关键词: 南极, 多模多频, BDS-3, 兼容频率, PPP

Abstract: [Purposes]To address the issue of the lack of long-term continuous positioning performance evaluation of China's BDS-3 new frequencies in the Antarctic region.[Methods]This paper uses the dual-frequency ionospheric-free combination model technology.Based on the continuous one year observation data from multiple tracking stations in the Antarctic region,the static and dynamic PPP performance of BDS-3 is evaluated,and a comparative analysis is conducted with the compatible frequencies of other navigation and positioning systems.[Findings]The experimental results show that in the Antarctic region,the satellite constellation status of the compatible frequencies of BDS-3 and Galileo is good and comparable,while that of the GPS satellite constellation is poor.The compatible frequencies of BDS-3 and Galileo can achieve stable and reliable PPP positioning,with the positioning accuracy reaching about 1 cm per epoch.However,the PPP accuracy of the GPS system is poor,and it cannot achieve stable and continuous positioning.The satellite constellation status and PPP accuracy of the BDS+Galileo+GPS combined constellation are significantly improved compared with any single system,and the positioning accuracy can reach the millimeter level at most.[Conclusions]The new frequencies of BDS-3 have the ability to provide high precision and high reliability positioning services in the Antarctic region,and the combined application of multiple systems is an effective way to improve the navigation and positioning performance in the polar regions.

Key words: Antarctica, multi-mode multi-frequency, BDS-3, compatible frequency, PPP