Phase error suppression by low-pass filtering for synthetic aperture imaging ladar

2014 ◽  
Author(s):  
Zhiwei Sun ◽  
Peipei Hou ◽  
Ya'nan Zhi ◽  
Jianfeng Sun ◽  
Yu Zhou ◽  
...  
Keyword(s):  
Phase Error ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
Low Pass ◽  
Error Suppression

Phase error correction by phase differential algorithm for synthetic aperture imaging ladar

2012 ◽  
Author(s):  
Ya'nan Zhi ◽  
Jianfeng Sun ◽  
Peipei Hou ◽  
Enwen Dai ◽  
Yu Zhou ◽  
...  
Keyword(s):  
Error Correction ◽  
Phase Error ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
Differential Algorithm

Impact and correction of phase error in ladar signal on synthetic aperture imaging

2018 ◽  
Vol 47 (3) ◽  
pp. 306001
Author(s):  
胡烜 Hu Xuan ◽  
李道京 Li Daojing ◽  
田鹤 Tian He ◽  
赵绪锋 Zhao Xufeng
Keyword(s):  
Phase Error ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging

Golay Coded Sequences in Synthetic Aperture Imaging Systems

2011 ◽  
Vol 36 (4) ◽  
Author(s):  
Ihor Trots ◽  
Yuriy Tasinkevych ◽  
Andrzej Nowicki ◽  
Marcin Lewandowski
Keyword(s):  
Imaging Systems ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging

scholarly journals Synthetic Aperture Imaging Using High-Frequency Convex Array for Ophthalmic Ultrasound Applications

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2275
Author(s):  
Hae Gyun Lim ◽  
Hyung Ham Kim ◽  
Changhan Yoon
Keyword(s):  
Image Quality ◽  
Penetration Depth ◽  
Spatial Resolution ◽  
High Frequency ◽  
Imaging System ◽  
Ex Vivo ◽  
Synthetic Aperture ◽  
Single Element ◽  
High Frequency Ultrasound ◽  
Synthetic Aperture Imaging

High-frequency ultrasound (HFUS) imaging has emerged as an essential tool for pre-clinical studies and clinical applications such as ophthalmic and dermatologic imaging. HFUS imaging systems based on array transducers capable of dynamic receive focusing have considerably improved the image quality in terms of spatial resolution and signal-to-noise ratio (SNR) compared to those by the single-element transducer-based one. However, the array system still suffers from low spatial resolution and SNR in out-of-focus regions, resulting in a blurred image and a limited penetration depth. In this paper, we present synthetic aperture imaging with a virtual source (SA-VS) for an ophthalmic application using a high-frequency convex array transducer. The performances of the SA-VS were evaluated with phantom and ex vivo experiments in comparison with the conventional dynamic receive focusing method. Pre-beamformed radio-frequency (RF) data from phantoms and excised bovine eye were acquired using a custom-built 64-channel imaging system. In the phantom experiments, the SA-VS method showed improved lateral resolution (>10%) and sidelobe level (>4.4 dB) compared to those by the conventional method. The SNR was also improved, resulting in an increased penetration depth: 16 mm and 23 mm for the conventional and SA-VS methods, respectively. Ex vivo images with the SA-VS showed improved image quality at the entire depth and visualized structures that were obscured by noise in conventional imaging.

scholarly journals REGULARIZATION IMAGING ALGORITHM WITH ACCURATE G MATRIX FOR NEAR-FIELD MMW SYNTHETIC APERTURE IMAGING RADIOMETER

2014 ◽  
Vol 58 ◽  
pp. 193-203 ◽  
Author(s):  
Jianfei Chen ◽  
Yuehua Li ◽  
Jianqiao Wang ◽  
Yuanjiang Li ◽  
Yilong Zhang
Keyword(s):  
Near Field ◽  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
Imaging Algorithm

A channel phase error compensation method for multi-channel synthetic aperture ladar

Optik ◽  
2019 ◽  
Vol 178 ◽  
pp. 830-840
Author(s):  
Shuai Wang ◽  
Maosheng Xiang ◽  
Bingnan Wang ◽  
Fubo Zhang ◽  
Yirong Wu
Keyword(s):  
Error Compensation ◽  
Phase Error ◽  
Compensation Method ◽  
Synthetic Aperture

Precipitation mapping with an airborne synthetic aperture imaging radar

1977 ◽  
Vol 82 (24) ◽  
pp. 3445-3451 ◽  
Author(s):  
David Atlas ◽  
Charles Elachi ◽  
Walter E. Brown
Keyword(s):  
Synthetic Aperture ◽  
Synthetic Aperture Imaging ◽  
Imaging Radar
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