Improvement of the signal-to-noise ratio in static-mode down-looking synthetic aperture imaging ladar

2015 ◽  
Author(s):  
Zhiyong Lu ◽  
Jianfeng Sun ◽  
Ning Zhang ◽  
Yu Zhou ◽  
Guangyu Cai ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Synthetic Aperture ◽  
Signal To Noise ◽  
Synthetic Aperture Imaging ◽  
Static Mode ◽  
Noise Ratio

Research on the Signal-to-Noise Ratio in Sliding Spotlight Mode Down-Looking Synthetic Aperture Imaging Ladar

2016 ◽  
Vol 36 (8) ◽  
pp. 0828001
Author(s):  
张宁 Zhang Ning ◽  
卢智勇 Lu Zhiyong ◽  
孙建锋 Sun Jianfeng ◽  
周煜 Zhou Yu ◽  
栾竹 Luan Zhu ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Synthetic Aperture ◽  
Signal To Noise ◽  
Synthetic Aperture Imaging ◽  
Noise Ratio

Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar

2017 ◽  
Vol 15 (10) ◽  
pp. 102801 ◽  
Author(s):  
Guo Zhang Guo Zhang ◽  
Jianfeng Sun Jianfeng Sun ◽  
Yu Zhou Yu Zhou ◽  
Zhiyong Lu Zhiyong Lu ◽  
Guangyuan Li Guangyuan Li ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Synthetic Aperture ◽  
Signal To Noise ◽  
Synthetic Aperture Imaging ◽  
Noise Ratio

Analog–digital conversion signal-to-noise ratio analysis for synthetic aperture interferometric radiometer

2014 ◽  
Vol 8 (1) ◽  
pp. 083635 ◽  
Author(s):  
Jin Zhang ◽  
Zhiping Li ◽  
Cheng Zheng ◽  
Xianxun Yao ◽  
Baohua Yang ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Synthetic Aperture ◽  
Ratio Analysis ◽  
Signal To Noise ◽  
Digital Conversion ◽  
Noise Ratio

scholarly journals Application of Synthetic Aperture Focusing Technique for inspection of plate-like structures using EMAT generated Lamb waves

2018 ◽  
Vol 145 ◽  
pp. 05010
Author(s):  
Yordan Mirchev ◽  
Krasimir Staykov ◽  
Damyan Ganchev
Keyword(s):  
Lamb Waves ◽  
Signal To Noise Ratio ◽  
Guided Wave ◽  
Synthetic Aperture ◽  
Defect Characterization ◽  
Signal To Noise ◽  
Main Challenge ◽  
Noise Ratio ◽  
Synthetic Aperture Focusing ◽  
Synthetic Aperture Focusing Technique

The main challenge for guided wave inspection is exact defect characterization and sizing. EMAT generated Lamb waves usually have low signal-to-noise ratio which reduces the defect detection, characterization and sizing capabilities. That's why in most cases the method is used only as a screening tool. The Synthetic Aperture Focusing Technique is a process that increases the signal-to-noise ratio by numerically focusing the acoustic fields. In this paper the application of SAFT is tested over EMAT generated Lamb waves. The improvement of lateral resolution and signal-to-noise ratio is evaluated. Results are presented as a comparison between standard B-scan and SAFT processed data.

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