北方海区北斗地基增强系统基站自定位精度研究

Experimental research on the accuracy of self-positioning by base station of BDGBAS in the northern sea area

针对原有以全球定位系统(GPS)为主导的北方海区连续运行参考站(CORS)定位数据质量存在一定缺陷,采用精密单点定位(PPP)方式对新建立的北方海区北斗地基增强系统(BDGBAS)中各基站的自定位精度进行实验研究。利用尔特克利布(RTKLIB)软件对7个基站的观测数据进行解算,并对7个基站多系统各波段涉及的可见卫星数、信噪比、多路径误差、定位精度等重要技术参数进行分析,以均方根误差(RMS)为评定指标。实验结果表明:新建的北方海区BDGBAS具有非常重要的意义,各基站自定位的平面精度可达到8 cm,天顶方向精度可达到14 cm,能更有效地满足渤海湾及离黄海岸线300 km以内的多种导航、定位、测量的服务需求。

Aiming at the problem that the data quality of positioning by Continuously Operating Reference Stations(CORS)in the northern sea area based on Global Positioning System(GPS)has some defects,the self-positioning accuracy of each base station in the newly established BeiDou Ground-Based Augmentation System(BDGBA)in the northern sea area is experimentally studied with Precise Point Positioning(PPP).The observation data in 7 base stations is processed by RTKLIB.The important technical parameters such as the number of visible satellites,Signal Noise Ratio(SNR),multipath error,positioning accuracy related to each band of multi-system at each base station are analyzed.By using Root Mean Square Error(RMS)as the evaluation index,the experimental results show that it is of great significance to establish BDGBA in the northern sea area.The horizontal accuracy of self-positioning in each base station can reach 8cm and vertical accuracy 14cm.The service requirements of various navigation,positioning and surveying in Bohai Bay and within 300 km from the Yellow Sea coastline can be meet more effectively.