3 papers
eess.SP2026
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…
eess.SY2025
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…
eess.SP2022
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…