Remote Sensing, 2020
A range-ambiguous clutter suppression approach based on extended azimuth phase coding (EAPC) is proposed to handle the range ambiguity of the multiple-input multiple-output synthetic aperture radar (MIMO-SAR) system for ground moving target indication (GMTI) application.
Xiongpeng He, Guisheng Liao, Shengqi Zhu 0001, Jingwei Xu 0002, Chenghao Wang 0001   +4 more
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Adaptive suppression of azimuth ambiguities for multichannel SAR wide-swath imaging

IET International Radar Conference 2015, 2015
By exploiting the direction of arrival (DoA) information of azimuth ambiguity, an innovative algorithm for the adaptive suppression of azimuth ambiguity for multichannel SAR wide-swath imaging is presented. It firstly estimates the DoA value of each azimuth component within a Doppler cell using the efficient noise subspace-based iterative estimation ...
Mingwei Shen Mingwei Shen, Liu Yang Liu Yang, Di Wu Di Wu, Daiyin Zhu Daiyin Zhu   +3 more
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Reconstruct azimuth signal and suppress interbeam ambiguities of SPCMB SAR with hybrid filterbank

Journal of Electronics (China), 2008
Conventional Synthetic Aperture Radar (SAR) systems cannot obtain high-resolution and wide-swath illumination area due to the well-known minimum antenna area constraint. Single Phase Center MultiBeam (SPCMB) technique can overcome this limitation by adding spatial sampling through multiple receivers in azimuth direction.
Xiufeng Song, Weidong Yu
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Effect of Formation Design on Azimuth Ambiguity Suppression Capability in a Spaceborne Distributed SAR

IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium
Distributed Synthetic Aperture Radar (DSAR) systems represent an appealing solution to lower the overall costs and improve flexibility and efficiency of future Earth Observation missions. However, this type of systems requires receivers to fly very close to each other for enabling coherent beamforming techniques.
Antonio Gigantino, Claudio Vela, Roberto Opromolla, Giancarmine Fasano, Alfredo Renga, Maria Daniela Graziano   +5 more
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