GAMIT与TBC混合基线平差的优化算法及精度分析
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摘要
TBC作为天宝推出的商业基线解算软件,其在解算短基线方面效果良好;而GAMIT作为高精度基线处理软件,特别适合解算长距离基线,两者基线解算精度相差甚大,本文以青岛地铁8号线GNSS控制网为例,利用GAMIT解算长距离骨架网,用TBC解算短基线,提出一种基于分别定权、合并平差的优化算法。结果表明该方法形成的基线网内符合性更好,残差加权平方和、中误差等精度指标更高,闭合差分布更为集中,为某些工程GNSS控制网利用此两种软件混合解算平差提供了很好的借鉴。
As a commercial baseline calculation software developed by Trimble,TBC has a good effect in solving short baseline. However,as a high-precision baseline processing software,GAMIT especially suitable for solving long-distance baseline. The accuracy of baseline calculation is quite different between the two calculation software. Taking GNSS control network of Qingdao Metro Line 8 as an example,this paper uses GAMIT to solve long-distance skeleton network and uses TBC to solve short baseline,and puts forward a method based on optimal algorithm of weighted respectively and combined adjustment. The results show that the method has better consistency in the baseline network,higher precision indexes such as residual weighted sum of squares and median error,and more centralized distribution of closure difference. It provides a good reference for some engineering GNSS control networks to use these two kinds of software to solve the adjustment.
As a commercial baseline calculation software developed by Trimble,TBC has a good effect in solving short baseline. However,as a high-precision baseline processing software,GAMIT especially suitable for solving long-distance baseline. The accuracy of baseline calculation is quite different between the two calculation software. Taking GNSS control network of Qingdao Metro Line 8 as an example,this paper uses GAMIT to solve long-distance skeleton network and uses TBC to solve short baseline,and puts forward a method based on optimal algorithm of weighted respectively and combined adjustment. The results show that the method has better consistency in the baseline network,higher precision indexes such as residual weighted sum of squares and median error,and more centralized distribution of closure difference. It provides a good reference for some engineering GNSS control networks to use these two kinds of software to solve the adjustment.
引文
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[2] 邬熙娟,高俊强,黄燕. 小区域GPS网GAMIT解算结果与IGS站选取的关系[J]. 南京工业大学学报·自然科学版,2010,32(4):96～99.
[3] 隆安良. TBC、CosaGPS、Excel相结合在GPS平差中的应用[J]. 铁道建筑技术,2015(1):112～114.
[4] 王智,赵亚波. QDCORS在青岛地铁控制网中的应用研究[J]. 城市勘测,2016(4):106～109.
[5] 戴吾蛟,丁晓利,朱建军. GPS动态变形测量中的多路径效应特征研究[J]. 大地测量与地球动力学,2008,28(1):65～71.
[6] 张双成,张鹏飞,范朋飞. GPS对流层改正模型的最新进展及对比分析[J]. 大地测量与地球动力学,2012,32(2):91～95.
[7] 卢献建,任超. GPS数据处理科研软件与商业软件对比分析[J]. 全球定位系统,2007,32(5):29～32.
[8] 王潜心. GPS数据处理软件中若干问题的研究[D]. 长沙:中南大学,2005.
[9] 王国祥. GPS基线解算与质量控制[J]. 铁道勘察,2005,31(6):7～10.
[10] 王智,刘宝华,张洪德等. 长距离跨海地铁隧道高精度空间基准建立及探讨[J]. 城市勘测,2017(5).