Results 61 to 70 of about 127 (116)

An Antenna Array with Wide Flat-Top Beam and Low Sidelobes for Aerial Target Detection

Sensors
The misuse of drone technology poses significant risks to public and personal safety, emphasizing the need for accurate and efficient aerial target detection to prevent detection failures due to randomly distributed airborne targets and mitigate ...
Liangzhou Li, Yan Dong, Xiao Cai, Jingqian Tian   +3 more
doaj   +1 more source

FLEXIBLE ARRAY BEAMPATTERN SYNTHESIS USING HYPERGEOMETRIC FUNCTIONS

Progress In Electromagnetics Research M, 2011
For array beampattern synthesis, it is possible to simplify the model and reduce the computational load by formulating it to be a Quadratic Programming (QP) problem. Moreover, the QP method is conceptually simple and also ∞exible and convenient for the constrained problems.
Lei Tu, Boon Poh Ng
openaire   +1 more source

Beampattern Synthesis for Discrete Phase RIS in Communication and Sensing Systems

CoRR
Extensive research on Reconfigurable Intelligent Surfaces (RIS) has primarily focused on optimizing reflective coefficients for passive beamforming in specific target directions. This optimization typically assumes prior knowledge of the target direction, which is unavailable before the target is detected.
Xiao Cai, Hei Victor Cheng, Daniel E. Lucani   +2 more
openaire   +3 more sources

Constant Modulus Wideband MIMO Radar Waveform Design for Transmit Beampattern and Angular Waveform Synthesis

Remote Sensing
A linear frequency modulation (LFM) signal and its corresponding de-chirp operation are one of the basic methods for wideband radar signal processing, which can reduce the burden of the radar system sampling rate and is more suitable for large-bandwidth ...
Hao Zheng, Xiaoxia Zhang, Shubin Wang, Junkun Yan   +3 more
doaj   +1 more source

MIMO Beampattern Synthesis Using Adaptive Frequency Modulated Waveforms

2024 58th Asilomar Conference on Signals, Systems, and Computers
To appear in the proceedings of the 2024 IEEE Asilomar Conference on Signals, Systems, and ...
openaire   +3 more sources

Research on Dynamic Beamforming Methods for Uniform Circular Frequency Diverse Array Sonar

Journal of Marine Science and Engineering
Frequency diverse array (FDA) sonar achieves a range- and azimuth-dependent transmit beam by applying a small frequency increment to each transmitting element.
Weiye Liu, Yixin Yang
doaj   +1 more source

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Transmit Beampattern Synthesis for the FDA Radar

IEEE Antennas and Wireless Propagation Letters, 2018
The frequency diverse array (FDA) radar has drawn great attention due to the periodicity of the beampattern in range, angle, and time. In this letter, we restudy the recent work that designed a time-invariant beampattern of the FDA radar, which can focus the transmit energy in a desired position.
Baoxin Chen, Xiaolong Chen
exaly   +2 more sources

A Unified Sparse Array Design Framework for Beampattern Synthesis

Signal Processing, 2021
Abstract A smaller number of transmit antennas can reduce the array system cost, while sparse antenna design can provide additional degrees of freedom to beampattern synthesis. It is also known that the min-max beampattern matching design criterion can synthesize beampattern with small mainlobe ripple, low peak sidelobe level, and specified null ...
Hing Cheung So, Junli Liang, Wen Fan
exaly   +2 more sources

Fuzzy Entropy for Frequency Diverse Array Beampattern Synthesis

IEEE Transactions on Antennas and Propagation, 2022
Jiaang Ge, Junwei Xie, Chushu Chen
exaly   +2 more sources