极地地区北斗三号单点定位精度分析

为分析BDS-3在极地地区的定位精度，选取两极地区10个MGEX站连续7 d的观测数据进行SPP和PPP实验。结果表明，BDS-3在两极地区可见卫星数及PDOP基本一致，平均可见卫星数约为9颗，PDOP约为2.3。BDS-3各频点间定位精度相差不大，南极地区SPP定位精度略优于北极，特别是U方向。北极地区E、N、U方向定位精度分别优于1 m、1 m和5 m，南极地区E、N、U方向定位精度分别优于1 m、1 m和2 m。BDS-3在两极地区PPP定位精度相当，与GPS定位精度基本一致，各频点组合定位精度在E、N、U方向均优于2 cm。

Analysis of Single Point Positioning Accuracy of BDS-3 in Polar Regions

To analyze the positioning accuracy of BDS-3 in polar regions, 7 consecutive days of observation data from 10 MGEX stations are selected for SPP and PPP experiments. The results show that the number of visible satellites of BDS-3 in Arctic and Antarctic regions is similar, which have an average of 9 visible satellites, and the value of PDOP is same, which is about 2.3. The positioning accuracy of BDS-3 is analogous among different frequency points. The positioning accuracy of SPP in Antarctic region is slightly better than that of Arctic region, especially in the U direction. The positioning accuracy is better than 1 m, 1 m, and 5 m in the E, N, and U directions in Arctic region, respectively, and better than 1 m, 1 m, and 2 m in the E, N, and U directions in Antarctic region, respectively. BDS-3 has the same PPP positioning accuracy in polar regions, which is basically consistent with GPS. The positioning accuracy is better than 2 cm in the E, N, and U directions of each combined frequency point.