Development and application of air-gun signal real-time processing system
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摘要: 气枪人工震源探测过程中，为了实现数据实时处理，及时监控气枪信号激发情况，本文采用Java编程自主研发一套气枪信号实时处理系统.该系统主要采用频谱白化叠加技术和实时递归算法实现自动叠加和实时滤波功能，并设计开发出单炮实时滤波显示界面、多炮自动叠加显示界面、台站分布界面.系统应用于2015年福建及台湾海峡地壳深部构造探测实验中，实验结果得出棉花滩水库300次叠加可以清晰的追踪到315 km的S和220 km的P，S明显强于P；石黄峰水库300次叠加可以较好的追踪到294 km的S且隐约可以追踪到170 km的P，P很弱；海域SP74固定点300次叠加可以清晰的观测到372 km的P、S，且P、S发育都较强，其中在200 km后，可以很清晰的观测到P系列存在多组震相；研究表明：海上的激发效果优于陆地，水库底部的淤泥层会对信噪比造成不利影响.另外，系统整体运行稳定，功能及性能达到了设计预期，证明了系统设计合理性与实用性.该系统实时处理结果为此次实验快速有效评定激发效果及指挥部作出决策发挥着至关重要的作用.Abstract: In order to achieve the data real-time processing and timely monitoring the excitation condition of air-gun signal in air-gun artificial source detection process. A real-time processing system of air-gun signal is researched and developed by Java programming in the independent. The system mainly use spectrum whiten superposition and real-time recurrent algorithm to realize the function of automatic stacking and real-time filtering. And real-time filter's display interface of single shot,automatic overlay display interface of multiple shot,station distribution display interface are designed and developed. Then system was applied in the detection experiments of deep crust structures in Fujian and Taiwan strait in 2015. The experimental results reach that signal superposition of 300 times which the S clear observation distance is 315 kilometers, the P observation distance is 220 kilometers and S is obvious stronger than P in Mianhuatan reservoir; Signal superposition of 300 times which the S clear observation distance is 294 kilometers, the P faint observation distance is 170 kilometers and P is very weak in Shihuangfeng reservoir; Signal superposition of 300 times which the P and S clear observation distance are 372 kilometers, the P and S develop stronger and the multiple sets of seismic phase are clearly observed after 200 kilometers in offshore fixed point of SP74. The research has shown that the excitation effect of the sea is superior to the land and the signal to noise ratios is adversely affected at the bottom of the reservoir silt layer. In addition, the overall system operation is stable, function and performance meet the design expectations, which verify that the system design is reasonable and practical. Real-time processing results of the system play a vital role for evaluating rapid and valid explosive effect and making decision in the headquarters.
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