| 非线性最小二乘问题数值迭代法的统一模型及其不适定性 |
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| 引用本文： | 唐利民,朱建军.非线性最小二乘问题数值迭代法的统一模型及其不适定性[J].长沙交通学院学报,2008,24(2):39-43. |
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| 作者姓名： | 唐利民 朱建军 |
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| 作者单位： | 1. 长沙理工大学交通运输工程学院,湖南,长沙,410076;中南大学信息物理工程学院,湖南,长沙,410083
2. 中南大学信息物理工程学院,湖南,长沙,410083 |
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| 摘 要： | 通过综合归纳在路面模量反算和测量平差等领域中求解非线性最小二乘问题的各种数值迭代解法，建立了非线性最小二乘问题数值迭代法的统一模型．根据不适定问题理论，结合非线性最小二乘问题，定义了非线性最小二乘问题的两种不适定性，对产生这两种不适定问题的现象进行了分析，并给出了实例．结果表明，在NLS问题上使用各种数值迭代解法时，需考虑其迭代过程的不适定问题．
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| 关 键 词： | 路面模量反算 测量平差 非线性最小二乘 数值迭代 不适定 |
Unified model and ill-posed property of numerical iterative formula for solving nonlinear least squares problem |
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| TANG Li-min,ZHU Jian-jun.Unified model and ill-posed property of numerical iterative formula for solving nonlinear least squares problem[J].Journal of Changsha Communications University,2008,24(2):39-43. |
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| Authors: | TANG Li-min ZHU Jian-jun |
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| Institution: | TANG Li-min, ZHU Jian-jun ( 1. School of Traffic and Transportation Engineering, Changsha University of Science ＆ Technology, Changsha 410076, China; 2. College of Info-Physics and Geomatics Engineering, Central South University, Changsha 410083, China) |
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| Abstract: | All kinds of numerical iterative methods for solving nonlinear least squares problems that widely exists in inverse calculation of pavement modulus and surveying adjustment fields were summarized,a unified model of numerical iterative formula for solving nonlinear least squares problems was proposed.According to ill-posed problem theory,combined with nonlinear least squares problems,two ill-posed properties of nonlinear least squares problems were defined.The phenomenon of the two ill-posed properties was analysis,and some examples were given.The results show that it needs to consider the ill-posed problem in iterative process when all kinds of numerical iterative methods for NLS problems are used. |
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| Keywords: | inverse calculation of pavement modulus surveying adjustment nonlinear least squares numerical iterative ill-posed |
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