Results 81 to 90 of about 5,138,507 (193)

Detection Performance of Noncoherent Radar: MIMO Radar, Phased Array Radar, Directional MIMO Radar

The Journal of Korean Institute of Communications and Information Sciences, 2011
In a traditional phased array radar, closely spaced antenna elements transmit a scaled version of single waveform to maximize the signal energy. On the contrary, a multiple-input multiple-output (MIMO) radar consists of widely separated antennas and transmits an arbitrary waveform from each antenna element.
Chan-Ho An, Jang-Hoon Yang, Ui-Young Pak, Young-Jae Ryu, Duk-Chan Han, Dong-Ku Kim   +5 more
openaire   +2 more sources

INTERFERENCE OF RADAR DETECTION OF DRONES BY BIRDS

Progress In Electromagnetics Research M, 2019
Recently, consumer drones have encroached upon airports and pose a potential threat to aviation safety. Radar is an effective remote sensing tool to detect and track flying drones. Radar echoes from flying birds are assumed to be clutters when a radar is
Jiangkun Gong, Jun Yan, Deren Li, Deyong Kong, Huiping Hu   +4 more
semanticscholar   +1 more source

Observation of edge solitons and transitions between them in a trimer circuit lattice

Communications Physics
In nonlinear topological systems, edge solitons either originate from linear topological edge modes or emerge as nonlinearity-induced localized states without topological protection.
Rujiang Li, Xiangyu Kong, Wencai Wang, Yixi Wang, Yongtao Jia, Huibin Tao, Pengfei Li, Ying Liu, Boris A. Malomed   +8 more
doaj   +1 more source

Unimodular Multi-Input Multi-Output Waveform and Mismatch Filter Design for Saturated Forward Jamming Suppression

Sensors
Forward jammers replicate and retransmit radar signals back to generate coherent jamming signals and false targets, making anti-jamming an urgent issue in electronic warfare.
Xuan Fang, Dehua Zhao, Liang Zhang
doaj   +1 more source

Diagnosis of array antennas based on near-field data using Faster R-CNN

Materials & Design
In this paper, a source reconstruction method for detecting failures in array antenna elements using near-field data based on Faster region-convolutional neural network (Faster R-CNN) is introduced.
Boguang Yang, Yulun Wei, Jixiang Shi, Tao Hong, Liangyu Li, Kai-Da Xu   +5 more
doaj   +1 more source

Grounded L-Shaped Corner-Embraced Patch Array Polarization Conversion Metasurface Compatible with Multiband and Broadband Characteristics

Micromachines
We propose a linear polarization rotator metasurface composed of a grounded array of L-shaped corner-embraced patches. Both simulation and experimental results confirm that the metasurface achieves a polarization conversion ratio exceeding 90% across ...
Shi Kong, Yifei Zhang, Ziheng Fu, Rui Yang   +3 more
doaj   +1 more source

Radar and video as the perfect match : a cooperative method for sensor fusion [PDF]

, 2019
Accurate detection and tracking of road users is essential for driverless cars and many other smart mobility applications. As no single sensor can provide the required accuracy and robustness, the output from several sensors needs to be combined ...
Allebosch, Gianni, Dimitrievski, Martin, Jacobs, Lennert, Van Hamme, David   +3 more
core  

Forked-Crossing Metasurface for Multi-Band Polarization Conversion with Distinct Bandwidths

Micromachines
This study presents a reflective and highly efficient multi-band metasurface polarization converter based on a forked-crossing patch array. Both simulation and experimental results reveal that such a metasurface achieves polarization conversion ratio ...
Pengpeng Zhang, Yifei Zhang, Ziang Li, Rui Yang   +3 more
doaj   +1 more source

Radar shadow detection in SAR images using DEM and projections

, 2013
Synthetic aperture radar (SAR) images are widely used in target recognition tasks nowadays. In this letter, we propose an automatic approach for radar shadow detection and extraction from SAR images utilizing geometric projections along with the digital ...
Haddad, O., Prasath, V. B. S.
core   +2 more sources

Active control of single-photon spontaneous emission out-coupling enhancement by rotation modulation of hyperbolic metamaterials

iScience
Summary: Controlling the rate and direction of spontaneous emission is critical for quantum technologies such as single-photon sources and secure communications. We propose a tunable nanophotonic device that modulates spontaneous emission by rotating the
Yubin Ma, Muhammad Imran, Muhideen Yahya Musa, Shafi Ullah Khan, Rujiang Li   +4 more
doaj   +1 more source