突出薄层特征的Chirp信号源浅地层剖面资料的处理研究

Chirp信号的浅地层剖面调查因其高分辨率的特点广泛应用于工程勘察、地质灾害评估、水合物调查、深海资源勘查等领域。由于Chirp信号发射频带宽度限制,互相关结果中旁瓣影响严重。常规提取包络处理能压制旁瓣,但处理后资料分辨率低。本文通过不同层厚以及不同反射系数连续薄层模型的正演、处理和定量分析,提出用线性提频处理方法压制旁瓣和提高资料的分辨率,将此方法用于理论模型和实际资料,效果显著。 

Study on Data Processing of Sub-bottom Profile Based on the Chirp Signal in Order to Distinguish Thin Layer

Sub-bottom profiler based on Chirp signal is widely used in the fields of engineering investigation, geological hazard assessment, gas hydrate investigation and deep sea resources exploration because of its high resolution. Due to the narrow bandwidth of the Chirp signal, the side lobe of cross-correlation result is serious. Conventional extraction envelope processing can suppress side lobe, but the resolution of the data is low. In this paper, the different theoretical models and the actual data are processed by the method of mutual correlation, extracting amplitude envelope and linear frequency extraction and their results are remarkable.