19 citations · 23 across the 12 of their papers we have counts for
12 papers
Coordination of Ground-to-Space Reference Networks for High-Precision GNSS
Xue Xian Zheng, Xing Liu, José A. López-Salcedo +2
High-precision Global Navigation Satellite System (GNSS) services rely on accurate orbit, clock, atmospheric, and hardware-bias corrections generated from reference observations. T…
LEO Constellations as a Decentralized GNSS Network: Optimizing PNT Corrections in Space
Xing Liu, Xue Xian Zheng, José A. López-Salcedo +2
With the rapid expansion of low Earth orbit (LEO) constellations, thousands of satellites are now in operation, many equipped with onboard GNSS receivers capable of continuous orbi…
GNSS Array-Based Multipath Detection Employing UKF on Manifolds
Abdelgabar Ahmed, Tarig Ballal, Xing Liu +2
Global Navigation Satellite Systems (GNSS) applications are often hindered by various sources of error, with multipath interference being one of the most challenging, particularly…
Decentralized GNSS at Global Scale via Graph-Aware Diffusion Adaptation
Xue Xian Zheng, Xing Liu, Tareq Y. Al-Naffouri
Network-based Global Navigation Satellite Systems (GNSS) underpin critical infrastructure and autonomous systems, yet typically rely on centralized processing hubs that limit scala…
Orbital Errors in LEO Satellite Positioning: Modeling, Analysis, and Bayesian Calibration
Jie Ma, Pinjun Zheng, Xing Liu +3
Low-Earth orbit (LEO) satellites offer a promising alternative to global navigation satellite systems for precise positioning. However, their relatively low altitudes make them mor…
Integrated Positioning and Communication via LEO Satellites: A Contemporary Overview
Jie Ma, Pinjun Zheng, Xing Liu +2
Low Earth orbit (LEO) satellites, as a prominent technology in the sixth generation non-terrestrial network, offer both positioning and communication capabilities. While these two…
LEO- and RIS-Empowered User Tracking: A Riemannian Manifold Approach
Pinjun Zheng, Xing Liu, Tareq Y. Al-Naffouri
Low Earth orbit (LEO) satellites and reconfigurable intelligent surfaces (RISs) have recently drawn significant attention as two transformative technologies, and the synergy betwee…
LEO Satellite and RIS: Two Keys to Seamless Indoor and Outdoor Localization
Pinjun Zheng, Xing Liu, Yuchen Zhang +3
The contemporary landscape of wireless technology underscores the critical role of precise localization services. Traditional global navigation satellite systems (GNSS)-based solut…
Attitude Determination in Urban Canyons: A Synergy between GNSS and 5G Observations
Pinjun Zheng, Xing Liu, Tarig Ballal +1
This paper considers the attitude determination problem based on the global navigation satellite system (GNSS) and fifth-generation (5G) measurement fusion to address the shortcomi…
Beamforming Design and Performance Evaluation for RIS-aided Localization using LEO Satellite Signals
Lei Wang, Pinjun Zheng, Xing Liu +2
The growing availability of low-Earth orbit (LEO) satellites, coupled with the anticipated widespread deployment of reconfigurable intelligent surfaces (RISs), opens up promising p…
5G-Aided RTK Positioning in GNSS-Deprived Environments
Pinjun Zheng, Xing Liu, Tarig Ballal +1
This paper considers the localization problem in a 5G-aided global navigation satellite system (GNSS) based on real-time kinematic (RTK) technique. Specifically, the user's positio…
Instantaneous GNSS Ambiguity Resolution and Attitude Determination via Riemannian Manifold Optimization
Xing Liu, Tarig Ballal, Mohanad Ahmed +1
We present an ambiguity resolution method for Global Navigation Satellite System (GNSS)-based attitude determination. A GNSS attitude model with nonlinear constraints is used to ri…