Results 31 to 40 of about 2,700,967 (284)

Robust Space Time Adaptive Processing Methods for Synthetic Aperture Radar

Applied Sciences, 2020
This paper proposes two modified space time adaptive processing (STAP) methods based on piecewise sub-apertures and data constraints for non-stationary interference cancellation in synthetic aperture radar (SAR) applications. In these methods, the entire
Shijian Shen, Lan Tang, Xin Nie, Yechao Bai, Xinggan Zhang, Pin Li   +5 more
doaj   +1 more source

Multipath Reflectivity Estimation in Urban Environments for Synthetic Aperture Radar Images [PDF]

, 2010
Synthetic Aperture Radar (SAR) images a target region reflectivity function in the multi-dimensional spatial domain of range and cross-range. SAR synthesizes a large aperture radar in order to achieve a finer azimuth resolution than the one provided by ...
Arriba Ruiz, Imanol de, F. Perez-Martinez, Muñoz Ferreras, José María, Pérez Martínez, Félix, I. de Arriba-Ruiz, J. M. Munoz-Ferreras, Pérez-Martínez, F., Muñoz-Ferreras, J. M., De Arriba-Ruiz, I.   +8 more
core   +1 more source

Multichannel and Wide-Angle SAR Imaging Based on Compressed Sensing

Sensors, 2017
The multichannel or wide-angle imaging performance of synthetic aperture radar (SAR) can be improved by applying the compressed sensing (CS) theory to each channel or sub-aperture image formation independently.
Chao Sun, Baoping Wang, Yang Fang, Zuxun Song, Shuzhen Wang   +4 more
doaj   +1 more source

Application of invariant moment method for HAPS ISAR imaging with micro parts

Tongxin xuebao, 2013
To resolve the micromotion in the HAPS(high altitude platform station) ISAR system,the invariant moment method for ISAR imaging with micro parts was proposed.Firstly,invariant moment tool was applied to classify the echoes of different sub-aperture,and ...
Zhao-qun QI, Xiao-jun JING, Si-qing YOU, Hai-bin SUN   +3 more
doaj   +2 more sources

Ultrahigh Resolution ISAR Imaging of a Target With Unknown and Complex Motion Using SA-NCS Algorithm

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
In this manuscript, a novel inverse synthetic aperture radar (ISAR) imaging method for a large target under ultrahigh resolution condition is proposed.
Yuexin Gao, Hanwen Yu, Min Xue, Jianlai Chen   +3 more
doaj   +1 more source

Modified real-time sub-aperture processing algorithm for airborne high-resolution SAR

The Journal of Engineering, 2019
The problem of real-time imaging in synthetic aperture radar (SAR) system is addressed here. Sub-aperture processing algorithm is usually used in the engineering applications.
Jing Liu, Hongmeng Chen, Hanwei Sun, Jiahao Lin, Congxin Li   +4 more
doaj   +1 more source

Tip/tilt Alignment for a Fizeau Interferometer via Defocus-Based Sub-Spot Separation

IEEE Photonics Journal, 2020
It is a crucial premise for Fizeau interferometric imaging that all the optical axes of sub-apertures are well aligned. What is challenging in tip/tilt alignment of such interferometers is the superposition of all the sub-aperture spots on the ...
Wenyi Lv, Zongliang Xie, Qiang Wang, Haotong Ma, Jianliang Shi, Yang Liu, Kaiyuan Yang, Botao Chen, Yongmei Huang   +8 more
doaj   +1 more source

Stitching sub-aperture in digital holography based on machine learning

Optics Express, 2020
Sub-aperture stitching in digital holography (DH) is a very important issue both for the spatial resolution improvement as well as for measuring larger aperture through synthetic enlargement of numerical aperture. In fact, sub-apertures stitching permits to greatly expand the capabilities of optical metrology thus allowing to accurately measure complex
Pan F, Dong B, Xiao W, Ferraro P
openaire   +4 more sources

Extraordinary optical transmission and second harmonic generation in sub–10-nm plasmonic coaxial aperture

Nanophotonics, 2020
Recent development in nanofabrication technology has enabled the fabrication of plasmonic nanoapertures that can provide strong field concentrations beyond the diffraction limit. Further utilization of plasmonic nanoaperture requires the broadband tuning
Lee Jaehak, Yang Suyeon, Lee Jihye, Choi Jun-Hyuk, Lee Yong-Hee, Shin Jung H., Seo Min-Kyo   +6 more
doaj   +1 more source

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration

Sensors, 2022
With the successful application of the Shack–Hartmann wavefront sensor in measuring aberrations of the human eye, researchers found that, when the aberration is large, the local wavefront distortion is large, and it causes the spot corresponding to the ...
Wen Yang, Jianli Wang, Bin Wang
doaj   +1 more source