Multi-frequency smartphone positioning performance evaluation: insights into A-GNSS PPP-B2b services and beyond

作者：Jiale Wang, Chuang Shi, Fu Zheng, Cheng Yang, Xu Liu, Shuo Liu, Ming Xia, Guifei Jing, Tuan Li, Wu Chen, Qingcheng Li, Yong Hu, Yuan Tian, Yunfeng Shan · 发表于：Satellite Navigation · 年份：2024 · DOI：10.1186/s43020-024-00146-5 · 被引用次数：83 · 研究领域：GNSS positioning and interference、Indoor and Outdoor Localization Technologies、Radio Wave Propagation Studies

Abstract In August 2023, Xiaomi unveiled the Redmi K60 Ultra, the first multi-frequency smartphone integrated with BeiDou-3 Navigation Satellite System Precise Point Positioning (PPP-B2b) services and employing PPP technology as the primary positioning method. The positioning enhancement service is provided by the Assisted Global Navigation Satellite System (A-GNSS) location platform developed by the China Academy of Information and Communications Technology. The signaling interaction between the server and the users strictly adheres to the Third Generation of Mobile Communications Technology Partnership Project Long-Term Evolution Positioning Protocol and the Open Mobile Alliance Secure User Plane Location framework. To comprehensively evaluate the Redmi K60 Ultra’s capabilities, this study designed six distinct experimental scenarios and conducted comprehensive research on multi-frequency and multi-GNSS observation noise, Time to First Fix (TTFF), as well as the performance of both GNSS-based and network-based positioning. Experimental results indicate that the GNSS chipset within the Redmi K60 Ultra has achieved a leading position in the consumer market concerning supported satellite constellations, frequencies, and observation accuracy, and is comparable to some low-cost GNSS receivers. A-GNSS positioning can reduce the TTFF from 30 to under 5 s, representing an improvement of over 85% in the cold start speed compared to a standalone GNSS mode. The positioning results sho...