摘要
针对BDS/GPS载波相位定位的病态性问题,该文提出了采用条件数法对比分析BDS/GPS在我国不同地区、不同时段载波相位定位病态性及其在8个地面站的定位精度因子PDOP值变化情况,其中PDOP值能够反映单点定位的病态性。研究结果表明:BDS在我国大部分地区可用性良好,且其平均PDOP值随纬度的增大而线性增加;然而,BDS导航定位的病态性程度比GPS更为严重,BDS载波相位定位病态性程度不仅随观测时长变化,还与所处的位置变化有关,而GPS几乎不受观测地点的影响。研究成果可在BDS/GPS模糊度的快速、准确固定方面提供参考。
Aiming at the problem of the ill-posedness in BDS/GPS carrier phase positioning, this paper presented the condition-number method to compare and analyze the ill-posedness of BDS/GPS carrier phase positioning in different regions of China at different time periods, and the positioning accuracy factor PDOP value changes of BDS/GPS at the eight ground stations. PDOP value can reflect the ill-posedness of the single point positioning. The study results indicated that BDS would have good availability in the most parts of China, and the average PDOP value in regions of China would increase linearly with latitude in- creasing; however, the ill-posedness of BDS could be more serious than that of GPS, because the ill-pos- edness of BDS carrier phase positioning would change not only with the length variation of observation time, but also with the difference of location, whereas, that of GPS would De hardly impacted by the transformation of observation location. The study result would provide a reference for BDS/GPS ambiguity fixing quickly and accurately.
出处
《测绘科学》
CSCD
北大核心
2015年第7期24-28,共5页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41321063)
大地测量与地球动力学国家重点实验室基金项目(SKLGED2013-4-1-Z)
