Abstract: Using the BeiDou/GPS dual-system four-frequency receiver, BeiDou and GPS data were collected from Tianjin in China to Kunlun Station in Antarctica, along the route of the 28th Chinese National Antarctic Research Expedition. Based on the signal-to-noise ratio and multipath of the C/A code (Coarse/Acquisition code), visible satellites, PDOP (Position Dilution of Precision), and single-frequency point positioning using the C/A code, the navigational and positioning features of BeiDou and GPS were analyzed during different parts of the voyage, especially in the ocean and Antarctic regions, under different movement modes. Results showed that the signal quality of BeiDou is generally as good as that of GPS. At 45°, the precision of BeiDou kinematic positioning is consistent with GPS, i.e., 10 and 20 m in the horizontal and vertical directions, respectively. The precision of static positioning reaches several meters in the horizontal direction, which is comparable with GPS, and about 10 m in the vertical direction, which is worse than GPS. In mid- and high latitudes, because of the lack of visible satellites, positioning accuracy is poor and even positioning failed.

Key words: BeiDou Navigation Satellite System, signal quality, positioning analysis, standard positioning, Antarctic region