scholarly journals INFLUENCE OF NOISE ON SUBWAVELENGTH IMAGING OF TWO CLOSE SCATTERERS USING TIME REVERSAL METHOD: THEORY AND EXPERIMENTS

2009 ◽  
Vol 98 ◽  
pp. 333-358 ◽  
Author(s):  
Matthieu Davy ◽  
Jean-Gabriel Minonzio ◽  
Julien de Rosny ◽  
Claire Prada ◽  
Mathias Fink
Keyword(s):  
Time Reversal ◽  
Subwavelength Imaging ◽  
Influence Of Noise ◽  
Theory And Experiments

A Hybrid Synthetic Aperture and Time-Reversal MUSIC Algorithm for Subwavelength Radar Imaging

2021 ◽  
Author(s):  
Nathaniel Tamminga ◽  
Brianna Christensen ◽  
Sarah Petry ◽  
Enson Chang
Keyword(s):  
Synthetic Aperture Radar ◽  
Millimeter Wave ◽  
Time Reversal ◽  
Radar Imaging ◽  
Synthetic Aperture ◽  
Music Algorithm ◽  
Subwavelength Imaging ◽  
Chipless Rfid ◽  
Imaging Approach ◽  
Printing Cost

A promising chipless RFID approach uses millimeter-wave synthetic aperture radar (SAR) to image metal ink-printed ID tags from a meter or more away. Due to printing cost, it is desirable to minimize the size and spacing of metal patches within a tag, preferably into the subwavelength regime. Although circular SAR (CSAR) has a sharply peaked point response in 2D, its side lobes of closely-spaced targets interfere strongly with each other to distort the image. An alternative 2D subwavelength imaging approach with minimal side lobes is Time-Reversal MUSIC (TR-MUSIC). Traditional TR-MUSIC, however, requires a large number of transmitters and receivers. We propose a hybrid synthetic aperture TR-MUSIC algorithm (SATR-MUSIC) that combines the benefits of both approaches. Using relatively few transceivers, SATR-MUSIC is able to resolve objects separated by approximately  in 2D with minimal background artifacts. It does so by averaging TR-MUSIC’s imaging kernel incoherently over the synthetic aperture.

Time reversal of ultrasonic waves in solids: Theory and experiments

1995 ◽  
Vol 98 (5) ◽  
pp. 2875-2875 ◽  
Author(s):  
Carsten Draeger ◽  
Didier Cassereau ◽  
Mathias Fink
Keyword(s):  
Time Reversal ◽  
Ultrasonic Waves ◽  
Theory And Experiments

scholarly journals Far-field time reversal subwavelength imaging of sources based on grating structure

2017 ◽  
Vol 66 (4) ◽  
pp. 044101
Author(s):  
Gong Zhi-Shuang ◽  
Wang Bing-Zhong ◽  
Wang Ren ◽  
Zang Rui ◽  
Wang Xiao-Hua
Keyword(s):  
Time Reversal ◽  
Far Field ◽  
Subwavelength Imaging ◽  
Grating Structure

Time Reversal in Lossy Material: An Assessment

PIERS Online ◽  
2006 ◽  
Vol 3 (8) ◽  
pp. 1259-1263
Author(s):  
Ian Scott ◽  
Ana Vukovic ◽  
Phillip Sewell
Keyword(s):  
Time Reversal ◽  
Lossy Material

TECHNICAL SEISMICITY AND STRUCTURAL NOISE SPREADING FROM TRANSPORT - THEIR INFLUENCE ON BUILDINGS CONSTRUCTIONS

Akustika ◽  
2020 ◽  
Vol 36 (36) ◽  
pp. 35-45
Author(s):  
Jana Dolejší ◽  
Jan Dolejší
Keyword(s):  
Urban Areas ◽  
Rail Transport ◽  
Building Construction ◽  
Building Structures ◽  
Structural Noise ◽  
Railway Tunnel ◽  
Noise And Vibration ◽  
Influence Of Noise

This paper deals with the influence of noise and vibration sources from which vibrations propagate through subsoil into building structures. Structural noise is usually then emitted by building structures into interiors. Especially within city centers and urban areas the approach of building construction towards sources such as road and rail transport differ in particular, whether the objects are located directly above the metro or railway tunnel, or objects close to roads or railways.

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