Publications by authors named "Akram Afifi"

This paper introduces a new dual-frequency precise point positioning (PPP) model, which combines the observations from three different global navigation satellite system (GNSS) constellations, namely GPS, Galileo, and BeiDou. Combining measurements from different GNSS systems introduces additional biases, including inter-system bias and hardware delays, which require rigorous modelling. Our model is based on the un-differenced and between-satellite single-difference (BSSD) linear combinations.

View Article and Find Full Text PDF
Article Synopsis
  • The paper analyzes different precise point positioning (PPP) models using dual-frequency GPS and Galileo data to enhance performance.
  • The study reveals that various models, particularly the semi-decoupled and between-satellite single-difference (BSSD) models, significantly improve convergence time and solution precision compared to traditional GPS-only models.
  • Results indicate that the BSSD PPP model offers the best performance, enhancing convergence time by about 50% and solution precision by up to 50% when specific combinations of satellite data are used.
View Article and Find Full Text PDF