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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。
The shallow stratigraphic survey of Chirp signal is widely used in engineering investigation, geological hazard assessment, hydrate investigation and deep sea resource exploration for its high resolution. Due to the limited bandwidth of the Chirp signal transmission, sidelobes in cross-correlation results have a serious impact. Conventional envelope extraction can suppress sidelobes, but the resolution of data after processing is low. Based on forward modeling, processing and quantitative analysis of continuous thin-layer model with different layer thickness and different reflection coefficient, this paper proposes to suppress the sidelobe by linear frequency-raising processing and improve the resolution of the data. The method is applied to the theoretical model and the actual data, Significant effect.