Results 21 to 30 of about 326 (121)

Forward-looking Multi-channel Synthetic Aperture Radar Imaging and Array Attitude Error Compensation

Leida xuebao, 2023
To solve the problem of left-right Doppler ambiguity in forward-looking Synthetic Aperture Radar (SAR) imaging, Forward-Looking Multi-Channel SAR (FLMC-SAR) can achieve Doppler ambiguity resolving imaging through beamforming.
Xinshuo WANG, Jingyue LU, Zhichao MENG, Lei ZHANG   +3 more
doaj   +1 more source

Azimuth Ambiguity Suppression in SAR Images Based on Compressive Sensing Recovery Algorithm

Leida xuebao, 2016
Azimuth ambiguities appear widely throughout spaceborne Synthetic Aperture Radar (SAR) images. If the ambiguous energy is relatively strong, a large number of brilliant areas or points will emerge, which may be erroneously judged as actual targets.
Xiao Peng, Wu Youming, Yu Ze, Li Chunsheng   +3 more
doaj   +1 more source

Tomographic Performance of Multi-Static Radar Formations: Theory and Simulations

Remote Sensing, 2021
3D imaging of Earth’s surface layers (such as canopy, sub-surface, or ice) requires not just the penetration of radar signal into the medium, but also the ability to discriminate multiple scatterers within a slant-range and azimuth resolution cell.
Ilgin Seker, Marco Lavalle
doaj   +1 more source

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   +1 more source

Comparison of Raw Data-Based and Complex Image-Based Sparse SAR Imaging Methods

Sensors, 2019
Sparse signal processing has already been introduced to synthetic aperture radar (SAR), which shows potential in improving imaging performance based on raw data or a complex image.
Zhilin Xu, Bingchen Zhang, Hui Bi, Chenyang Wu, Zhonghao Wei   +4 more
doaj   +1 more source

Real‐Time Ferroelectric Domain Wall Dynamics During Electric Poling and Depoling

Advanced Science, EarlyView.
Real‐time visualization of domain wall dynamics during alternating‐current poling, direct‐current poling, and electrical depoling in relaxor‐PT ferroelectric single crystals reveals distinct field‐dependent pathways and strong path dependence. Instant polarized light microscopy uncovers reversible domain wall nucleation, motion, and reconfiguration ...
Ziqi Wang, Zhengze Xu, Anastasia Timofeeva, Hossam Elnaggar, Sipan Liu, Yusen Pei, Reece Henry, Brendan O'Connor, Eunkyoung Shim, Franky So, Kara Peters, Xiaoning Jiang, Jun Liu   +12 more
wiley   +1 more source

Cross‐scale Material‐Structure Synergy for 2D Metamaterials: Toward Customizable Intelligent Electromagnetic Manipulation in Multiphysics Fields

Advanced Science, EarlyView.
Recent advances in metasurface‐enabled low‐observable technologies are reviewed from the perspective of cross‐scale material–structure synergy. Electromagnetic, thermal, optical, and acoustic stealth are highlighted together with dynamic tuning, programmable coding, data‐driven inverse design, artificial intelligence, multispectral compatibility, and ...
Shuhao Wang, Xing Yang, Liping Liu, Yang Peng, Yangyang Wang, Hualiang Lv   +5 more
wiley   +1 more source

Grating‐Lens Empowered Metafiber for Large‐Angle Light Collection With 3D Nanoprinted Structures

Laser &Photonics Reviews, EarlyView.
A grating‐lens‐based Metafiber enables efficient light coupling into single‐mode fibers at large incidence angles. By combining diffraction and focusing on the fiber facet using a 3D nanoprinted holographic structure, light is selectively coupled only at specific angles while suppressing unwanted signals. This approach achieves high coupling efficiency
Jun Sun, Markus A. Schmidt
wiley   +1 more source

Femtosecond‐Laser‐Inscribed Cladding Fiber Bragg Gratings: Architectures, Design Trade‐Offs and Future Sensing Opportunities

Laser &Photonics Reviews, EarlyView.
Femtosecond‐laser inscription enables precise positioning of fiber Bragg gratings within the cladding, introducing new spatial and modal design freedoms. Auxiliary‐waveguide, near‐core evanescent‐field, and direct cladding‐mode‐excitation architectures provide complementary pathways toward multiparameter, vector, distributed, and environmentally ...
Koustav Dey, Rex E. Gerald, Chen Zhu, Jie Huang   +3 more
wiley   +1 more source

Image-Domain Discrimination of Real Ship Targets and Azimuth-Ambiguity Ghosts in Maritime SAR Images

IEEE Access
Azimuth ambiguities in maritime synthetic aperture radar (SAR) images can generate ghost-like responses near strong ship scatterers, thereby increasing false alarms and degrading ship-target interpretation and automatic target recognition.
Min-Seok Kang, Seung-Jae Lee, Sanghyuck Han   +2 more
doaj   +1 more source