Results 91 to 100 of about 30,948 (265)
A Modified Hierarchical Vision Transformer for Soil Moisture Retrieval From CYGNSS Data
Water Resources Research, Volume 62, Issue 1, January 2026.Abstract This research introduces a new deep learning (DL) framework, multi‐head self‐attention‐aided vision Transformer (MSA‐ViT), for soil moisture (SM) retrieval using Cyclone Global Navigation Satellite System (CYGNSS) data. We first assess the sensitivity of CYGNSS reflectivity (Γ) $({\Gamma })$ to SM, demonstrating a strong physical linkage ...
Qingyun Yan +4 more
wiley +1 more source
Research on Full-polarization Bistatic Scattering Characteristics of Aircraft
Leida xuebao, 2016 Whole space polarimetric bistatic scattering data of full-size aircraft targets were calculated via the mature electromagnetic calculation software. The fluctuation statistics characteristic of the polarimetric bistatic Radar Cross-Section (RCS) was ...
Ai Xiaofeng +4 more
doaj +1 more source
Increased Range Bistatic Scatter Radio
IEEE Transactions on Communications, 2014 Scatter radio achieves communication by reflection and requires low-cost and low-power RF front-ends. However, its use in wireless sensor networks (WSNs) is limited, since commercial scatter radio (e.g. RFID) offers short ranges of a few tens of meters.
Μπλετσας Αγγελος(http://users.isc.tuc.gr/~abletsas) +3 more
openaire +2 more sources
The First Results of Ionospheric Skywave Propagation Experiment Over Taiwan
Radio Science, Volume 61, Issue 1, January 2026.Abstract An ionospheric over‐the‐horizon propagation experiment was carried out in Taiwan to investigate characteristics of ionospheric F layer skywave propagation at frequencies 4–12 MHz. Experimental results show that there are prominent diurnal variations in the incident angle, virtual height and plasma frequency at reflection height, which are ...
Hung‐Shi Lin +3 more
wiley +1 more source
IET Cyber-Systems and Robotics, Volume 8, Issue 1, January/December 2026.ABSTRACT With the rapid proliferation of unmanned aerial vehicles (UAVs) in the military, logistics and public safety sectors, the threat of illegal intrusion, information theft, and security breaches has increased. This paper provides a comprehensive review of recent developments in counter‐unmanned aerial vehicle (counter‐UAV) systems, focussing on ...
Lei Xing, Can Cui, Miao Wang, Chao Xu
wiley +1 more source
A Novel Higher Order Local Time‐Stepping Technique for the DGTD–FDTD Method
Electronics Letters, Volume 62, Issue 1, January/December 2026.A novel higher order local time‐stepping (LTS) technique is developed for the DGTD–FDTD (discontinuous Galerkin time‐domain–finite difference time‐domain) method to accelerate transient electromagnetic simulations. By applying a higher order equation to boundary elements between LTS classes, the method reduces approximation errors caused by LTS.
Qingkai Wu +5 more
wiley +1 more source
Electronics Letters, Volume 62, Issue 1, January/December 2026.This letter presents an efficient method to evaluate the bistatic scattering cross section of conductive and dielectric wedges using the subdomain method and the surface equivalence principle. The proposed formulation enables closed‐form far‐field evaluation and significantly reduces computation time compared with the conventional surface‐current ...
SangKyu Kim
wiley +1 more source
IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.The study presents the design and development of a plasma‐based antenna array system for the UHF band. The system features an omnidirectional plasma antenna as its active radiator, a novel approach that has not been previously explored. Surrounding plasma reflectors form a reconfigurable array around the monopole plasma antenna for beam shaping and ...
Manisha Jha +5 more
wiley +1 more source
IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.In this article, we provide a Gaussian beam‐based method to compute the RCS of dielectric and dielectric‐coated targets in both the monostatic and bistatic cases. ABSTRACT This study proposes to extend and refine the methodology of Gaussian beam summation (GBS) for computing the radar cross section (RCS) of dielectric targets in both monostatic and ...
Thomas Bonnafont +3 more
wiley +1 more source
Extending Loffeld's bistatic formula for the general bistatic SAR configuration
IET Radar, Sonar & Navigation, 2010 This study derives an accurate bistatic point target reference spectrum based on a zeroth-order polynomial model. The spectrum contains only two hyperbolic square root terms that are very analogous in form to the analytical monostatic spectrum. The new formulation can be considered as an improvement of the Loffeld's bistatic formula (LBF) and allows it
R. Wang +4 more
openaire +1 more source