摘要
本文利用变分伴随方法,结合正则化思想.提出了一种反演单多普勒雷达风场和参数的新方法。首先利用伴随方法导出了反演时所需的泛函梯度,然后进行了数值试验。试验结果表明,在引入误差系数与最优选择正则化参数的前提下,新反演方法不但解决了不适定问题,而且风场、源项和涡旋扩散系数的反演精度比普通反演方法都有提高。同时,新反演方法具有目标泛函下降速度快、迭代次数少、计算效率高等优点。
Based on the variational adjoint methods in comhination with regularization methods,a new method of single-Doppler wind retrieval is proposed. The gradient of functional is deduced which is necessary for the retrieval before the numerical experiments are carried out. The results of experiments show that not only the ill-posed problems are settled, but also the accuracy of the retrieved winds is improved greatly when the regularization technology is applied. At the same time, the new method has many virtues, such as fast descending of the objective functional, small number of iteration and high efficiency of computation.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2005年第3期277-285,共9页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金资助项目(No.90411006)上海市科协重点基金资助项目(No.02DJ14032)
关键词
单多普勒雷达
风场反演
伴随方法
正则化
single-Doppler radar
wind retrieval
adjoint method
regularization method
