Chirp technology is an acoustic tool for imaging the shallow seabed with a high resolution, used for investigations of modern to Quaternary sedimentary structures and processes and more applied goals, such as hazard surveys for drilling, archeology, geology or engineering fields. In this paper, we present new methods that improve such imaging. During the standard acquisition, the Chirp waveforms are converted into analytic signals and only their envelope is preserved and interpreted, because the highly oscillating signal is otherwise difficult to be identified visually. Doing so, however, the phase information is lost, and the final processing is limited mainly to simple time-varying gain recovery or filtering. We present a work flow including a derivative step to transform the enveloped signal into a seismic-like waveform. In this way, we can apply processing tools as FX deconvolution and migration to improve the signal/noise ratio and reduce diffractions. This method allows reviving standard and legacy Chirp data where the full-waveform information is missing.

rp技术是一种用于对浅海底进行高分辨率成像的声学工具，用于调查现代至第四纪的沉积结构和过程以及更多的应用目标，例如钻探，考古，地质或工程领域的灾害调查。在本文中，我们提出了改善这种成像的新方法。在标准采集期间，线性调频波形被转换为分析信号，并且仅保留和解释了它们的包络，因为否则很难从视觉上识别出高振荡信号。然而，这样做会丢失相位信息，并且最终处理主要限于简单的随时间变化的增益恢复或滤波。我们提出了一个工作流程，其中包括一个派生步骤，用于将包络信号转换为类似地震的波形。这样，我们可以将处理工具用作FX解卷积和迁移，以改善信噪比并减少衍射。此方法允许在缺少全波形信息的情况下恢复标准Chirp数据和传统Chirp数据。