Results 1 to 10 of about 4,714 (163)

Compressed Sensing-Based Genetic Markov Localization for Mobile Transmitters

Drones, 2023
With the strengths of quickness, low cost, and adaptability, unmanned aerial vehicle (UAV) communication is widely utilized in the next-generation wireless network.
Sai Huang, Yuqing Chai, Shanchuan Ying, Shuo Chang, Nan Xia   +4 more
doaj   +1 more source

Spatial Spectrum-Based Channel Estimation for Wideband mmWave System With Beam Squint

IEEE Access, 2021
Channel estimation for millimeter wave (mmWave) systems is challenging due to their large antenna arrays. Owing to the sparse scattering nature of the mmWave channel, channel estimation can be performed by estimating the directions and the gains of paths.
Hongkang Yu, Pengxin Guan, Yiru Wang, Yuping Zhao   +3 more
doaj   +1 more source

Satellite Interference Source Direction of Arrival (DOA) Estimation Based on Frequency Domain Covariance Matrix Reconstruction

Sensors, 2023
Direction of arrival (DOA) estimation is an effective method for detecting various active interference signals during the satellite navigation process. It can be utilized for both interference detection and anti-interference applications.
Jinjie Yao, Changchun Zhao, Jiansheng Bai, Yang Ren, Yangyang Wang, Jing Miao   +5 more
doaj   +1 more source

Simulation of the spatial distribution of scattered light under illumination of a resonant diffraction grating with structured light

Компьютерная оптика, 2023
In this paper, a comparative theoretical analysis and numerical simulation of the operation of various types of diffraction gratings in the far field is carried out using a Fourier transform.
S.N. Khonina, Yu.V. Kapitonov
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Forest stand spectrum reconstruction using spectrum spatial feature gathering and multilayer perceptron

Frontiers in Plant Science, 2023
IntroductionThree-dimensional spectral distributions of forest stands can provide spatial information on the physiological and biochemical status of forests, which is vital for forest management.
Fan Wang, Fan Wang, Linghan Song, Linghan Song, Xiaojie Liu, Xiaojie Liu, Shuangwen Zhong, Shuangwen Zhong, Jiawei Wang, Jiawei Wang, Yao Zhang, Yao Zhang, Yun Wu, Yun Wu   +13 more
doaj   +1 more source

On the Coherence Relationship between Measurement Matrices and Equivalent Radiation Sources in Microwave Computational Imaging Applications

Applied Sciences, 2019
In recent years, computational imaging, which encodes scene information into a set of measurements, has become a research focus in the field of microwave imaging.
Jian Guan, Weidong Chen
doaj   +1 more source

Theoretical analysis and experimental verification of wideband multiple-input multiple-output imaging radar

The Journal of Engineering, 2019
Multiple-input multiple-output (MIMO) radar is a novel radar system which can achieve more individual observation echoes than the number of the actual antennas by transmitting orthogonal waveforms.
Jingyang Wang, Cheng Hu, Weiming Tian, Rui Wang   +3 more
doaj   +1 more source

Spatial Spectrum Estimation of Co-Channel Direct Signal in Passive Radar Based on Coprime Array

Remote Sensing, 2022
The received signal of passive radar based on mobile communication signals contains direct and multipath interference (DMI) signals from multiple co-channel base stations (CCBS). The direct signal spatial spectrum of each CCBS should be obtained first to
Haodong Xu, Haitao Wang, Kefei Liao, Shan Ouyang, Yanyun Gong   +4 more
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Spectrum Extension of a Real-Aperture Microwave Radiometer Using a Spectrum Extension Convolutional Neural Network for Spatial Resolution Enhancement

Remote Sensing, 2023
Enhancing the spatial resolution of real-aperture microwave radiometers is an essential research topic. The accuracy of the numerical values of brightness temperatures (BTs) observed using microwave radiometers directly affects the precision of the ...
Guanghui Zhao, Yuhang Huang, Chengwang Xiao, Zhiwei Chen, Wenjing Wang   +4 more
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PRINCIPLES OF FORMATION OF STRUCTURAL GEOLOGICAL MODELS OF HETEROGENEOUS LAYERED BOTTOM

Геологія і корисні копалини Світового океану, 2021
The article describes the developed and implemented analytical and numerical methods for modeling layered geological structures with cavities of simple and complex shape. The developed author’s analytical and numerical methods of mathematical modeling of
Shundel O.I.
doaj   +1 more source