Results 1 to 10 of about 2,749,924 (279)

A Vessel Position Precision Analysis Based on a Two-Star Combined Approach

Journal of Marine Science and Engineering
Traditional celestial navigation mainly utilized the sextant to measure the attitude and the position contour method to calculate and resolve the vessel’s positioning problem, but these methods are not rigorous, having major deficiencies in the ...
Yulin Wu, Chao Zhuo, Tao He, Gangjun Liu, Qingqing Liu   +4 more
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The Positioning Technology for Underwater Wireless Optical Communication Systems

Guangtongxin yanjiu, 2023
In recent years, with the continuous promotion of the " Ocean Power" strategy, Underwater Wireless Optical Communication (UWOC) has played an important role in marine military, underwater environment monitoring, submarine oil exploration and marine ...
ZHANG Teng-xiao, QIU Yang
doaj  

Positioning performance analysis on combined GPS/BDS precise point positioning

Geodesy and Geodynamics, 2020
Combining the observation data from five Multi-GNSS Experiment (MGEX) stations with the precise orbit and clock products from Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS), we studied the model of combined GPS/BDS precise ...
Jing Xiong, Fei Han
doaj   +1 more source

Ultrasonic Array-Based Multi-Source Fusion Indoor Positioning Technology

Sensors
Underground mining involves numerous risks, such as collapses, gas leaks, and explosions, posing significant threats to worker safety. In this work, we develop an indoor localization system that uses Bluetooth for coarse positioning and ultrasonic arrays
Cong Li, Chenning Zhang, Bing Chen, Shaojian Xu, Luping Xu, Bo Yan   +5 more
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Polish DGPS System: 1995–2017 – Study of Positioning Accuracy

Polish Maritime Research, 2019
This paper is the fourth in a series of publications presenting the process of installation, testing and long-term assessment of the navigational parameters of the Polish DGPS system. This series of publications intends to present – to the general public
Specht Cezary, Smolarek Leszek, Pawelski Jan, Specht Mariusz, Dąbrowski Paweł   +4 more
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Three Dimensional Evaluation of Accuracy of Bracket Positioning

Journal of Pharmacy and Bioallied Sciences, 2023
ABSTRACT Introduction: The success of orthodontic treatment depends on accurate bracket placement, so researchers are constantly exploring new direct and indirect bonding methods with the help of cutting-edge imaging technologies like cone beam computed tomography (CBCT), which provides full ...
Kapil Kamal Kishor Fafat, Deepali Jain, Susmita Kumari Pandit, Rythm Kharbanda, Pragya Trivedy, Ekta Gupta   +5 more
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Assessing the Performance of Precise Point Positioning (PPP) with the Fully Serviceable Multi-GNSS Constellations: GPS, BDS-3, and Galileo

Remote Sensing, 2023
Nowadays, both BDS-3 and Galileo can provide global positioning and navigation services. This contribution carried out a comprehensive analysis and validation of positioning performance in terms of positioning accuracy (RMS) and convergence time, which ...
Zunyao Hou, Feng Zhou
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Single-epoch power positioning method for multi-beam LEO communication satellites

Frontiers in Physics
Low Earth Orbit (LEO) communication satellites offer reduced signal loss, fast movement, multi-beam, typically providing single coverage. This paper introduces a novel multi-beam power positioning method for low-orbit single-satellite, addressing the ...
Sibo Gao, Sibo Gao, Chunjiang Ma, Chunjiang Ma, Xiaomei Tang, Xiaomei Tang, Feixue Wang, Feixue Wang   +7 more
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Improvement of the Positioning Accuracy of a Single Frequency Receiver using Observables of the Dual GPS Reference Stations [PDF]

Journal of Astronomy and Space Sciences, 2008
With the growth of civil and commercial applications, the Global Navigation Satellite System(GNSS) that provides the positioning, navigation, and timing information affects to our life.
Byung-Kyu Choi, Jong-Uk Park, Sang-Jeong Lee   +2 more
doaj   +1 more source

Indoor Pedestrian Positioning Method Based on Ultra-Wideband with a Graph Convolutional Network and Visual Fusion

Sensors
To address the challenges of low accuracy in indoor positioning caused by factors such as signal interference and visual distortions, this paper proposes a novel method that integrates ultra-wideband (UWB) technology with visual positioning.
Huizhen Mu, Chao Yu, Shuna Jiang, Yujing Luo, Kun Zhao, Wen Chen   +5 more
doaj   +1 more source