中高纬度地区GPS/GLONASS/BDS-3组合精密相对定位性能评估
Performance Evaluation of the Combined GPS/GLONASS/BDS-3 Precision Relative Positioning in Middle and High Latitudes

目前，短基线定位的研究大都基于低纬度和中纬度地区，并且基于GPS、Galileo和BDS的研究占极大比例，由于GLONASS模糊度的特殊性，涉及中高纬度地区关于GLONASS的短基线定位研究较少。为了研究中高纬度地区GPS/GLONASS/BDS-3的定位效果，通过对GLONASS的模糊度进行重组的方法并设置不同高度角模拟不同遮挡情况下对单系统以及不同组合系统的模糊度固定率、模糊度成功率、可视卫星数以及定位精度等方面进行对比分析。结果显示，在15？截止高度角下进行单频单历元基线解算模糊度固定率处于最为理想状态达到95%以上，模糊度成功率达到90%以上。总体上，在中高纬度地区，GPS/ GLONASS/BDS-3组合定位精度可达到cm级。
At present, most of the research on short-baseline positioning is based on low-latitude and mid-latitude regions, and the research based on GPS, Galileo and BDS accounts for a large propor-tion. Due to the particularity of GLONASS ambiguity, there are few short-baseline positioning re-searches on GLONASS in mid-latitude and high-latitude regions. In order to study the positioning effect of GPS/GLONASS/BDS-3 in middle and high latitudes, through the method of reorganizing the ambiguity of GLONASS and setting different altitude angles to simulate different occlusion situa-tions, the ambiguity fixation rate, ambiguity success rate, number of visible satellites, and position-ing accuracy of a single system and different combined systems are compared and analyzed. The results show that the ambiguity fixation rate of the single-frequency single-epoch baseline solution is in the most ideal state, reaching more than 95%, and the ambiguity success rate reaches more than 90%. In general, in the middle and high latitudes, the combined positioning accuracy of GPS/GLONASS/BDS-3 can reach cm-level.