利用二次相关时延检测方法提升气枪信号时延估计精度的研究

Study on Enhancing the Accuracy of Time Delay Estimation of Air-gun Signal Using the Second Correlation Delay Detection Method

由于观测台站距离较远、观测环境不佳以及前处理过程的干扰等因素,气枪主动源部分台站的格林函数信噪比较低,波速变化检测结果误差较大。利用二次相关时延检测,先经模拟测试,再将其应用到宾川主动源气枪信号的时延检测中。通过模拟研究和实际资料处理对比,结果表明:二次相关方法具有较好的抗干扰性,二次相关后的时延检测结果比直接时延检测结果更加稳定。

Because of the further distance of the observation station,poor detection environment and interference in data processing,the signal to noise ratio of some stations’ Green functions of the air-gun source receiving network are lower and the error of detection result of wave ratio is large. We first use the second correlation method for simulation testing,and then apply the method to the time delay detection of the Binchuan air-gun signal. Comparison results between the simulation and processing of air-gun signal shows that the time delay estimation based on the second correlation method has better anti-interference and the calculated results of it are more stable than that of the direct delay detection method.