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Title:: High Precision Seismic Wave Velocity Interferometry Based on Modified Chirp Z Transform

作者:: 杨润海¹; 谭俊卿²; 向涯³; 姜金钟¹; 王彬¹; (1.云南省地震局,云南昆明 650224; 2.云南大学,云南昆明 650091; 3.中国地震局地震研究所中国地震局地震大地测量重点实验室,湖北武汉 430071)

Author(s):: YANG Runhai¹; TAN Junqing²; XIANG Ya³; JIANG Jinzhong¹; WANG Bin¹; (1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.Yunnan University,Kunming 650091,Yunnan,China)(3.Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,Hubei,China)

Keywords:: seismic wave velocity; short time window delay estimation; MCZT; FICP

摘要:: 地震波信号走时差的精确估计是了解地壳介质性质变化及其过程的关键,鉴于互相关的时延检测方法受相关窗口长度和信号信噪比影响较大,将改进的线性调频Z变换谱细化和相关峰精确插值引入到陆地大容量气枪主动源观测中的波速干涉测量中,介绍了一种能够获得高精度走时差的短时窗时延估计方法。模拟实验和实际数据分析表明:本文方法可以获得高精度的信号时延估计值,提高地震信号波速变化计算的精度。

Abstract:: Underground medium are studied by using seismic wave structure change has received more and more attention.Time delay accurate estimate of the seismic signal is the key to understand the nature of crustal medium change and its process.The time delay detection method based on cross-correlation affected by relevant window length and signal SNR is larger.MCZT(Modified Chirp Z Transform)spectrum elaboration and fine interpolation of correlation peak(FICP)is introduced into the land the large capacity air rifle interference wave velocity measurement of active source observation.This paper introduces a way can get high precision time a short window of time delay estimation method.The experimental analysis shows that,the method introduced in this paper can obtain the high precision estimate of signal delay and improve the accuracy of measuring the change of wave velocity of seismic signals.