%0 Journal Article
%T GPS ELEVATION FITTING BASED ON EM ALGORITHM FOR LACK OF DATA<br>缺失数据下基于EM算法的GPS高程拟合
%A Lin Dongfang
%A Song Yingchun
%A Du Kun
%A Xiao Qinqin
%A <br>林东方
%A 宋迎春
%A 杜琨
%A 肖琴琴
%J 大地测量与地球动力学
%D 2012
%I 
%X Restricted by the observing conditions,some important data of GPS elevation fitting are often missed or not enough.Using conventional methods will reduce the fitting accuracy of the quasi-geoid.By use of the EM algorithm with the addition of "potential data",conditional expectation of the missing data,it can effectively improve the accuracy of GPS elevation fitting for lack of data.
%K missing data
%K EM algorithm
%K elevation fitting
%K related plane fitting
%K quadratic surface fitting<br>缺失数据
%K EM算法
%K 高程拟合
%K 平面相关拟合
%K 二次曲面拟合
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=DA72A78627FE64EAA572951EA05D274A&jid=73A1A428591E600EF664B596512A2997&aid=28538CA98C30007840E996DC3889DD00&yid=99E9153A83D4CB11&vid=9971A5E270697F23&iid=0B39A22176CE99FB&sid=12DC19455C3A2FA8&eid=E22B6B8FE86DD8F9&journal_id=1671-5942&journal_name=大地测量与地球动力学&referenced_num=0&reference_num=0