Results 141 to 150 of about 86,093 (168)

Suppression of Azimuth Ambiguities with Constellation of Micro-satellites

2006 CIE International Conference on Radar, 2006
To achieve wide-swath and full azimuth resolution in space-borne Synthetic Aperture Radar (SAR), a space-borne radar usually utilizes low Pulse Repetition Frequency (PRF) with a small aperture in azimuth. Consequently, the azimuth ambiguities are inevitable.
Wei Jing, Mengdao Xing, Zheng Bao
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Ambiguity Elimination of Vessel Target Azimuth for Shipborne HFSWR

IEEE Transactions on Aerospace and Electronic Systems
Weifeng Sun, Yiming Wang, Yonggang Ji
exaly   +3 more sources

Raw data based azimuth ambiguities removing

2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, 2007
With the constraint of the minimum antenna area in space-borne synthetic aperture radar (SAR), to obtain wide swath and high azimuth resolution, azimuth ambiguities are usually inevitable. With multiple channels data, beamforming can be utilized to remove the azimuth ambiguities.
null Wei jing, null Mengdao Xing, null Zheng Bao   +2 more
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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
exaly   +2 more sources

Spaceborne SAR azimuth ambiguities removal based on apodization algorithm

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
This paper proposes a new method to suppress azimuth ambiguities for synthetic aperture radar (SAR) images. This thought derives from sidelobes suppression in SAR images, by comparing the values of two or more versions of normalized SAR images, which are obtain after different weighting functions for the same image, we choose the minimum one as its ...
Min Liu 0010, Zhou Li 0002, Bo Liu 0016
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An Azimuth ambiguities removal method based on Polarimetric Notch Filter

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
In this paper, a new algorithm for detecting ship and removing azimuth ambiguities is presented. The proposed method is developed by combing the third eigenvalue and the Geometrical Perturbation-Polarimetric Notch Filter (GP-PNF) methods. We firstly improve the GP-PNF feature vector with the third eigenvalue calculated by the eigenvalues-eigenvector ...
Tao Zhang 0027, Armando Marino, Weilin Zhong, Huilin Xiong   +3 more
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Azimuth Ambiguity Detection and Suppression in SAR Images

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
We propose a novel SAR azimuth ambiguity suppression method. The proposed method is a post process for a SAR image; namely, it does not require any modification to the SAR image formation process nor the SAR system design. Noting that the azimuth ambiguity is blurred in the SAR image, the proposed algorithm refocuses the image to focus the azimuth ...
Noboru Oishi, Kei Suwa
exaly   +3 more sources

Azimuth ambiguity in redundant sampled stripmap SAS imaging

OCEANS 2016 - Shanghai, 2016
Spatial redundant sampling in stripmap SAS imaging is addressed in this paper, and the introduced aliasing is studied by theoretical and simulated results. An intuitive ambiguity suppression approach is proposed and validated. The provided relationship between redundant sampling and reconstructed image provides additional information for subsequent ...
Ziliang Qiao, Dieter Kraus
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A technique to eliminate the azimuth ambiguity in single-well imaging

Geophysics, 2014
ABSTRACT Single-well imaging has been a technique increasingly used in the detection of near-borehole geologic structures. The azimuth of a geologic structure, however, cannot be uniquely determined with acoustic signals recorded in the borehole alone, due to the azimuth ambiguity existing in current imaging techniques.
Yi-de Zhang, Hengshan Hu
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Azimuth Ambiguity Erasing in Spaceborne Bistatic SAR Images

2019 IEEE 4th International Conference on Signal and Image Processing (ICSIP), 2019
The first-order azimuth ambiguities in spaceborne bistatic synthetic aperture radar (SAR) images are especially strong due to small antenna length onboard micro-satellites. A method for “erasing” azimuth ambiguities is proposed which makes use of the difference between azimuth ambiguous signal and main signal caused by undersampling.
Feng He, Zhoudan Lv, Zaoyu Sun
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