發(fā)布時(shí)間：2018-02-04 21:52

  本文關(guān)鍵詞： 數(shù)據(jù)處理 控制點(diǎn)穩(wěn)定性 橢球膨脹法 抵償坐標(biāo)系 GPS　出處：《長(zhǎng)春工程學(xué)院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：中部城市供水工程輸水總干線東段GPS控制網(wǎng),是為保障該段隧洞工程施工而建立的。該段控制網(wǎng)于2013年9月進(jìn)行初測(cè),2014年5月又進(jìn)行了復(fù)測(cè)。本研究的目的是獲取可靠的控制點(diǎn)成果,研究方法和內(nèi)容主要包括:以LGO+COSAGPS為工具GPS控制網(wǎng)的數(shù)據(jù)處理過(guò)程與方法;利用假設(shè)檢驗(yàn)檢測(cè)兩期觀測(cè)成果是否存在系統(tǒng)誤差;利用雙觀測(cè)對(duì)和多種方法檢測(cè)控制點(diǎn)位是否穩(wěn)定;利用最小二乘原理選取最佳抵償高程面等。通過(guò)研究分析得出如下結(jié)果:(1)當(dāng)三維平差采用無(wú)約束平差時(shí),最終兩期觀測(cè)的平面坐標(biāo)成果之間存在明顯的系統(tǒng)誤差,其中在X方向的較差平均值為-0.98cm,在Y方向的較差平均值為-1.08cm;(2)控制點(diǎn)Z25為不穩(wěn)定點(diǎn),其點(diǎn)位差達(dá)3.84cm;(3)對(duì)兩期控制點(diǎn)的大地高平差結(jié)果進(jìn)行比較,其差值平均為5.77cm;(4)滿足測(cè)區(qū)長(zhǎng)度綜合投影變形≤2.5cm/km的最佳抵償高程面為225m。同時(shí),得到如下主要結(jié)論:(1)為避免兩期觀測(cè)平差成果存在系統(tǒng)誤差,兩期觀測(cè)均應(yīng)有相同的基準(zhǔn);(2)在利用雙觀測(cè)對(duì)檢驗(yàn)控制點(diǎn)穩(wěn)定性時(shí),應(yīng)綜合采用多種方法,其中點(diǎn)位誤差法和各新點(diǎn)對(duì)穩(wěn)固點(diǎn)的距離比較法是較為簡(jiǎn)潔可靠的方法;(3)采用最小二乘法求取測(cè)區(qū)最佳抵償高程面,可有效解決控制網(wǎng)長(zhǎng)度投影綜合變形問(wèn)題,是一種科學(xué)、實(shí)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，

本文編號(hào)：1491240