Summary and Expectation of Synthetic Aperture Imaging towards High-Orbit Objects

2014 ◽  
Vol 599-601 ◽  
pp. 1745-1748
Author(s):  
Xi Yu Li ◽  
Xin Gao ◽  
Jia Tang ◽  
Chang Ming Lu
Keyword(s):  
High Resolution ◽  
Atmospheric Turbulence ◽  
Synthetic Aperture ◽  
Imaging Method ◽  
Large Telescope ◽  
Intensity Correlation ◽  
Synthetic Aperture Imaging ◽  
Satellite Imaging ◽  
Orbit Satellite ◽  
High Orbit

The resolution of ground-based large aperture adaptive telescope which is limited by diffraction and atmospheric turbulence can’t achieve the demand of high-orbit satellite imaging, while synthetic aperture imaging can get high resolution without using large telescope. In this paper, we analyzed the merits and demerits of several synthetic aperture imaging method such as amplitude interference imaging, intensity correlation imaging, and Fourier telescope which can be used in high-orbit satellite imaging. According to the analysis we prospected for the development of synthetic aperture imaging method towards high-orbit satellite in the future

Amelioration of Intensity Correlation Array towards High-Orbit Satellite Imaging

2015 ◽  
Vol 44 (6) ◽  
pp. 611002
Author(s):  
李希宇 LI Xi-yu ◽  
高昕 GAO Xin ◽  
唐嘉 TANG Jia ◽  
冯灵洁 FENG Ling-jie
Keyword(s):  
Intensity Correlation ◽  
Satellite Imaging ◽  
Orbit Satellite ◽  
High Orbit

scholarly journals Photonics-based broadband radar for high-resolution and real-time inverse synthetic aperture imaging

2017 ◽  
Vol 25 (14) ◽  
pp. 16274 ◽  
Author(s):  
Fangzheng Zhang ◽  
Qingshui Guo ◽  
Ziqian Wang ◽  
Pei Zhou ◽  
Guoqiang Zhang ◽  
...  
Keyword(s):  
High Resolution ◽  
Real Time ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging

scholarly journals Spherical Scanning 3-D Microwave Imaging of Near-field Scatterers Mutually Coupled With an Antenna Array

2021 ◽  
Author(s):  
Takuma Watanabe ◽  
Hiroyoshi Yamada
Keyword(s):  
Antenna Array ◽  
Imaging Techniques ◽  
Near Field ◽  
Image Resolution ◽  
Synthetic Aperture ◽  
Simple Extension ◽  
Imaging Method ◽  
Synthetic Aperture Imaging ◽  
Spherical Antenna ◽  
Simulation Based

<div>*This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible.<br></div><div><br></div>In this article, we propose a 3-D synthetic aperture imaging method with spherical antenna scanning to identify scatterers located close to an antenna array, such as fixtures or support of the antenna. Previous studies have shown that 2-D and 3-D synthetic aperture imaging techniques with planar, circular, and cylindrical scanning can successfully reconstruct spatial images of near-field scatterers. The spherical scanning approach considered in this article is expected to improve the 3-D image resolution because more angular diversity can be achieved in the elevation direction. However, as we show in this study, simple extension of the previous techniques to the spherical case results in undesired blur artifacts in the reconstructed image. To overcome this problem, we introduce a correction factor in the image reconstruction. The proposed imaging algorithm is validated by numerical electromagnetic simulation based on the method of moments.

An optimized laser ultrasonic synthetic aperture imaging method using differential technique

2021 ◽  
pp. 2150345
Author(s):  
Zhengliang Hu ◽  
Jinxing Huang ◽  
Pan Xu ◽  
Kang Lou ◽  
Min Zhu ◽  
...  
Keyword(s):  
Element Model ◽  
Original Data ◽  
High Amplitude ◽  
Synthetic Aperture ◽  
Imaging Method ◽  
Internal Defects ◽  
Laser Ultrasonic ◽  
Synthetic Aperture Imaging ◽  
Reflected Waves ◽  
Differential Technique

Laser ultrasonic synthetic aperture focusing technique (SAFT) is susceptible to multiple modes of ultrasonic generated by laser pulse. In this work, we propose an optimized synthetic aperture imaging method based on the differential technique, resulting in the effective detection of internal defects. The laser ultrasonic SAFT finite element model is established, and the models are calculated in the case of existing internal defect or not. Thereby, the original ultrasonic data containing the defect reflected waves and the differential data are obtained, and the internal defects are reconstructed by the delay superposition algorithm. The results show that the defect imaging is submerged in the high-amplitude background noise superimposed by the surface acoustic wave; when only the original data are used. However, the optimized SAFT imaging based on the differential technique can not only reduce the interference of other mode waves on the imaging area significantly, but also retain the defect reflected waves effectively. Moreover, the imaging and precise locating of multiple defects are realized, which pave the way for enhancing the internal defects detection ability of laser ultrasonic.

scholarly journals Spherical Scanning 3-D Microwave Imaging of Near-field Scatterers Mutually Coupled With an Antenna Array

2021 ◽  
Author(s):  
Takuma Watanabe ◽  
Hiroyoshi Yamada
Keyword(s):  
Antenna Array ◽  
Imaging Techniques ◽  
Near Field ◽  
Image Resolution ◽  
Synthetic Aperture ◽  
Simple Extension ◽  
Imaging Method ◽  
Synthetic Aperture Imaging ◽  
Spherical Antenna ◽  
Simulation Based

<div>*This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible.<br></div><div><br></div>In this article, we propose a 3-D synthetic aperture imaging method with spherical antenna scanning to identify scatterers located close to an antenna array, such as fixtures or support of the antenna. Previous studies have shown that 2-D and 3-D synthetic aperture imaging techniques with planar, circular, and cylindrical scanning can successfully reconstruct spatial images of near-field scatterers. The spherical scanning approach considered in this article is expected to improve the 3-D image resolution because more angular diversity can be achieved in the elevation direction. However, as we show in this study, simple extension of the previous techniques to the spherical case results in undesired blur artifacts in the reconstructed image. To overcome this problem, we introduce a correction factor in the image reconstruction. The proposed imaging algorithm is validated by numerical electromagnetic simulation based on the method of moments.

scholarly journals High-Resolution 3-D Refractive Index Tomography and 2-D Synthetic Aperture Imaging of Live Phytoplankton

2014 ◽  
Vol 18 (6) ◽  
pp. 691-697 ◽  
Author(s):  
SangYun Lee ◽  
Kyoohyun Kim ◽  
Adam Mubarok ◽  
Adisetyo Panduwirawan ◽  
KyeoReh Lee ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Resolution ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging
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