摘要
为研究甘肃省内北斗导航卫星系统(BDS)精密单点定位(PPP)性能,提出一种单北斗及包含北斗的多系统组合精度分析方法,并分析BDS对地震中连续运行参考站(CORS)位移监测的可行性。基于甘肃省北斗卫星导航定位基准站网实测多频多模观测数据,结合相位偏差改正模型,采用无电离层组合模糊度固定(AR)算法,从定位精度、卫星空间分布及位置精度因子(PDOP)等多方面评估定位结果,利用静态和动态PPP-AR计算临夏积石山地震震中LXJS测站位移变化量。研究结果表明:单北斗BDS-3 (B3)定位精度优于B2/B3和B2,多系统组合GPS/GLONASS/Galileo/BDS-3 (G/R/E/B3)优于G/R/E/B2/B3和G/R/E/B2;多系统组合G/R/E/B3优于单北斗B3,Up方向定位精度至少提升了40%;由于B2受空间卫星分布不均匀、卫星轨道及钟差误差较大等因素影响,单北斗B2/B3和多系统组合G/R/E/B2/B3出现了PDOP值减小而定位精度下降的现象。研究结论为毫米级地震位移监测提供参考。
To researth the performance of the BeiDou navigation satellite system(BDS)precise point positioning(PPP)in Gansu Province,a precision analysis method for single BeiDou and BeiDou-inclusive multi-system combinations is proposed.The feasibility of using BDS to monitor displacement of continuous operating reference stations(CORS)during earthquakes is also analyzed.Based on multi-frequency,multi-mode observation data from the BeiDou satellite navigation reference station network in Gansu Province,and incorporating a phase bias correction model,the ambiguity resolution(AR)algorithm for ionosphere-free combination is applied.The positioning results are evaluated from multiple aspects such as positioning accuracy,satellite spatial distribution,and position dilution of precision(PDOP).Static and dynamic PPP-AR calculations are used to compute the displacement variation at the LXJS station in the epicenter of the Jishishan earthquake in Linxia.The results show that the BDS-3(B3)positioning accuracy for single BeiDou is superior to B2/B3 and B2.The multi-system combination GPS/GLONASS/Galileo/BDS-3(G/R/E/B3)outperforms G/R/E/B2/B3 and G/R/E/B2.The multi-system combination G/R/E/B3 provides better results than single B3,with an improvement of at least 40%in the Up-direction positioning accuracy.Because B2 is affected by factors such as uneven distribution of space satellites,large satellite orbit and clock error,the PDOP value of single Beidou B2/B3 and multi-system combination G/R/E/B2/B3 decreases and the positioning accuracy decreases.The research conclusions provide a reference for millimeter-scale seismic displacement monitoring.
作者
赵亮
杨南南
徐爱功
ZHAO Liang;YANG Nannan;XU Aigong(Beidou Navigation and Positioning Center,Surveying and Mapping Engineering Institute of GanSu,Lanzhou 730000,China;School of Geomatics,Liaoning Technical University,Fuxin 123000,China)
出处
《辽宁工程技术大学学报(自然科学版)》
北大核心
2025年第2期138-145,共8页
Journal of Liaoning Technical University (Natural Science)
基金
甘肃省自然资源厅科技创新项目(202217)。
关键词
北斗导航卫星系统
模糊度固定
多系统组合
无电离层组合
定位精度
BeiDou navigation satellite system(BDS)
ambiguity resolution(AR)
multi-system combination
ionosphere-free combination
positioning accuracy
