基于希尔伯特变换的Chirp信号浅地层剖面数据分析及转换

浅地层剖面系统在海洋工程勘察、海洋矿产资源探测等方面发挥着重要的作用。美国EdgeTech公司生产的3200系列是一种应用较为广泛的Chirp信号浅地层剖面系统,该仪器原始记录的JSF格式数据与传统的SEGY地震数据格式存在很多不同的地方,具体体现在文件头和道头部分,特别是数据记录方式上它同时记录了包络信号和振幅信号两种类型的数据。因此,编写适用的C程序代码将JSF原始数据转换为包络信号和振幅信号两种类型的SEG-Y标准地震数据,并运用该程序读取并转换了南海北部某区域的实测浅剖数据,并分析了浅剖资料解释中采用包络信号数据的原因,为利用振幅信号数据反演海底反射系数等后续工作奠定了基础。

Sub-bottom Profile Data Analysis and Transformation for the Chirp Signal Based on Hilbert Transform

Sub-bottom profile system has played an important role in the marine engineering survey,exploration of marine mineral resources,et al.The kind of 3200 series sub-bottom profile system produced by EdgeTech Company of America is a widely used sub-bottom profile based on chirp signal.The JSF format is very different from the standard SEG-Y format,embodied on file header and trace header.Especially,the original data of JSF format include amplitude data and envelop data.At the same time,the code of program with C language is compiled to read the original data of JSF format and transform the data to two types of seismic data of SEG-Y format.Finally,practical data in the northern South China Sea was read and converted by the program.The reason why envelop data profile was adopted to interpret sea-bottom geological structure was explained,which has established foundation for inversion of seabed reflection coefficient with the amplitude data.