Can the low earth orbit enhanced GNSS (LeGNSS) achieve the expected Precise Point Positioning (PPP) solutions in urban canyons? 

 Yanning Zheng, Bofeng Li and Haibo Ge

ABSTRACT 

 Low Earth Orbit (LEO) satellites are expected to improve Global Navigation Satellite System (GNSS) Precise Point Positioning (PPP) by providing rapid geometric variations. While centimeter-level PPP accu racy has been achieved in open-sky conditions, the effectiveness of LEO-enhanced GNSS (LeGNSS) in urban canyons, where signal block age is frequent, remains uncertain. This paper investigates LeGNSS PPP performance in such environments, focusing on the impact of inter rupted-phase observations. Results show that signal blockage signifi cantly affects accuracy, while repairing interruptions improves precision. However, in dense urban areas or at higher speeds, this repair process becomes challenging, limiting performance.