Results 61 to 70 of about 4,913 (184)

Low Profile and Multiband Antenna Based on Binary Encoding and Multiobjective Optimization With Artificial Intelligence

International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.
This paper presents a low profile and multiband antenna based on binary encoding and multiobjective optimization using artificial intelligence (AI). The antenna adopts a single‐arm helical structure on the top layer and two metal parasitic middle layers above the ground. The parasitic layers are composed of 10 × 10 rectangular squares, being similar as
Wenbo Geng, Guolin Tong, Ayan Chatterjee
wiley   +1 more source

Doppler effects in UAV‐to‐vehicle multipath channels under 6D mobility

IET Microwaves, Antennas &Propagation, Volume 18, Issue 12, Page 1042-1054, December 2024.
In this paper, a geometry‐based stochastic model framework for U2V communication is studied, with consideration of the movement of a UAV in both three‐dimensional (3D) translational and 3D rotational directions, as well as a ground vehicle capable of moving in arbitrary directions with varying velocities. The Doppler shift expressions for various paths
Junwei Bao, Zhuangzhuang Cui, Yang Miao, Qiuming Zhu, Kai Mao, Boyu Hua   +5 more
wiley   +1 more source

A cost-effective decentralized vehicle remote positioning and tracking system using BeiDou Navigation Satellite System and Mobile Network

EURASIP Journal on Wireless Communications and Networking, 2019
Most existing production vehicle tracking services rely on the Global Positioning System (GPS) and a proprietary server/client infrastructure. This type of inflexible and centralized architecture incurs severe vender-dependency and high service cost.
Jingfa Wei, Chui-Hui Chiu, Feijiang Huang, Junjun Zhang, C. Cai   +4 more
semanticscholar   +2 more sources

Midlatitude Plasma Blob‐like Structures Along With Super Equatorial Plasma Bubbles During the May 2024 Great Geomagnetic Storm

Geophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract Plasma blob is generally a low‐latitude phenomenon occurring at the poleward edge of equatorial plasma bubble (EPB) during post‐sunset periods. Here we report a case of midlatitude ionospheric plasma blob‐like structures occurring along with super EPBs over East Asia around sunrise during the May 2024 great geomagnetic storm.
Wenjie Sun, Guozhu Li, Biqiang Zhao, Shun‐Rong Zhang, Yuichi Otsuka, Lianhuan Hu, Guofeng Dai, Xiukuan Zhao, Haiyong Xie, Yi Li, Jianfei Liu, Yu Li, Baiqi Ning, Libo Liu, Atsuki Shinbori, Michi Nishioka, Septi Perwitasari   +16 more
wiley   +1 more source

Architecture design of BeiDou global navigation signals

Geo-spatial Information Science
Navigation signals play a crucial role in determining the performance and user experience of Global Navigation Satellite System (GNSS). In recent years, GNSSs have been actively modernizing their signal architectures to meet the increasing demand for ...
Shuren Guo, Chengeng Su, Feiren Lv
doaj   +1 more source

A Gaussian Variogram‐Based Model of Total Electron Content in the Regional Ionosphere of China

Space Weather, Volume 22, Issue 11, November 2024.
Abstract This study utilizes ionospheric total electron contents (TECs) data from China and its surrounding areas to compute the regional ionospheric semi‐variance using the Gaussian variogram. The regional ionospheric model is then constructed by introducing an additional stochastic term, named adjusted Spherical Harmonics Adding KrigING method ...
Ang Liu, Zishen Li, Ningbo Wang, Ang Li, Zhouyu Zhang, Yunlong Zhang   +5 more
wiley   +1 more source

Sea Surface Height Estimation by Ground-Based BDS GEO Satellite Reflectometry

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Chinese BeiDou Navigation Satellite System (BDS) as a mixed constellation consists of not only medium earth orbit (MEO) satellites but also inclined geosynchronous orbit and geostationary earth orbit (GEO) satellites, of which the GEO satellites remain ...
Jianming Wu, Yanling Chen, Fan Gao, Peng Guo, Xiaoya Wang, Xinliang Niu, Mengjie Wu, Naifeng Fu   +7 more
doaj   +1 more source

Mainlobe and sidelobe jamming suppression method based on distributed array radar with eigen‐projection matrix processing and null constraints

IET Radar, Sonar &Navigation, Volume 18, Issue 11, Page 2212-2221, November 2024.
A mainlobe and sidelobe jamming suppression method with eigen‐projection matrix processing (EMP) and null constraints is proposed based on the distributed array radar. In the proposed method, EMP beamforming is performed in subarrays for sidelobe jamming suppression, and null constraints are applied to suppress the residual jamming in auxiliary arrays.
Bowen Han, Xiaopeng Yang, Qiang Lv, Wolin Li, Zhengyan Zhang, Shichao Zhong   +5 more
wiley   +1 more source

Site selection analysis of radio monitoring stations to BDS based on STK orbital prediction data

Dianxin kexue, 2018
BeiDou navigation satellite system (BDS) is a global navigation satellite system constructed and operated by China.At present,BDS is able to provide location,navigation and time service in Asia-Pacific,and will provide global service in 2020 as planned ...
Qi ZHANG, Hui LIN
doaj   +2 more sources

Satellite-Ground Two-Way Measuring Method and Performance Evaluation of BDS-3 Inter-Satellite Link System

IEEE Access, 2020
From November 2017 to December 2018, Beidou navigation satellite system (BDS) completed the basic system construction of Beidou-3 system (BDS-3) and opened the initial service, BDS-3 satellites are equipped with Ka-band inter-satellite link (ISL ...
Yan Bai, Yanming Guo, Xin Wang, Xiaochun Lu   +3 more
doaj   +1 more source