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Furuno Electric Co., Ltd. (headquartered in Nishinomiya, Japan) conducted the following session lecture at ION GNSS+ 2025 held in Baltimore, USA, from 8 to 12 September 2025.

Session Lecture

• Title : Tight Integration of GNSS/LEO/INS in Dense Urban Environments
• Presenter : Yoji Takayama
• Schedule : September 11, 2025
• Summary :
  This study presented a promising solution to the problem of inaccuracy in dense urban environments, where many satellite signals can be obstructed by buildings and walls. Although the emergence of LEO PNT technologies presents a significant opportunity to demonstrate extremely accurate positioning, dense urban environments remain challenging due to the limited sky view caused by numerous skyscrapers. We propose a tightly coupled integration of GNSS, LEO, and INS to overcome the signal obstructions. Through numerical simulations, we will demonstrate that our integration algorithm can achieve horizontal positioning accuracy of approximately 0.5 meters. It is also worth noting that the LEO constellation used in this study is representative of the Xona Pulsar system, a dedicated commercial LEO PNT system. Given that future mobility solutions—including autonomous robots, vehicles, and drones—are advancing towards automation, connectivity, and AI-driven systems, this technology based on Pulsar is expected to serve as a cornerstone in ensuring accuracy and reliability, even in scenarios with limited satellite visibility.