吉林中部供水工程总干线东段GPS控制网数据处理与分析

发布时间：2018-02-04 21:52

  本文关键词： 数据处理 控制点稳定性 椭球膨胀法 抵偿坐标系 GPS　出处：《长春工程学院》2017年硕士论文　论文类型：学位论文

【摘要】：中部城市供水工程输水总干线东段GPS控制网,是为保障该段隧洞工程施工而建立的。该段控制网于2013年9月进行初测,2014年5月又进行了复测。本研究的目的是获取可靠的控制点成果,研究方法和内容主要包括:以LGO+COSAGPS为工具GPS控制网的数据处理过程与方法;利用假设检验检测两期观测成果是否存在系统误差;利用双观测对和多种方法检测控制点位是否稳定;利用最小二乘原理选取最佳抵偿高程面等。通过研究分析得出如下结果:(1)当三维平差采用无约束平差时,最终两期观测的平面坐标成果之间存在明显的系统误差,其中在X方向的较差平均值为-0.98cm,在Y方向的较差平均值为-1.08cm;(2)控制点Z25为不稳定点,其点位差达3.84cm;(3)对两期控制点的大地高平差结果进行比较,其差值平均为5.77cm;(4)满足测区长度综合投影变形≤2.5cm/km的最佳抵偿高程面为225m。同时,得到如下主要结论:(1)为避免两期观测平差成果存在系统误差,两期观测均应有相同的基准;(2)在利用双观测对检验控制点稳定性时,应综合采用多种方法,其中点位误差法和各新点对稳固点的距离比较法是较为简洁可靠的方法;(3)采用最小二乘法求取测区最佳抵偿高程面,可有效解决控制网长度投影综合变形问题,是一种科学、实用的方法。
[Abstract]:The GPS control network in the eastern section of the main main line of the central city water supply project was established to ensure the construction of the tunnel project. The control network was initially measured on September 2013. In May 2014, a retest was carried out. The purpose of this study was to obtain reliable control point results. The research methods and contents mainly include: the data processing process and method of GPS control network with LGO COSAGPS as the tool; The hypothesis test is used to detect whether there is a systematic error in the two periods of observation. The stability of control points is detected by double pair and many methods. By using the least square principle, the optimal offset elevation surface is selected. The following results are obtained by research and analysis: 1) when the three-dimensional adjustment adopts unconstrained adjustment. There are obvious systematic errors between the plane coordinate data observed in the last two periods, in which the average value of the difference in X direction is -0.98 cm, and the average value in Y direction is -1.08 cm. (2) the control point Z25 is an unstable point with a point difference of 3.84 cm; (3) the average value of the difference between the two control points is 5.77 cm. (4) the optimum compensation height for the composite projection deformation 鈮，

本文编号：1491240