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by Zhetao Zhang (Guest Editor), Guorui Xiao (Guest Editor), Zhixi Nie (Guest Editor)
This reprint mainly focuses on the latest challenges in PNT, especially in challenging environments for various research investigations and a range of practical applications. Topics cover high-precision and high-reliability PNT with GNSS or multi-source sensors, resilient PNT with GNSS or multi-source sensors in challenging environments, integrated PNT with GNSS and multi-sensor systems, and applications of PNT with GNSS or multi-source sensors.