Fast evaluation method research for marine electromagnetic data collection based on time sequence search

In marine electromagnetic exploration, the successful application of high frequency acquisition technology and the realization of fast storage mode increased the data storage capacity and accuracy, while at the same time, it also increased the difficulty of data quality verification. In the course of the experiment, the data acquisition of next batch will be prepared through the quick data quality analysis and health test of the collection equipment. In order to achieve rapid pre-evaluation, this paper uses the extracted feature point method and the Euclidean distance measure to obtain the effective signal template. The improved lifting wavelet algorithm can achieve the data dimension reduction. And the Euclidean distance measurement can help to find the similarity curve. According to the characteristics of the marine electromagnetic data, the effective signal, the overflow signal and the pulse signal can be quickly found in the data, and finally, the quality evaluation is given according to the search result. Through the experimental test, this program can quickly pre-evaluate a large number of data and give accurate pre-evaluation results.