摘要
线阵CCD技术已广泛应用于高分辨率卫星遥感影像,但其外方位元素的强相关性使得法方程出现病态,难以得到稳定的解。本文在基于严密成像模型的基础上,采用SPOT卫星影像对几种常见的去相关方法进行了比较,并在谱修正迭代法的基础上,提出了一种新的去相关方法。根据谱修正迭代法中法矩阵的特征,对初始值乘以一个系数,不仅没有改变原有的无偏性质,而且使其对初值的依赖程度大大的降低。分析与试验结果表明,这种改进是有效的。
Linear array CCD has been used in high resolution satellite images widely, but the strong relativity of exterior orientation makes the equation morbid. It is difficult to get the steady solutions. This paper analyzed previous methods for solving the problem of computing the exterior orientation elements based on the strict imaging model. Then it brought forward a better method to avoid the relativity. The method not only kept the agonic characteristic, but also reduced the dependent degree on initial value. Experiments proved that this method was very simple, steady and effective.
出处
《测绘科学》
CSCD
北大核心
2010年第2期49-50,共2页
Science of Surveying and Mapping
基金
国家科技部国际科技合作项目(编号:2006DFA7157
2006DFA71570)
地理空间信息工程国家测绘局重点实验室开放基金项目(编号:A1721)
关键词
外方位元素
相关性
岭估计
谱修正迭代法
exterior orientation elements
relativity
ridge estimate
spectrum correction iteration