利用GNSS基线检核平面控制网边长的方法研究  

Research on the Method of Checking the Side Length of Horizontal Control Network Using GNSS Baseline

作　　者：陈舫益 王友昆 郭忠明 谢正明[3] CHEN Fangyi;WANG Youkun;GUO Zhongming;XIE Zhengming(Yunnan Surveying and Mapping Product Testing Station,Kunming 650034,China;Kunming Surveying and Mapping Research Institute,Kunming 650000,China;Yunnan Vocational College of Land and Resources,Kunming 652501,China)

机构地区：[1]云南省测绘产品检测站,云南昆明650034 [2]昆明市测绘研究院,云南昆明650000 [3]云南国土资源职业学院,云南昆明652501

出　　处：《城市勘测》2023年第3期116-118,共3页Urban Geotechnical Investigation & Surveying

基　　金：云南省教育厅科学研究基金项目(2019J0486)。

摘　　要：利用GNSS三维无约束平差得到的空间基线,分别采用GNSS大地高差、水准高差和修正水准高差将GNSS基线改平再进行归化投影后,对平面控制网的边长进行检核。数据表明,采用大地高差计算的归算边由于无须考虑基线两端点高程异常差的影响,归算边长与成果坐标反算边长的相对差及其互差较小且趋势平稳,水准高差归算边长与坐标反算边长的相对差较大且呈现出明显的跳跃,当利用高程异常差对水准高差修正后,边长检核相对差及其互差明显减小,且与大地高差归算边的检核结果趋于一致。由此得出结论,直接利用GNSS三维无约束平差得到的基线,采用大地高差改平并归化投影后,对控制网边长进行检核的方法是可行的。Using the spatial baseline obtained from the three-dimensional unconstrained adjustment of GNSS,the GNSS geodetic height difference,leveling height difference and corrected leveling height difference are used to level the GNSS baseline,and then the side length of the horizontal control network is checked.The data show that the reduced side calculated by geodetic height difference does not need to consider the influence of the elevation anomaly difference at both ends of the baseline,the relative difference and mutual difference between the reduced side length and the result coordinate inverse side length are small and stable,and the relative difference between the leveling height difference reduced side length and the coordinate inverse side length is large and shows an obvious jump.When the elevation anomaly difference is used to correct the leveling height difference,the relative difference and mutual difference of side length check are significantly reduced,and it is consistent with the verification results of the reduced edge of geodetic height difference.It is concluded that it is feasible to check the side length of the control network by directly using the baseline obtained from the three-dimensional unconstrained adjustment of GNSS,using the geodetic height difference to adjust and reduce the projection.

关 键 词：GNSS 无约束平差 基线 检核 边长 变形 

分 类 号：P228[天文地球—大地测量学与测量工程]