Ground-Based Integrity Monitors for PPP Correction Services

Yu-Fang Lai, Juan Blanch, and Todd Walter

Peer Reviewed

Abstract: Integrity of Precise Point Positioning (PPP) is important for users with safety critical requirements, such as autonomous vehicles, that require sub-centimeter or centimeter level of positioning accuracy. It is therefore important for the provider of PPP network to guarantee the integrity of the broadcast corrections and the service itself is intact, and the network itself if capable of identifying and excluding the faulted satellite. For the integrity monitor system, we formulated an all-in-view centralized PPP filter dedicated to protecting the PPP user integrity in addition to the correction information necessary for the operation of PPP service. In this paper, we establish and simulate the operation of integrity monitor for PPP service. Specifically, we evaluate the satellite clock fault that happened on July 10th, 2023, and inject artificial satellite clock faults. The result shows we can correctly estimate the relative range errors in multi-fault scenarios with a constant bias, and the absolute user range errors after removing the bias. In summary, the all-in-view centralized filter can monitor all the satellites in-view to the receivers without applying solution separation on the satellites.
Published in: Proceedings of the ION 2024 Pacific PNT Meeting
April 15 - 18, 2024
Hilton Waikiki Beach
Honolulu, Hawaii
Pages: 514 - 526
Cite this article: Lai, Yu-Fang, Blanch, Juan, Walter, Todd, "Ground-Based Integrity Monitors for PPP Correction Services," Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024, pp. 514-526.
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