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三维解析信号法是最近几年发展起来的磁异常的快速自动解释的新方法。它能迅速推断磁源的水平位置和埋深。我们在Ｒｏｅｓｔ等人１９９２年推出的解析信号法的基础上作了改进。推导出了几种规则形体利用解析信号振幅曲线求埋深的方法。使求埋深的精度大为提高。同时还推导出了一种算法简单、准确、可靠的自动搜索异常走向的新方法。在用钟形函数拟合解析信号振幅曲线时，引进了收敛性较好的ＬＭＧＱＴ最优化算法。模型计算结果表明，这种方法的效果是令人满意的，是很有潜力的一种地球物理方法。
Three-dimensional analytic signal method is a new method of rapid automatic interpretation of magnetic anomalies developed in recent years. It quickly deduces the horizontal position and depth of the magnetic source. We made improvements based on the analytic signal method introduced by Roest et al. In 1992. Several methods for deriving the buried depth from the signal amplitude curve are deduced. So that the accuracy of buried depth greatly improved. At the same time, a new method of automatic search of anomalies with simple, accurate and reliable algorithm is deduced. When using the bell-shaped function to fit and analyze the signal amplitude curve, LMGQT optimization algorithm with good convergence is introduced. The results of model calculation show that the effect of this method is satisfactory and it is a promising geophysical method.