非组合精密单点定位模型参数估计  

Parameter estimation of uncombined precision point positioning model

作　　者：陈亮[1] 展昕 赵胜[1] 张志新 CHEN Liang;ZHAN Xin;ZHAO Sheng;ZHANG Zhixin(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China;The 722th Research Institute of China Shipbuilding Industry Corporation,Wuhan 430205,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081 [2]中国船舶重工集团公司第七二二研究所,武汉430205

出　　处：《导航定位学报》2024年第1期115-123,共9页Journal of Navigation and Positioning

摘　　要：为了进一步发挥非组合精密单点定位具有的数据利用率高、未放大观测噪声和可估计电离层延迟等优势,提出一种可估计电离层延迟和接收机差分码偏差(DCB)的改进非组合精密单点定位模型:与传统非组合精密单点定位模型估计的接收机钟差参数和DCB进行组合计算,估计出接收机钟差与参与计算的第一频点和第二频点的硬件延迟;利用北京某监测站采集的北斗三号全球卫星导航系统(BDS-3)观测数据,对B1I+B3I、B1C+B2a等2种频点组合分别进行2种非组合精密单点定位计算,估计电离层延迟、接收机钟差、第一频点和第二频点的硬件延迟。结果表明:传统非组合精密单点定位模型定位精度和收敛时间略优于改进的非组合精密单点定位模型;改进非组合精密单点定位模型估计的电离层延迟的平均修正百分比为85.54%,比传统非组合精密单点定位模型估计的电离层延迟高6.43%;B1I+B3I和与B1C+B2a频点组合估计的接收机钟差的RMS分别为0.19和0.21 ns,均值相差0.09 ns,钟差估计精度相当;接收机B1I、B3I、B1C和B2a硬件延迟与标定值都在0.14 ns以内。In order to further leverage the advantages of high data utilization,unamplified observation noise and estimable ionospheric delay of non combined precision single point positioning,the paper proposed an improved non combined precision single point positioning model that can estimate ionospheric delay and receiver differential code bias(DCB):the model was combined with the traditional non combined precision single point positioning model to estimate the receiver clock bias parameters and DCB,and the receiver clock bias and the hardware delay of the first and second frequency points involved in the calculation were estimated;then using the observation data of BeiDou-3 global navigation satellite system(BDS-3)collected by a monitoring station in Beijing,two types of non combined precision single point positioning calculations were carried out for frequency point combinations of B1I+B3I and B1C+B2a respectively,and the ionospheric delay,receiver clock error and hardware delay of the first and second frequency points were estimate.Results showed that the traditional non combined precision single point positioning model would have slightly better positioning accuracy and convergence time than the improved non combined precision single point positioning model;the average correction percentage of ionospheric delay estimated by the improved non combined precision single point positioning model would be 85.54%,which is 6.43%higher than the ionospheric delay estimated by the traditional non combined precision single point positioning model;moreover,the RMS of receiver clock bias estimated by combining B1I+B3I and B1C+B2a frequency points would be 0.19 and 0.21 ns,respectively,with a mean difference of 0.09 ns,indicating that the accuracy of clock bias estimation could be comparable;at the same time,the hardware delay and calibration values of receivers B1I,B3I,B1C,and B2a would be all within 0.14 ns.

关 键 词：非组合 精密单点定位 接收机钟差 电离层延迟 差分码偏差(DCB) 

分 类 号：P228[天文地球—大地测量学与测量工程]