基于MATLAB的SSMT-2000大地电磁资料批处理技术

THE BATCH PROCESSING TECHNIQUE FOR MAGNETOTELLURIC DATA WITH SSMT-2000 BASED ON MATLAB

资料处理是大地电磁测深工作中的重要环节。在野外测量数据量大,并且要求相互做远参考处理的情况下,由于SSMT-2000大地电磁资料处理软件在批处理上的限制,室内资料处理的工作量巨大。为了提高工作效率,节约成本,通过研究SSMT-2000的参数文件格式、文件操作及内部模块调用方式,以MATLAB脚本语言为基础编写接口,实现了时间序列傅氏变换,单点阻抗张量ROBUST估计,固定测点或固定参考点的多点远参考阻抗张量ROBUST估计以及多个测点相互远参考阻抗张量ROBUST估计的批量处理。采用批量处理,可为室内人员节省大量时间,更能为整个大地电磁测深工作节约资源。

Data-processing plays an important role in the magnetotelluric （MT） sounding work. For several simultaneous sounding sites, in particular, it is required to process field data with magnetic remote reference, which is time-consuming and demands a huge a- mount of calculation. The professional processing software named SSMT-2000 is commonly used to carry out the work; nevertheless, because of the restriction of the software, the batch processing for data from several sites cant be carried out efficiently. Hence data- processing has become a tedious and long time work for MT workers. In this paper, the authors analyzed the format and the calling pat- tern of parameter files, probed into the problem as to how the internal executables are called by SSMT-2000 and, on such a basis, de- veloped a smart code based on the MATLAB language. The code has the utilities of running a batch processing for fast Fourier trans- form, Robust estimation of impedance tensors for one single site and utilization of magnetic remote reference technique in three ways. The authors can apply the code to process data from many MT sounding sites at one time, which makes multiple-site data processing procedures much simpler and more efficient.