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

scholarly journals Noise-Robust Range Alignment Method for Inverse Synthetic Aperture Radar Based on Aperture Segmentation and Average Range Profile Correlation

2020 ◽  
Author(s):  
Yue Lu ◽  
Jian Yang ◽  
Yue Zhang ◽  
Shiyou Xu
Keyword(s):  
Synthetic Aperture Radar ◽  
Signal To Noise Ratio ◽  
Radar Imaging ◽  
Synthetic Aperture ◽  
Minimum Entropy ◽  
Inverse Synthetic Aperture Radar ◽  
Signal To Noise ◽  
Range Alignment ◽  
Noise Ratio ◽  
Aperture Radar

Abstract Range alignment is an essential procedure in the translation motion compensation of inverse synthetic aperture radar imaging. Global optimization or maximum-correlation-based algorithms have been used to realize range alignment. However, it is still challenging to achieve range alignment in low signal-to-noise ratio scenarios, which are common in inverse synthetic aperture radar imaging. In this paper, a novelanti-noise range alignment approach is proposed. In this new method, the target motion is modelled as a uniformly accelerated motion during a short sub-aperture time. Minimum entropy optimization is implemented to estimate the motion parameters in each sub-aperture. These estimated parameters can be used to align the profiles of the current sub-aperture. Once the range profiles of eachsub-aperture are aligned, the non-coherent accumulation gain is obtained by averaging all profiles in each sub-aperture, which can be used as valuable information. The accumulation and correlation method is applied to align the average range profiles of each sub-aperture because the former step focuses mainly on alignment within the sub-apertures. Experimental results based on simulated and real measured data demonstrate the effectiveness of the proposed algorithm in low signal-to-noise ratio scenarios.

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
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