Results 71 to 80 of about 6,207 (200)

Voice and Position Simultaneous Communication System Based on Beidou Navigation Constellation

Xibei Gongye Daxue Xuebao, 2020
Considering China Beidou has unique two-way communication capability for short messages that are not available in other navigation systems such as GPS, a 600bps vocoder adapted to the short message channel of Beidou is developed.

doaj   +1 more source

Tracing Three Decades of Low Earth Orbit Satellite Communication Development: A Bibliometric and Main Path Analysis of Network Architectures, Protocol Evolution, and Emerging Intelligent Services

International Journal of Satellite Communications and Networking, Volume 44, Issue 5, Page 573-593, September/October 2026.
ABSTRACT Low Earth Orbit (LEO) satellite communication systems have evolved into a critical component of global broadband networks, enabling wide‐area connectivity, IoT services, and intelligent multilayer satellite–terrestrial integration. Despite rapid advancements in constellation deployment, routing mechanisms, resource management, and LEO–5G/6G ...
Wei‐Hao Su, Ya‐Chen Chuang, Long‐Sheng Chen   +2 more
wiley   +1 more source

A Systematic Review and Taxonomy of Fall Detection in Geriatric Care: Current State, Challenges, and Applications

WIREs Data Mining and Knowledge Discovery, Volume 16, Issue 3, September 2026.
Overview of fall‐detection approaches and technologies in geriatric care. ABSTRACT This systematic review provides a critical examination of fall detection (FD) technologies in geriatric care, analyzing both technological innovations and implementation challenges across diverse healthcare environments.
Hamid Ali, Ji Zhang, Xiaohui Tao, Raj Gururajan, Xujuan Zhou, Yuquan Gan, Josh Jia‐Ching Ying   +6 more
wiley   +1 more source

Wide area kinematic positioning with BeiDou triple frequency signals

, 2016
A key challenge of wide area kinematic positioning is to overcome the effects of the varying hardware biases in code signals of the BeiDou system. Based on three geometryfree/ionosphere-free combinations, the elevation-dependent code biases are modelled ...
Yanming Feng, Shengfeng Gu, Gong, Xiaopeng, Xiaopeng Gong, Yongchao Wang, Feng, Yanming, Gu, Shengfeng, Wang, Yongchao   +7 more
core   +1 more source

THE DEVELOPMENT OF NAVIGATION SYSTEMS IN CIVIL AVIATION

Научный вестник МГТУ ГА, 2017
The article describes the history of navigation systems formation, such as "Cicada" system, which at that time could compete with the US "Transit", European, Chinese Beidou navigation system and the Japanese Quasi-Zenit.The detailed information about ...
A. S. Stepanenko
doaj  

The High‐Latitude Workbox for the Ionosphere (HAWK‐I): A New Toolkit for Real‐Time Specification of the Arctic Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract The high‐latitude ionosphere exhibits rapid spatial and temporal variability during geomagnetically active periods, creating persistent challenges for accurate nowcasts. The High‐latitude Workbox for the Ionosphere (HAWK‐I) is a real‐time ionosphere nowcast and specification system designed for operational deployment to address these ...
Patrick Dandenault, Clayton Cantrall, Robert Schaefer, Sebastijan Mrak, Giuseppe Romeo, Lisa Knowles, Cathryn Mitchell, Gary Bust   +7 more
wiley   +1 more source

Integrating GPS, GLONASS, BeiDou, and Galileo Receivers to Overcome Signal Blocking Challenges [PDF]

Iranian Journal of Electrical and Electronic Engineering
Blocking interference poses significant challenges to the accuracy and reliability of navigation systems by obstructing the communication path. Single-frequency receivers are generally more susceptible to blocking interference due to their limited ...
K. Bahmani, A. Sadr, M. R. Mosavi
doaj  

Beyond SMAP: Can GNSS‐R Platforms Ensure Continuity of Global Soil Moisture Observations?

Water Resources Research, Volume 62, Issue 9, September 2026.
Abstract The absence of a definitive follow‐on strategy for the Soil Moisture Active Passive (SMAP) mission, which has already surpassed its planned mission lifetime, presents a significant challenge for the hydrological science community. GNSS‐Reflectometry (GNSS‐R), which exploits reflected satellite navigation signals, has emerged as a rapidly ...
Ehsan Jalilvand, Sujay V. Kumar, Rajat Bindlish, Jerry W. Wegiel, Mehmet Kurum, Hyunglok Kim, Pang‐Wei Liu, Mahdi Navari   +7 more
wiley   +1 more source

GmERF109 Positively Enhances Soybean Resistance to Phytophthora sojae by Transcriptionally Activating GmG4DT‐Like to Promote Glyceollin I Accumulation

Molecular Plant Pathology, Volume 27, Issue 9, September 2026.
GmERF109 is strongly induced in P. sojae‐resistant but not susceptible soybeans. GmERF109 functions as a nuclear AP2/ERF transcription factor, P. sojae directly binding the GCC‐box to activate GmG4DT‐like expression. The GmERF109–GmG4DT‐like module enhances glyceollin I accumulation for soybean resistance to P. sojae.
Xin Fang, Rui Liang, Yiling Cheng, Hong Gao, Chuanzhong Zhang, Jingcan Sun, Junjun Song, Gengpu Zhang, Meng Liu, Yuxin Zhao, Yan Sun, Xiran Wang, Xiaoyu Chen, Kexin Ma, Shuo Wang, Kexin Li, Jiapeng Tong, Junjiang Wu, Pengfei Xu, Shuzhen Zhang   +19 more
wiley   +1 more source

Control System for the Navigation of the Agricultural Robots: A Review

Journal of Field Robotics, Volume 43, Issue 5, Page 3474-3505, August 2026.
ABSTRACT Control systems for the navigation of autonomous agricultural robots—particularly those operating in uneven terrain and in the presence of static or dynamic obstacles—have advanced considerably in recent years. As conventional machinery evolves toward increasingly automated systems, the design of reliable navigation controllers has become ...
Edna Carolina Moriones Polanía, Hugo Rafacho Fernandes, Daniel Albiero, Angel Pontin Garcia   +3 more
wiley   +1 more source