Influence of Atmospheric Propagation Effects on Holographic Imaging Techniques

1976 ◽  
pp. 455-463
Author(s):  
M. E. Bechtel ◽  
D. T. Gjessing ◽  
G. Graf ◽  
O. Loevhaugen ◽  
K. Magura ◽  
...  
Keyword(s):  
Imaging Techniques ◽  
Holographic Imaging ◽  
Atmospheric Propagation ◽  
Propagation Effects

EYESAFE ACTIVE IMAGING OF HARD TARGETS: AN OVERVIEW OF TECHNIQUES UNDER INVESTIGATION BY NVESD

2008 ◽  
Vol 18 (02) ◽  
pp. 375-391 ◽  
Author(s):  
BRADLEY W. SCHILLING ◽  
STEPHEN R. CHINN ◽  
BRIAN THOMAS ◽  
TIMOTHY J. SCHOLZ
Keyword(s):  
Target Identification ◽  
Imaging Techniques ◽  
Low Cost ◽  
Short Wave ◽  
Laser Radar ◽  
Ground Vehicles ◽  
Atmospheric Propagation ◽  
Active Imaging ◽  
Resolution Imaging ◽  
Laser Sources

The U.S. Army is actively pursuing 3D active imaging techniques using laser sources emitting at 1.5 μm. This eyesafe short wave infrared (SWIR) waveband is advantageous due to both the improved eye safety and atmospheric propagation through obscurants. NVESD has several active programs in this area, which will be reviewed in this paper. These are: 1) single-pixel scanned imaging laser radar, 2) 2D gated SWIR imaging, and 3) 3D-flash laser radar. These systems are being evaluated for various targeting scenarios, including as potential payloads on unmanned air-vehicles, ground vehicles and other sensor suites. Applications include low-cost long-range target identification, identification of heavily obscured targets, obstacle avoidance, and high resolution imaging.

scholarly journals Assessment of Atmospheric Propagation Effects in SAR Images

2009 ◽  
Vol 47 (10) ◽  
pp. 3507-3518 ◽  
Author(s):  
A. Danklmayer ◽  
B.J. Doring ◽  
M. Schwerdt ◽  
M. Chandra
Keyword(s):  
Sar Images ◽  
Atmospheric Propagation ◽  
Propagation Effects

scholarly journals Three-Dimensional Holographic Imaging Using Single Frequency Microwave Data

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Reza K. Amineh ◽  
Maryam Ravan ◽  
Raveena Sharma ◽  
Smit Baua
Keyword(s):  
3D Imaging ◽  
Imaging Techniques ◽  
Three Dimensional ◽  
Single Frequency ◽  
Low Frequencies ◽  
Reconstruction Process ◽  
Security Screening ◽  
Holographic Imaging ◽  
Wave Imaging ◽  
The Media

Three-dimensional (3D) microwave and millimeter wave imaging techniques based on the holographic principles have been successfully employed in several applications such as security screening, body shape measurement for the apparel industry, underground imaging, and wall imaging. The previously proposed 3D holographic imaging techniques require the acquisition of wideband data over rectangular or cylindrical apertures. Requirement for wideband data imposes limitations on the hardware (in particular at very high or very low frequencies). It may also lead to errors in the produced images if the media is dispersive (e.g., in biomedical imaging) and not modeled properly in the image reconstruction process. To address these limitations, here, we propose a technique to perform 3D imaging with single frequency data. Instead of collecting data at multiple frequencies, we acquire the backscattered fields with an array of resonant antennas. We demonstrate the possibility of 3D imaging with the proposed setup and perform a comprehensive study of the capabilities and limitations of the technique via simulations. To perform a realistic study, the simulation data is contaminated by noise.

scholarly journals Super-resolution Holographic Imaging Techniques Using a Synthetic Aperture

2012 ◽  
Vol 21 (5) ◽  
pp. 27
Author(s):  
Jaeduck JANG ◽  
Jung Hoon PARK ◽  
KyooHyun KIM ◽  
Hyeonseung YU ◽  
YongKeun PARK
Keyword(s):  
Imaging Techniques ◽  
Super Resolution ◽  
Synthetic Aperture ◽  
Holographic Imaging

Degenerate Volume Holographic Imaging Techniques and Instruments for Subsurface Tissue Visualization

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
R. K. Kostuk ◽  
I. Howlett ◽  
M. Gordon ◽  
J. Brownlee ◽  
E. De Leon ◽  
...  
Keyword(s):  
Imaging Techniques ◽  
Holographic Imaging
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