User Range Error Corrections with Latency from PPP Ground-Based Integrity Monitor System

Yu-Fang Lai, Juan Blanch, Todd Walter

Abstract:	Precise Point Positioning (PPP) is a positioning technique that can achieve decimeter level of accuracy for kinematic users and centimeter level for static users with only GNSS measurements. The extremely precise positioning results rely on the provision of the precise corrections from the service provider of PPP. In particular, the precise satellite clock bias and precise ephemeris, which are shown that can be monitored by an Integrity Monitor System (IMS) consists of a group of ground-based receiver network Lai et al. (2024a). The User Range Errors (UREs) and their error bounds (standard deviations) are directly estimated in IMS by a fault-tolerant filter, forming the integrity information that can protect the integrity of the users. In this work, we evaluate the effectiveness of such integrity information for PPP users that are receiving it from the IMS with latencies. We propose a method of prediction model based on Gaussian Process (GP) that can account for the latency of the integrity information. It is verified that the integrity information can protect the PPP users against various threats under different scenarios depending on the amount of latency presented to the users.
Published in:	Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025) September 8 - 12, 2025 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	178 - 191
Cite this article:	Lai, Yu-Fang, Blanch, Juan, Walter, Todd, "User Range Error Corrections with Latency from PPP Ground-Based Integrity Monitor System," Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, Maryland, September 2025, pp. 178-191. https://doi.org/10.33012/2025.20267
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