摘要
为提高高速铁路自由设站CPⅢ三角高程测量的精度,可采用加入单侧水准测量的CPⅢ三角高程测量法进行测站的天顶距改正。实测数据显示,改正后的CPⅢ点三角高程与水准高程较差落在[-3 mm,3 mm]之内的占99. 29%,较改正前提高3. 58%;改正后CPⅢ三角高程中误差全部落入[-2 mm,2 mm]之内;改正后相邻CPⅢ点间纵横向高差较差精度得以提高。研究结果表明,单侧水准测量法可以提高CPⅢ三角高程测量的精度,且只需对CPⅢ控制网单侧控制点进行水准测量,在一定程度上提高了CPⅢ控制网的工作效率,具有实用价值。
To improve the precision of CPⅢtrigonometric levelling on free station of high speed railway, the zenith distance correction of the station can be carried out by CP Ⅲtrigonometric leveling method with unilateral leveling. Measured data show that about 99.29% of the difference values between the leveling elevation and the trigonometric elevation of the CPⅢcontrol points are from -3 mm to 3 mm after the correction by the unilateral leveling method, which increases by 3.58% compared with the result before correction. The mean square errors of CPⅢtriangle elevation all fall into the range from -2 mm to 2 mm after the correction of the zenith-angle observations. The accuracy of the height difference of longitudinal and lateral adjacent point after the correction of the zenith-angle observations is improved. The result of research shows that the method of unilateral leveling can improve the precision of CPⅢtrigonometric leveling, and only one side control points of CPⅢcontrol network need to be levelled. The method improves the work efficiency of CPⅢcontrol network to a certain extent and has a great practical value.
作者
任利敏
常艳美
孙德安
Ren Limin;Chang Yanmei;Sun Dean(Traffic Engineering College, Huanghe Jiaotong University, Jiaozuo 454150, China;Zhengzhou He Zhong Jing Xuan Information Technology Co., Ltd, Zhengzhou 450000, China;Changsha Zhongzhi Information Technology Development Co., Ltd, Changsha 410000, China)
出处
《铁道勘察》
2019年第3期38-42,共5页
Railway Investigation and Surveying
关键词
高速铁路
CPⅢ三角高程测量
天顶距改正
单侧水准测量法
High-speed rail
CPⅢ trigonometric levelling method
Zenith distance correction
Unilateral leveling method