Results 31 to 40 of about 141,741 (141)

Low‐RCS High‐Gain Broadband Substrate‐Integrated Waveguide Antenna Based on Elliptical Polarisation Conversion Metasurface

IET Microwaves, Antennas & Propagation
An elliptical polarisation conversion metasurface (PCM) is proposed for Ka‐band applications, integrated with a high‐gain substrate‐integrated waveguide (SIW) antenna to achieve significant radar cross section (RCS) reduction.
Cuiqin Zhao, Dongya Shen
doaj   +1 more source

SNR‐dependent drone classification using convolutional neural networks

IET Radar, Sonar & Navigation, 2022
Radar sensing offers a method of achieving 24‐h all‐weather drone surveillance, but in order to be maximally effective, systems need to be able to discriminate between birds and drones.
Holly Dale, Chris Baker, Michail Antoniou, Mohammed Jahangir, George Atkinson, Stephen Harman   +5 more
doaj   +1 more source

Influence of grain size, shape and compaction on georadar waves: example of an Aeolian dune

, 2012
Many Ground Penetrating Radar (GPR) profiles acquired in dry aeolian environment have shown good reflectivity inside present-day dunes. We show that the origin of this reflectivity is related to changes in grain size distribution, packing and/or grain ...
Adetunji, Annan, Asami, Atkins, Bagnold, Bano, Bano, Bano, Barndorf-Nielsen, Bayard, Boyle, Bristow, Bristow, Bristow, Bruggeman, Costas, Davis, Greaves, Gómez-Ortiz, Hanai, Harari, Hunter, Jackson, Jean-Remi Dujardin, Jiao, Jol, Julien Guillemoteau, Koltermann, Lancaster, Lehmann, Maksim Bano, Marion, Maxwell-Garnett, McGeary, Mendelson, Mountney, Neal, Otto, Robinson, Robinson, Sen, Shenk, Sihvola, Stratton, Thomas, Von Hippel, Wang, Watson, Widess, Zeng   +49 more
core   +5 more sources

Hybrid Frequency‐Polarisation Coding Method for Chipless Radio‐Frequency Identification Tags With Angular Orientation

IET Microwaves, Antennas & Propagation
In this paper, a hybrid coding method for chipless radio‐frequency identification (RFID) tag with angular orientation is proposed. Frequency‐shift coding is achieved by controlling the size of three complementary split single ring resonators (CSSRR). And
Zilong Chen, Yang Yang, Xiaoxiang He, Shengchuan Xiao   +3 more
doaj   +1 more source

A Study of Ineffective Investment Trust and Precious Metal Mining Issues [PDF]

, 1937
Inobject/target reconstruction and recognition based on laser radar data, the range value's accuracy is important. The range data accuracy depends on the accuracy in the laser radar's detector, especially the algorithm used for time-of-flight estimation.
Chevalier, Tomas, Grönwall, Christina, Gustafsson, Fredrik, Steinvall, Ove   +3 more
core   +1 more source

Aluminium Feeds for Reflector for NadirSAR [PDF]

, 2018
With the long term aim of developing a NadirSAR quadrotor UAV system specialized for monitoring broad acre grain fields, a large aperture load bearing antenna to use as the main structural element was sort.
Gray, Derek, Le Kernec, Julien
core   +1 more source

Ocean Surface Cross Section for Bistatic HF Radar Incorporating a Six DOF Oscillation Motion Model

Remote Sensing, 2019
To investigate the characteristics of sea clutter, based on ocean surface electromagnetic scattering theory, the first- and second-order ocean surface scattering cross sections for bistatic high-frequency (HF) radar incorporating a multi-frequency six ...
Guowei Yao, Junhao Xie, Weimin Huang
doaj   +1 more source

Combined EISCAT radar and optical multispectral and tomographic observations of black aurora [PDF]

, 2008
Black auroras are recognized as spatially well-defined regions within a uniform diffuse auroral background where the optical emission is significantly reduced.
Blixt, E. M., Brändström, B. U. E., Gustavsson, B., Kavanagh, Andrew J., Kosch, Mike J., Senior, Andrew   +5 more
core   +1 more source

Statistical analysis of the radar cross section of two small fixed‐wing drones using typical flights

IET Radar, Sonar & Navigation
The presence and importance of small drones (unmanned aerial vehicles) are increasing. With traditional radar detection the target radar cross section and its statistical properties are needed in order to design the detector and to assess detection ...
Svante Björklund, Harald Hernnäs
doaj   +1 more source

The Radar Coverage Estimation under Multiple Antennas and Targets

Zanco Journal of Pure and Applied Sciences, 2019
Choosing the suitable antenna type for a particular application has importance in meeting the desired system objects. In this paper the comparative studies between three different types of antenna, which are phased array, planar array and parabolic ...
Arazoo Mustafa Aziz
doaj   +1 more source