Results 11 to 20 of about 200,445 (197)

Azimuth Phase Coding by Up and Down Chirp Modulation for Range Ambiguity Suppression

IEEE Access, 2019
High range ambiguity level will impair the spaceborne SAR image quality and hamper following SAR image applications. The range ambiguity suppression effect of the up and down chirp modulation on spaceborne SAR images is analyzed in this paper.
Weixian Tan, Wei Xu, Pingping Huang
exaly   +3 more sources

SAAS-Net: Self-Supervised Sparse Synthetic Aperture Radar Imaging Network with Azimuth Ambiguity Suppression

Remote Sensing
Sparse Synthetic Aperture Radar (SAR) imaging has garnered significant attention due to its ability to suppress azimuth ambiguity in under-sampled conditions, making it particularly useful for high-resolution wide-swath (HRWS) SAR systems.
Zhiyi Jin, Zhouhao Pan, Zhe Zhang, Xiaolan Qiu   +3 more
doaj   +2 more sources

A Novel PRI Variation Strategy for Range Ambiguity Suppression in Quad-Pol Staggered Spaceborne SAR Based on Azimuth Phase Coding

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Staggered synthetic aperture radar (SAR) is compatible with quadrature-polarimetric (quad-pol) SAR, enabling ultrawide continuous swath quad-pol SAR imaging with fine azimuth resolution.
Ruizhen Song, Wei Wang, Yongwei Zhang, Yuwei Wu, Weidong Yu   +4 more
doaj   +2 more sources

A sparse moving array imaging approach for FMCW radar with dual-aperture adaptive azimuth ambiguity suppression and adaptive QR decomposition

Defence Technology
Range-azimuth imaging of ground targets via frequency-modulated continuous wave (FMCW) radar is crucial for effective target detection. However, when the pitch of the moving array constructed during motion exceeds the physical array aperture, azimuth ...
Jian Dai, Yanwen Han
exaly   +3 more sources

A Novel Weighted Amplitude Modulation (WAM) System for Ambiguity Suppression of Spaceborne Hybrid Quad-Pol SAR

Remote Sensing, 2021
Quadrature-polarimetric synthetic aperture radar (quad-pol SAR) has extensive applications, including climate zones classification, extraction of surface roughness, soil moisture mapping, moving target indication, and rice mapping.
Yanyan Zhang, Sheng Chang, Robert Wang, Peng Li, Yongwei Zhang, Yunkai Deng   +5 more
doaj   +1 more source

Azimuth Spectrum Reconstruction Algorithm Based on Updating Factors Regionally for Onboard Real-Time Multichannel SAR Imaging

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
Multichannel spaceborne synthetic aperture radar (SAR) is a useful approach to overcome minimum antenna area constraint and achieve high-resolution and wide-swath imaging.
Pengnan Zheng, Zegang Ding, Linghao Li, Han Li, Zhe Li   +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
doaj   +1 more source

Ambiguity Suppression by Azimuth Phase Coding in Multichannel SAR Systems [PDF]

, 2011
The Azimuth Phase Coding (APC) technique, proposed to suppress range ambiguities in conventional SAR systems, stands out for its low implementation complexity and its effectiveness for point and distributed ambiguities.
Bordoni, Federica, Federica Bordoni, Younis, Marwan, Krieger, Gerhard, Marwan Younis, Gerhard Krieger   +5 more
core   +1 more source

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, Jun Wan, Dong Li, Zhanye Chen, Hongqing Liu   +4 more
doaj   +1 more source

BarnebyLives: An R package to create herbarium specimen labels and clean spreadsheets. [PDF]

Appl Plant Sci
Abstract Premise Accessioning herbarium specimens is labor intensive, yet remains vital for research in ecology, evolution, and conservation. As institutional support for herbaria declines, efficient tools are needed to streamline this process. The R package BarnebyLives was developed to assist collectors by supplementing collection notes, verifying ...
Benkendorf RC, Fant JB.
europepmc   +2 more sources