Results 51 to 60 of about 12,661 (218)

An Integrated Vessel Tracking System by Using AIS, Inmarsat and China Beidou Navigation Satellite System [PDF]

TransNav, 2012
As there are more and more Automatic Identification System (AIS) sets have been deployed onboard, it is getting easier for people to trace vessels. Today, many online vessel monitoring services have been developed; however, most of them are based on AIS ...
Chun Yang, Qinyou Hu, Xinghua Tu, Jie Geng   +3 more
doaj  

Design of Beidou timing module

IOP Conference Series: Earth and Environmental Science, 2020
Abstract The Beidou timing module receives the Beidou Satellite Information, calculates the time and positioning information, transmits the time and timing information through various external interfaces, and has the function of short message forwarding. This paper presents a system design scheme for the Beidou time-keeping module, which
openaire   +1 more source

Review of code and phase biases in multi-GNSS positioning [PDF]

, 2016
A review of the research conducted until present on the subject of Global Navigation Satellite System (GNSS) hardware-induced phase and code biases is here provided. Biases in GNSS positioning occur because of imperfections and/or physical limitations in
A Al-Shaery, A Leick, A Tetewsky, Anna B. O. Jensen, B Hoffman-Wellenhof, C Cai, C Deng, D Laurichesse, D Odijk, E Sardon, GE Lanyi, Gunnar Hedling, H He, J Chen, J Geng, J Kouba, J Paziewski, J Tegedor, J-M Sleewaegen, JF Zumberge, JM Dow, L Wanninger, M Ge, Martin Håkansson, Milan Horemuz, P Collins, P Teunissen, PJG Teunissen, PJG Teunissen, S Banville, S Banville, S Chuang, S Gleason, W Bertiger, X Li, Y Gao   +35 more
core   +1 more source

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

Journal of Field Robotics, EarlyView.
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

A two-step method to detect broadcast ephemeris unavailable periods caused by BeiDou satellite orbital maneuvers

Geodesy and Geodynamics, 2023
The space constellation of the BeiDou navigation satellite system (BDS) is a hybrid constellation containing medium earth orbit (MEO) satellites, geostationary earth orbit (GEO) satellites, and inclined geosynchronous orbit (IGSO) satellites.
Jingjing Wang, Chao Zhou, Zhixuan Sun
doaj   +1 more source

Detecting Plateau Zokor (Eospalax baileyi) Mounds in UAV Imagery of Alpine Meadows Using Deep Learning Algorithms

Remote Sensing in Ecology and Conservation, EarlyView.
We developed PZM‐YOLO to automatically detect plateau zokor mounds in UAV imagery of alpine meadows. The model achieved reliable detection of small and densely distributed mounds under complex backgrounds, outperforming the baseline YOLOv5s. This framework supports mound counting, mound position, rodent impact assessment, and grassland restoration ...
Yang Yang, Limin Hua, Lianguo Wang, Jiazhen Li, Rui Dong, Siwei Yang   +5 more
wiley   +1 more source

Investigation of the accuracy of BeiDou, QZSS and QZSS/BeiDou satellites configuration for short, medium and long baselines in the Asia-Pacific regions

Reports on Geodesy and Geoinformatics
The field of satellite navigation has seen significant advancements due to the fast development of multi-constellation Global Navigation Satellite Systems (GNSS).
Pirti Atinç
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, EarlyView.
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

Precise orbit determination and point positioning using GPS, Glonass, Galileo and BeiDou

Journal of Geodetic Science, 2014
State of the art Precise Point Positioning (PPP) is currently based on dual-frequency processing of GPS and Glonass navigation systems. The International GNSS Service (IGS) is routinely providing the most accurate orbit and clock products for these ...
Tegedor J., Øvstedal O., Vigen E.
doaj   +1 more source

LSOS: An FG Position Method Based on Group Phase Ranging Ambiguity Estimation of BeiDou Pseudolite

Remote Sensing, 2023
Due to the influence of indoor space environments, the carrier phase information obtained by the BeiDou pseudo-satellite often has the issue of cycle slips, which makes the user unable to carry out high-precision positioning.
Heng Zhang, Shuguo Pan
doaj   +1 more source