位场向下延拓的正则化-迭代法

向下延拓是位场数据处理与解释的基本方法,但其不稳定性限制了其在实际资料中的应用。本文首先对四种形式的向下延拓正则化方法进行系统研究,选出稳定性最强的正则化方法与迭代法相结合,由此实现了基于正则化迭代法的稳定向下延拓计算。同时,不同向下延拓方法的滤波特性对比分析结果表明正则化迭代法在稳定性和计算精度方面具有明显的优势。模型试验和实际航磁料处理结果均证实了正则化迭代法具有更强的计算稳定性和计算精度,同时还具有保幅能力强和受迭代次数影响较小的优点。

Regularization-iterative methodfor downward continuation of potential fields

Downward continuation is a basic method for data processing and interpretation in potential fields, but its instability restricts its application in real data. After research on four regularization methods for downward continuation, this paper proposes regularization-iterative method for downward continuation of potential fields based on combination of regularization methods which has strongest stability and iterative method. In addition, the regularization-iterative method has the advantages in stability and calculation accuracy based on comparative analysis of filter characteristics of different downward continuation methods. Both the mode test and the application of real aeromagnetic data show that the new method has stronger stability, higher calculation accuracy, stronger capacity of amplitude preservation and less influenced by iterative times than other methods for downward continuation.