Results 31 to 40 of about 127 (116)

A Short-Range Range-Angle Dependent Beampattern Synthesis by Frequency Diverse Array

IEEE Access, 2018
In this paper, we propose a new technique to generate a range-angle dependent transmit beampattern by introducing a nonlinear frequency modulation scheme based on arctangent function in the frequency diverse array (FDA) system. The propagation process of
Zhonghan Wang, Yaoliang Song, Tong Mu, Zeeshan Ahmad   +3 more
doaj   +1 more source

Impact of Biomimetic Pinna Shape Variation on Clutter Echoes: A Machine Learning Approach

Advanced Intelligent Systems, Volume 8, Issue 2, February 2026.
Bats with dynamic ear structures navigate dense, echo‐rich environments, yet the echoes they receive are highly random. This study shows that machine learning can reliably detect structural signatures in these seemingly chaotic biosonar signals. The results open new directions for biologically inspired sensing, where time‐varying receiver shapes ...
Ibrahim Eshera, Sanmeel Lagad, Rolf Müller   +2 more
wiley   +1 more source

Combining multibeam and single beam echosounders for quantifying gas bubble release from the seafloor

Limnology and Oceanography: Methods, Volume 24, Issue 2, February 2026.
Abstract Marine gas bubble release is a worldwide phenomenon that impacts the local marine ecosystem and contributes to carbon fluxes with respect to global warming. It is still challenging to assess gas flow for large seep areas (tens of km2), but recent advances in calibrating and processing multibeam echosounder (MBES) data make this problem ...
P. Urban, M. E. Veloso‐Alarcón, J. Greinert   +2 more
wiley   +1 more source

Hybrid optimisation algorithm and its application for pattern synthesis of planar arrays

The Journal of Engineering, 2019
A hybrid approach to the synthesis of sparse arrays radiating shaped or focused beampattern is presented in this paper. Specifically, an iterative scheme is used where the prescribed pattern response in the mainlobe peak direction is cast as a multi ...
Zhengdong Qi, Yangyi Lu, Yue Kong, Youji Cong   +3 more
doaj   +1 more source

Artificial Noise Aided Directional Modulation with Multilog Frequency Diverse Array

IET Communications, Volume 20, Issue 1, January/December 2026.
The basic principle of the proposed AN‐DM‐MFDA system is to allocate AN to leakage sidelobes instead of uniformly transmitting on the two‐dimensional plane. Moreover, we theoretically derive the average bit error rates as well as the secrecy capacity between the legitimate receiver and eavesdropper in the developed system.
Ji Liu, Yue Xiao, Yong Wang, Xia Lei
wiley   +1 more source

Beamforming Optimization in Internet of Things Applications Using Robust Swarm Algorithm in Conjunction with Connectable and Collaborative Sensors

Sensors, 2020
The integration of the Internet of Things (IoT) with Wireless Sensor Networks (WSNs) typically involves multihop relaying combined with sophisticated signal processing to serve as an information provider for several applications such as smart grids ...
Mohammed Zaki Hasan, Hussain Al-Rizzo
doaj   +1 more source

Array Antenna Radiation Pattern Synthesis Using Mixture Density Networks With Iterative Retraining

IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.
This study proposes an antenna radiation pattern synthesis method using mixture density networks (MDNs) with an iterative retraining strategy to solve the ‘one‐to‐many’ mapping problem. The proposed framework effectively learns and infers array phases and is capable of generating feasible solutions even for target radiation patterns where exact ...
Je‐Heon Lee, Hyeon‐Chang Seong, Jungsuek Oh, Jae Hee Kim   +3 more
wiley   +1 more source

Beampattern Synthesis for Frequency Diverse Array Based on Time-Modulated Double Parameters Approach

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
The basic frequency diverse array (FDA) using linearly increasing frequency increments generates a range-angle dependent beampattern. However, it is coupled in range and angle dimensions and is also periodic in range and time, making its applications ...
Tong Mu, Yaoliang Song, Zhonghan Wang
doaj   +1 more source

Equiripple MIMO Beampattern Synthesis Using Chebyshev Approximation

IEEE Signal Processing Letters
Paper has been accepted in IEEE Signal Processing Letters.
David A. Hague, David G. Felton
openaire   +2 more sources

Multispectrally Constrained Waveform Design for MIMO Radar Direction Finding

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This paper focuses on the design of transmit waveforms for multiple‐input‐multiple‐output (MIMO) radar systems in a spectrally crowded environment. The purpose is to improve the angle estimation performance of MIMO radar by minimising the asymptotic estimation bound of multiple signal classification (MUSIC) algorithm.
Da Li, Xingyu Wang, Xiangyu Wu, Cheng Zhou, Yuxue Sun   +4 more
wiley   +1 more source