铁路直线轨道约束的动态精密单点定位  

Kinematic Precise Point Positioning of Railway Linear Trajectory Constraints

作　　者：凌超 LING Chao(China Railway SIYUAN Survey and Design Group Co.,Ltd.,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司勘察院,武汉430063

出　　处：《铁道勘测与设计》2025年第1期13-18,共6页Railway Survey and Design

摘　　要：常规的精密单点定位(Precise Point Positioning,PPP)算法中尚未考虑附加先验信息约束的方法,当系统存在固有的先验信息时,不加以利用可能会导致信息的浪费。对此,本文重点研究了车辆直线运动轨迹所存在的约束信息,推导整理了空间直线斜截式约束方程,同时结合等式约束滤波方法中的准确测量法应用到PPP的参数估计过程中,形成附加直线轨迹约束的PPP方法。实验表明:在铁路直线轨道约束实验中,收敛时间最高减少60%,定位精度最高提升14.94%,不同实验结果均表明附加直线轨迹约束能提高PPP定位性能。Conventional precise point positioning(PPP)algorithms have not yet considered methods for adding prior information constraints.When the system has inherent prior information,failure to utilize it may lead to waste of information.To this end,this thesis focuses on the constraint information existing in the vehicle's linear motion trajectory,derives and organizes the spatial linear slope-intercept constraint equation,and combines the accurate measurement method in the equation constraint filtering method with the PPP parameter estimation process to form a PPP method with additional linear trajectory constraints.Experiments show that in the railway linear trajectory constraints experiment,the convergence time is reduced by up to 60%,and the positioning accuracy is improved by up to 14.94%.Different experimental results show that additional linear trajectory constraints can improve the PPP positioning performance.

关 键 词：精密单点定位 先验约束信息 等式约束 铁路轨道 收敛时间 

分 类 号：G63[文化科学—教育学]