2025-10-07 ノルウェー科学技術大学 (NTNU)
Strong GPS signals are required to navigate with electronic maps while driving in the city. For driverless cars, this is especially important. Now, researchers have figured out how to make GPS accurate to the decimeter. Photo: Anne Sliper Midling
＜関連情報＞
- https://norwegianscitechnews.com/2025/10/making-regular-gps-ultra-precise/
- https://www.tandfonline.com/doi/full/10.1080/14498596.2025.2536567
都市環境における位相のみの測位：量販GNSS受信機への可能性の評価 Phase-Only positioning in urban environments: assessing its potential for mass-market GNSS receivers
Ardeshir Mohamadi,Hossein Nahavandchi & Amir Khodabandeh
Journal of Spatial Science Published:25 Jul 2025
DOI:https://doi.org/10.1080/14498596.2025.2536567
ABSTRACT
Recent GNSS advances have greatly improved the performance of compact, low-power, and cost-effective receivers, enabling centimeter-level accuracy through RTK positioning. However, code-multipath still challenges carrier-phase ambiguity resolution in urban environments. To mitigate this issue, Phase-Only Positioning has emerged as an alternative, utilizing carrier phase measurements across multiple-epochs to reduce code-multipath and achieve centimeter-level accuracy. Traditionally, its use has been limited to open-sky conditions or high-end receivers. This paper investigates Phase-Only Positioning in urban settings, specifically in Standard-Interference Urban Canyons (SIUC) and High-Interference Urban Canyons (HIUC), using both mass-market and high-end GNSS receivers. The case study demonstrates that Phase-Only Positioning enables mass-market receivers to achieve centimeter-level accuracy in various urban scenarios. Results show 100% fixed position availability in SIUC environments. In HIUC scenarios – where RTK provides only 3% fixed position availability for both receiver types – the Phase-Only method improves performance, increasing fixed solution availability to 78% for high-end and 58% for low-cost receivers.
