Results 51 to 60 of about 2,086,551 (203)

High Precision Antenna Characterisation for Broadband Synthetic Aperture Radar Processing [PDF]

, 2014
The airborne F-SAR sensor\cite{fsar}, developed and operated by the DLR-HR institute, acquires very high resolution, fully polarimetric synthetic aperture radar (SAR) data in multiple frequency bands in addition to providing a number of ...
Bernd Gabler, Gabler, Bernd, Jäger, Marc, Andreas Reigber, Reigber, Andreas, Marc Jager   +5 more
core   +1 more source

Micro-Doppler Signal Time-Frequency Algorithm Based on STFRFT

Sensors, 2016
This paper proposes a time-frequency algorithm based on short-time fractional order Fourier transformation (STFRFT) for identification of a complicated movement targets. This algorithm, consisting of a STFRFT order-changing and quick selection method, is
Cunsuo Pang, Yan Han, Huiling Hou, Shengheng Liu, Nan Zhang   +4 more
doaj   +1 more source

Pattern‐Aware Intelligence Enables Nondestructive, Rapid Quantification of High‐Aspect‐Ratio Silicon Etching

Advanced Science, EarlyView.
Pattern‐dependent etching is converted into a physical prior for intelligent reconstruction of high‐aspect‐ratio silicon structures. Combining YOLO‐Pose feature extraction with a topography network, the framework retrieves depth, sidewall angle, and scallop texture from minimal destructive observations, enabling accurate cross‐scale metrology and near ...
Shuyan He, Lang Chen, Bo Wen, Yufeng Jin, Wei Wang   +4 more
wiley   +1 more source

Precise motion compensation method in terahertz ISAR imaging based on sharpness maximization

Electronics Letters, 2022
According to the characteristics of the manoeuvring targets and the superiorities of Terahertz Inverse Synthetic Aperture Radar (THz‐ISAR), a precise motion compensation method based on image sharpness maximization for manoeuvring targets in the ...
Hetong Wang, Qi Yang, Hongqiang Wang, Bin Deng   +3 more
doaj   +1 more source

Smart Multi-Aperture Radar Techniques for Spaceborne Remote Sensing [PDF]

, 2008
Data compression is crucial for modern synthetic aperture radar systems where high resolution or large coverage may result in huge amounts of raw data.
Bordoni, Federica, Federica Bordoni, Nicolas Gebert, Younis, Marwan, Gebert, Nicolas, Krieger, Gerhard, Marwan Younis, Gerhard Krieger   +7 more
core   +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

Compressed sensing of monostatic and multistatic SAR [PDF]

, 2013
In this letter, we study the impact of compressed data collections from a synthetic aperture radar (SAR) sensor on the reconstruction quality of a scene of interest.
Çetin, Müjdat, W. Clem Karlb, Mujdat Cetinc, Stojanovic, Ivana, Karl, W. Clem, Ivana Stojanovica   +5 more
core   +1 more source

Modeling and monitoring injectivity evolution during cold CO2 injection with field evidence from aquistore carbon capture and storage operations

Deep Underground Science and Engineering, EarlyView.
This work integrates 5 years of field data from the Aquistore CCS project with a non‐isothermal THM modeling framework to explain how cold CO2 injection alters injectivity over time. The study shows that sustained cooling near the wellbore reduces effective stresses, promotes tensile micro‑cracking, and leads to semi‑reversible permeability enhancement
Alireza Rangriz Shokri, Stephen Talman, Erik Nickel, Rick Chalaturnyk   +3 more
wiley   +1 more source

A Downsamplable Inverse ERMA Method for Hybrid SAR-ISAR Imaging Framework of Maneuvering Ship Target

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
For radar imaging of the maneuvering ship target, the synthetic aperture radar-inverse mapping-inverse synthetic aperture radar (SAR-IM-ISAR) framework using range migration algorithm (RMA) suffers from high computational complexity in IM and ISAR ...
Zhixin Wu, Yanbin Liu, Shuxian Dong, Yang Liu, Min Xue, Yuexin Gao, Letian Guo, Mengdao Xing   +7 more
doaj   +1 more source

SA-ISAR imaging algorithm based on the gradient signal recovery method

The Journal of Engineering, 2019
As the radar system tends to be complex, obtaining well-focused images with discontinued apertures becomes a challenge. Here, a new sparse aperture inverse synthetic aperture radar (SA-ISAR) imaging approach through the signal recovery method is proposed.
Bingren Ji, Bin Zhao, Yong Wang, Rongqing Xu   +3 more
doaj   +1 more source