Satellite Navigation

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

In August 2023, Xiaomi launched the Redmi K60 Ultra, the first multi-frequency smartphone with integrated A-GNSS PPP-B2b services, leveraging the synergy between 5G and GNSS under the 3GPP LPP and OMA SUPL protocols. This study evaluates its performance across multiple metrics including observation noise, TTFF, 5G OTDOA, A-GNSS PPP, and 3DMA PPP positioning. The findings reveal that the Redmi K60 Ultra sets a benchmark in GNSS noise control for the mainstream market, with A-GNSS services reducing cold start positioning time to under 5 s, achieving over 85% efficiency improvement. A-GNSS PPP positioning accuracy surpasses 2 m in most scenarios and 1.5 m under open skies, suitable for lane-level navigation. Additionally, 3DMA PPP significantly enhances positioning in urban canyons, improving accuracy by over 30% compared to standalone PPP. Future enhancements for the A-GNSS platform include 3D city models, precise atmospheric corrections, integrity enhancements, and LEOs.

Check our newest content on the following topics:

• BDS/GNSS: New Development, Progress and Applications 
  This special issue is open to all scientists who may have the latest results and developments in BDS/GNSS+, including constellation, signal, orbit, receiver and new scientific applications. 
• GNSS PPP and PPP-RTK
  This special issue is mainly for the new theory, method and application in real-time PPP and PPP-RTK.
• GNSS Applications in Geosciences
  This special issue invites papers that cover ongoing efforts to broaden the GNSS applications to all possible fields relevant to geosciences, especially in natural hazard monitoring. 
• Ubiquitous Positioning, Navigation and Timing for Location Based Services 
  The aim of this special issue is to collect the new theory, method and application for the ubiquity of PNT in GNSS challenging environments.  
• Navigation Technologies for Autonomous Systems
  This special issue accepts contributions covering advanced topics related to the state of the art and future trends of navigation technologies and algorithms for safe navigation of autonomous systems. 
• GNSS Ionospheric Monitoring and Modelling 
  This special issue is mainly for the new theory, method and application in real-time GNSS monitoring and modeling.
• Ubiquitous Positioning, Indoor Navigation and Location-Based Services
  At UPINLBS, we concentrate on innovative, state-of-the-art solutions and techniques dealing with ubiquitous positioning, indoor navigation, location-based technologies, and so much more! UPINLBS will feature leading minds from relevant industries, and provide an indispensable platform for networking with like-minded individuals, researchers, developers, and businesses.
• BDS/GNSS high-precision products: strategies, services, and applications 
  This special issue is an assemblage of research aiming to cover the strategies used for high-precision products of BDS/GNSS constellations and its applications in geosciences as well as mass massive market. 

Following the rapid economic growth in China over the last 30 years, there is now a strong desire to promote the development and propagation of science and technology for the long-term future. Recognizing the importance of academic journals in disseminating research results and inspiring new research ideas as well as strengthening communication, AIRCAS will sponsor Satellite Navigation as an international platform, providing researchers and engineers in navigation, positioning and timing with a unique opportunity to closely interact and communicate. This journal will not only provide a venue for in-depth scientific exchanges, but also seek to promote research collaborations and exploit international funding sources, especially those involving China. See full text. 

Yuanxi Yang serves as Academician of the Chinese Academy of Sciences for his lifelong contributions to navigation, geodetic science and engineering. Currently, he is Professor of Geodesy and Navigation at Xi’an Research Institute of Surveying and Mapping and serves at China National Administration of GNSS and Application (CNAGA). He is also Head of State Key Laboratory Of Geo-information Engineering, adjunct professor and PhD Tutor in Beihang University.
He acted as deputy chief designer of China’s BeiDou Navigation Satellite System (BDS), and has been a leading member of BDS advisory board since its inception in 2010. He originally developed the Robust Parameter Estimation for Geodetic Correlated Observations and adaptive navigation and kinematic positioning. He is credited with improving the design of the interlink between BeiDou satellites, the establishment of the Chinese Geodetic Coordinate System, the creation of the Chinese National GPS Control Network, and is a prominent proponent of interoperability between BeiDou and other GNSSs.
" The continuous development of global and regional satellite navigation systems provides an important basis for the integrated applications of multi-satellite navigation. The Journal aims to disseminate the latest achievements of satellite navigation, discuss different academic views and promote the progress of technology and applications. I hope Satellite Navigation will build an academic exchange platform for all researchers." Said Prof. Yuanxi Yang.