Results 51 to 60 of about 251 (164)

Multi-Layer LEO Constellation Optimization for GLONASS Augmentation: Geometric Complementarity and Rapid PPP Convergence

Applied Sciences
The GLONASS constellation suffers from inherent geometric weaknesses in mid–low latitude regions, where uneven satellite elevation distribution leads to degraded PDOP and limits high-precision positioning performance.
Hao Xu, Ming Ma, Ronghua Zhang, Yingang Liu   +3 more
doaj   +1 more source

Adaptable Meta-Signal Tracking for Next-Generation Satellite Navigation Systems and LEO PNT

IEEE Access
In this study, the concept of multichannel signal tracking, previously discussed in the Global Navigation Satellite System literature, is expanded towards next-generation satellite navigation paradigms by leveraging multiple narrowband signals that are ...
Andrea Nardin, Fabio Dovis, Francesca Zanier, Floor Melman   +3 more
doaj   +1 more source

Real-Time LEO Satellite Clocks Based on Near-Real-Time Clock Determination with Ultra-Short-Term Prediction

Remote Sensing
The utilization of Low Earth Orbit (LEO) satellites is anticipated to augment various aspects of traditional GNSS-based Positioning, Navigation, and Timing (PNT) services. While the LEO satellite orbital products can nowadays be produced with rather high
Meifang Wu, Kan Wang, Jinqian Wang, Jiawei Liu, Beixi Chen, Wei Xie, Zhe Zhang, Xuhai Yang   +7 more
doaj   +1 more source

A Comparative study on ranging accuracy and interference robustness of LEO-PNT systems in urban and rural scenarios

Satellite Navigation
While Global Navigation Satellite Systems (GNSS) have been the primary Positioning, Navigation, and Timing (PNT) solution since their advent, new technologies are being sought to address the limitations of GNSS.
Guillem Foreman-Campins, José A. López-Salcedo, Elena Simona Lohan   +2 more
doaj   +1 more source

Impact of Latency and Continuity of GNSS Products on Filter-Based Real-Time LEO Satellite Clock Determination

Remote Sensing
High-precision Low Earth Orbit (LEO) satellite clocks are essential for LEO-augmented Positioning, Navigation, and Timing (PNT) services. Nowadays, high-precision LEO satellite clocks can be determined in real-time using a Kalman filter either onboard or
Meifang Wu, Kan Wang, Jinqian Wang, Wei Xie, Jiawei Liu, Beixi Chen, Yulong Ge, Ahmed El-Mowafy, Xuhai Yang   +8 more
doaj   +1 more source

Delay–Doppler Block Division Multiplexing: An Integrated Navigation and Communication Waveform for LEO PNT

Remote Sensing
The recent rapid deployment of low-Earth-orbit (LEO) broadband constellations has positioned these systems as expected emerging navigation sources, thereby driving research interest in integrated navigation and communication (INAC) technologies. Existing
Dong Fu, Honglei Lin, Yinan Meng, Jing Peng, Gang Ou, Shaojing Wang   +5 more
doaj   +1 more source

Optimizing the Deployment of Ground Tracking Stations for Low Earth Orbit Satellite Constellations Based on Evolutionary Algorithms

Remote Sensing
Low Earth orbit (LEO) satellite constellations have emerged as an effective alternative for the provision of high-accuracy positioning, navigation and timing (PNT) solutions which are based on high-precision orbit and clock information.
Mansour Kralfallah, Falin Wu, Afnan Tahir, Amel Oubara, Xiaohong Sui   +4 more
doaj   +1 more source

Low earth orbit satellite positioning: exploration and prospects

物联网学报
Global navigation satellite systems (GNSS) can provide all-day positioning, navigation, and timing (PNT) services in our daily life. However, the requirement of location is not limited to daily life.
LIU Xiangyu, LI Dongbo, LIU Jie
doaj   +2 more sources

Pulsed Orthogonal Time Frequency Space: A Fast Acquisition and High-Precision Measurement Signal for Low Earth Orbit Position, Navigation, and Timing

Remote Sensing
The recent rapid development of low Earth orbit (LEO) constellation-based navigation techniques has enhanced the ability of position, navigation, and timing (PNT) services in deep attenuation and interference environments.
Dong Fu, Honglei Lin, Ming Ma, Muzi Yuan, Gang Ou   +4 more
doaj   +1 more source

Joint Communication and Navigation From LEO Multi-Beam Satellite

IEEE Open Journal of the Communications Society
This paper investigates an innovative approach to enable Joint Communication and Positioning (JCAP) in 5G Non-Terrestrial Networks (NTN) using Low Earth Orbit (LEO) multi-beam satellite systems. The integration of communication and navigation services is
Alejandro Gonzalez-Garrido, Jorge Querol, Henk Wymeersch, Symeon Chatzinotas   +3 more
doaj   +1 more source