| 联合平差中的方差分量估计问题的探讨 |
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| 引用本文： | 成英燕,程鹏飞,顾旦生,张莉,秘金钟,郭春喜,庞尚益.联合平差中的方差分量估计问题的探讨[J].测绘科学,2005,30(2):55-56,63. |
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| 作者姓名： | 成英燕 程鹏飞 顾旦生 张莉 秘金钟 郭春喜 庞尚益 |
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| 作者单位： | 中国测绘科学研究院,北京,100039;陕西测绘局大地测量数据处理中心,西安,710054 |
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| 摘 要： | 天文大地网与GPS空间网联合平差从大的方面分为空间网与地面网两部分。空间网主要是GPS点的三维地心坐标及协方差阵 ;而地面网又涉及到多类观测值 ,主要包括方向观测、导线边、天文方位角三类观测值 ,且各类观测值又分为不同等级的观测。空间网与地面网之间、地面网不同类观测之间及同一类不同观测等级之间的权比不正确将直接影响平差结果 ,因此 ,各类观测值的最佳权匹配就成为联合平差的一个关键。本文就Helmert方差分量简化算法及Baumker简化公式用于联合平差中方差分量估计问题进行讨论 ,并用我国天文大地网 1万点的地面观测数据进行实算、比较、分析 ,以确定联合平差中方差分量估计的方法
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| 关 键 词： | 联合平差 方差分量估计 模型验证 |
| 文章编号： | 1009-2307(2005)02-0051-04 |
Variance component's estimation in the combined adjustment |
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| Abstract: | Various kinds of observations,such as direction observations of different orders,traverse distance observations,astronomical azimuth observations and 3-D geocentric coordinates of GPS control points,have been involved in thecombined adjustment of the Spacial GPS Network and the Astro-geodetic Network.Weight ratios among them are difficult to set reasonablly.Thus,the best setting of the weight ratios among various observations becomes the key problem in the combined adjustment.This paper mainly discusses the simlified Helmet Model and Baumker formula which have been commonly used in variance analyse.As an example,observables of ten thousand of Astro-geodetic points were processed with the above-mentioned methods.Some significent conclusions are reached by comparing the results and the ratio of prior to post covariance. |
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| Keywords: | combined adjustment variance estimation model verify |
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