Results 41 to 50 of about 169 (129)

A GIVE Prediction Method in SBAS Based on GAT‐TCN

Space Weather, Volume 23, Issue 11, November 2025.
Abstract A Grid Ionospheric Vertical Error (GIVE) prediction model based on GAT‐TCN is proposed in this paper. The model integrates the Graph Attention Network (GAT) with the Temporal Convolutional Network to enhance prediction accuracy while ensuring the integrity of the Satellite‐Based Augmentation System, thereby improving its availability.
Hao Zhang, Yingkui Gong, Fei Zhao, Yuanhang Liu, Cheng Yu, Ziyue Hu, Yubo Zhu, Guang Yang, Hong Yuan   +8 more
wiley   +1 more source

Research on the Autonomous Orbit Determination of Beidou-3 Assisted by Satellite Laser Ranging Technology

Remote Sensing
The Beidou Global System (BDS-3) innovatively achieves autonomous navigation using inter-satellite links (ISL) across the entire constellation, but it still faces challenges such as the limitations of the prior constraint orbital accuracy and the overall
Wei Xiao, Zhengcheng Wu, Zongnan Li, Lei Fan, Shiwei Guo, Yilun Chen   +5 more
doaj   +1 more source

Ionospheric Disturbances During the 4 December 2015, Mt. Etna Eruption

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract This study presents the detection and characterization of co‐volcanic ionospheric disturbances (CVIDs) associated with Mt. Etna's large‐scale lava fountain (Italy). Leveraging a dense and proximal GNSS network, we identify local Total Electron Content (TEC) perturbations extending up to ∼ ${\sim} $200 km south/southwest of the vent.
F. Ferrara, M. Ravanelli, A. Bonforte, V. Capparelli, V. Carbone, S. Scollo, L. Mereu, A. Cannata   +7 more
wiley   +1 more source

Real‐Time Regional Ionosphere Modeling With RFR‐Net Over China

Space Weather, Volume 23, Issue 8, August 2025.
Abstract The mid‐to‐low‐latitude ionosphere, influenced by phenomena such as the Equatorial Ionization Anomaly, responds more sensitively to changes in solar activity, which negatively affect the transmission of various electromagnetic signals. Moreover, next‐generation technologies, particularly Precise Point Positioning‐Real‐Time Kinematic (PPP‐RTK),
Mengfei Sun, Tong Liu, Zonghua Ding, Jian Liu, Yanshi Huang, Kun Zhang, Shengliang Fang, Shizhong Li, Qinglei Kong, Bo Chen   +9 more
wiley   +1 more source

The Benefit of Space Clocks for the Deep Space Network

Radio Science, Volume 60, Issue 8, August 2025.
Abstract Ground‐based atomic clocks have been the foundation of the Deep Space Network's (DSN's) ability to provide high‐precision tracking to deep space users for navigation and radio science since its inception in the mid‐1960s. This paper describes the development of space clocks that could aid the DSN and the solar system exploration enterprise ...
T. Ely, E. Burt, K. Cheung, R. Tjoelker
wiley   +1 more source

The Quality Assessment of Non-Integer-Hour Data in GPS Broadcast Ephemerides and Its Impact on the Accuracy of Real-Time Kinematic Positioning Over the South China Sea

Computer Modeling in Engineering & Sciences, 2019
Abnormal effects in GPS broadcast ephemerides can have a significant effect on real-time navigation and positioning solutions that use the orbit and clock error data provided by GPS broadcast ephemerides. This paper describes three types of non-integer-hour navigation data in GPS broadcast ephemeris data.
Zhangzhen Sun, Tianhe Xu, Fan Gao, Chunhua Jiang, Guochang Xu   +4 more
openaire   +1 more source

Performance Evaluation of the Dual‐Frequency Ionospheric Free Combination on BDS‐3 Single Point Positioning Accuracy

Engineering Reports, Volume 7, Issue 7, July 2025.
Some stations have slightly larger errors in mid low latitude regions, while others have slightly smaller errors in high latitude regions. By comparing the B1C/B2a and B2b/B3I IFC SPP results of all 84 stations, it was found that the RMSE of all stations with B2b/B3I IFC was greater than that of B1C/B2a. ABSTRACT This article analyzes the BDS Phase III
Xingli Sun, Jinjie Yao
wiley   +1 more source

Integrated precise orbit determination for LEO constellation and BDS-3 MEO satellites using inter-satellite links and onboard BDS-3 observations

Satellite Navigation
By leveraging the high-precision spatial reference established with Global Navigation Satellite System (GNSS), we propose a low-ground-dependency and low-latency Precise Orbit Determination (POD) method employing onboard GNSS, Inter-Satellite Link (ISL ...
Geer Qin, Kecai Jiang, Min Li, Qile Zhao, Xin Xie, Youcun Wang, Chao Yang, Yubin Wang, Chuntao Chang   +8 more
doaj   +1 more source

Ionospheric Scintillation Activity Over Canada in 2019–2023 and Its Potential Influence on Wide Area Augmentation System (WAAS) Navigation Services for Aviation

Space Weather, Volume 23, Issue 7, July 2025.
Abstract Ionospheric scintillation caused by space weather impacts the accuracy and availability of GNSS services and is considered a natural hazard for aviation and other GNSS users. Increased solar activity in 2021–2023, attributed to the ascending phase of the 25th solar cycle, caused an amplification of ionospheric disturbances including the ...
L. Nikitina, R. A. D. Fiori, K. Sievers, A. Rynard, Q. Ciardelli   +4 more
wiley   +1 more source

Laser Terminals on CubeSats: Developments for Telecommunications and Quantum Links

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 133-146, May/June 2025.
ABSTRACT Satellite‐based laser communication is an emerging technology that is finding its way from research to industry. Compared to radio frequency (RF) systems, it has a more efficient size, weight, and power budget and, furthermore, is license free.
Christian Roubal, Till Dolejsky, Benjamin Rödiger, Fabian Rein, Jorge Rosano Nonay, René Rüddenklau, Christos Papadopoulos, Christopher Schmidt, Florian Moll   +8 more
wiley   +1 more source