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Raw data based azimuth ambiguities removing
2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, 2007With 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 +2 more
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Spaceborne SAR azimuth ambiguities removal based on apodization algorithm
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016This 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), 2017In 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 +3 more
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Suppressing the azimuth ambiguities in synthetic aperture radar images
IEEE Transactions on Geoscience and Remote Sensing, 1993A method for removing the azimuth ambiguities from synthetic aperture radar (SAR) images is proposed. The basic idea is to generate a two-dimensional reference function for SAR processing which provides, in addition to the matched filtering for the unaliased part of the received signal, the deconvolution of the azimuth ambiguities.
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Azimuth ambiguity in redundant sampled stripmap SAS imaging
OCEANS 2016 - Shanghai, 2016Spatial 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, 2014ABSTRACT 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), 2019The 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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Suppression of Additional Azimuth Ambiguities Under Multi-Channel and Multi-Waveform SAR
IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020Future spaceborne SAR satellites are going to handle multiple receivers to take both high resolution and wide observation swath. In addition, they will transmit multiple chirp patterns to reduce the effect of the range ambiguity. Such a multi-channel and multi-waveform system raises additional azimuth ambiguities caused by the phase distortion of the ...
Natsuaky, Ryo, Prats-Iraola, Pau
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Azimuth Ambiguity Suppression for Multichannel Geosynchronous Spaceborne-Airborne Bistatic SAR
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018Due to the high altitude illuminator and the separation of the receivers and transmitter, Geosynchronous (GEO) spaceborne-airborne bistatic SAR (GEO BiSAR) is more flexible and accessible in remote sensing applications. However, by introducing a high speed airborne platform as receiver, azimuth spectrum aliasing occurs. In order to suppress the azimuth
Hongyang An +5 more
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Azimuth ambiguity suppression based on minimum mean square error estimation
2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015An innovative algorithm to suppress the strong azimuth ambiguity in single-look complex (SLC) synthetic aperture radar (SAR) images is presented. The basic idea is to construct a subspace with low ambiguous power and project the original image to the aforementioned subspace to suppress the azimuth ambiguity by the minimum mean square error estimation ...
Youming Wu +3 more
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