Results 121 to 130 of about 6,564,297 (383)

Observation of the Earth by radar [PDF]

open access: yes
Techniques and applications of radar observation from Earth satellites are discussed. Images processing and analysis of these images are discussed. Also discussed is radar imaging from aircraft.
Elachi, C.
core   +1 more source

Millisecond‐Switching Dual‐Band/Dual‐Polarization Ka‐Band Wavefront Control Enabled by a Complementary Liquid‐Crystal Metasurface

open access: yesAdvanced Materials Technologies, EarlyView.
An LCD‐compatible complementary liquid‐crystal metasurface delivers dual‐band, dual‐polarized Ka‐band wavefront control with millisecond switching via a 10‐µm LC gap. Interlaced patch/slot pairs enable independent phase tuning at 28 and 38 GHz, while strategic 45° slot rotation suppresses parasitic resonances. Measurements on a 160 × 160‐cell prototype
Daehyeon Kim   +4 more
wiley   +1 more source

Applications of active microwave imagery [PDF]

open access: yes
The following topics were discussed in reference to active microwave applications: (1) Use of imaging radar to improve the data collection/analysis process; (2) Data collection tasks for radar that other systems will not perform; (3) Data reduction ...
Childs, L. F.   +9 more
core   +1 more source

Ka-band microwave photonic ultra-wideband imaging radar for capturing quantitative target information.

open access: yesOptics Express, 2018
Extracting precise target characteristics from microwave image is needed and calls for high-resolution microwave imaging radar systems. In this paper, a Ka-band ultra-wideband microwave photonic (MWP) imaging radar is developed and experimentally ...
Anle Wang   +11 more
semanticscholar   +1 more source

Submicron Patterning Techniques for Perovskite Optoelectronics From Materials Challenges to Scalable Device Integration

open access: yesAdvanced Optical Materials, EarlyView.
This review highlights submicron patterning strategies for metal halide perovskites, focusing on solvent compatibility, resolution, and alignment toward scalable integration in advanced optoelectronic systems. Abstract Halide perovskites are promising materials for future optoelectronic and display systems.
Dante Ahn   +4 more
wiley   +1 more source

Development of a synthetic aperture radar design approach for wide-swath implementation [PDF]

open access: yes
The first phase of a study program to develop an advanced synthetic aperture radar design concept is presented. Attributes of particular importance for the system design include wide swath coverage, reduced power requirements, and versatility in the ...
Jean, B. R.
core   +1 more source

0D Cesium Lanthanide Chlorides: Spectroscopic Insights and Optical Properties for Emerging Optoelectronic Applications

open access: yesAdvanced Optical Materials, EarlyView.
Trivalent lanthanides or rare earth elements are positioning themselves as “critical and strategic minerals” due to their significance in securing technological supremacy in the modern world. At present, a huge demand of rare earth elements in numerous sectors is witnessed, such as optoelectronics, telecommunications, military systems, renewable energy,
Sheikh Jobe   +5 more
wiley   +1 more source

Guaranteed Stability of Sparse Recovery in Distributed Compressive Sensing MIMO Radar

open access: yesInternational Journal of Antennas and Propagation, 2015
Low SNR condition has been a big challenge in the face of distributed compressive sensing MIMO radar (DCS-MIMO radar) and noise in measurements would decrease performance of radar system.
Yu Tao, Gong Zhang, Jindong Zhang
doaj   +1 more source

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