提取初至波到时的改进能量因子算法  

Modified Energy Factor Algorithm to Extract First-break Wave Arrival Time

作　　者：李剑[1] 韩焱[1] 徐利娜 马亮星 

机构地区：[1]中北大学信息探测与处理技术研究所,山西太原030051 [2]中国兵器工业试验测试研究院,陕西华阴714200 [3]山西北方机械制造有限责任公司,山西太原030009

出　　处：《探测与控制学报》2015年第5期94-97,共4页Journal of Detection & Control

基　　金：国家973计划前期研究专项基金资助(2011CB311804);国家自然科学基金科学仪器基础专项基金资助(61227003)

摘　　要：针对目前能量因子算法存在初至波到时提取精度低、误判率高的问题,提出了提取初至波到时的改进能量因子算法。该算法采用三分量能量合成信息作为特征函数,引入高阶统计量因子提高波形幅值突变特征,利用广义S变换对应的瞬时优势频率构建自适应时窗,增强初至波检测因子的时变特性。试验结果表明,提出的改进算法,提取初至波到时误检率降低,精度提高,在地下震源定位、层析成像、地质勘探等地下空间领域具有广泛的应用价值。Considering the problem that the extraction accuracy of first-break wave arrival time is low,and the rate of false is high,a modified method based on generalized S transform and higher order statistics was pro-posed to effectively extract direct first break arrival in this paper.The algorithm introduced higher-order statis-tics to improve the mutation characteristics of the waveform amplitude,used synthesis information of three-com-ponent energy as a characteristic function,and took advantage of the instantaneous dominant frequency corre-sponding to generalized S transform to build an adaptive time window and to strengthen the time-varying proper-ties of first break detection factor.Experimental verification showed that,compared with the energy factor algo-rithm,the proposed adaptive instantaneous energy factor method reduced the false detection rate and improved the accuracy when extracting the primary wave.Besides,it could improve the precision of underground source localization and had wide application in the underground source location,dimensional physical field reconstruc-tion.

关 键 词：初至波到时 地下震源定位 自适应时窗 广义 S 变换 

分 类 号：P315.6[天文地球—地震学] TN911.6[天文地球—固体地球物理学]