利用GPS阵列观测数据提取地震波信息的波束聚焦法
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摘要
介绍一种利用GPS阵列高频观测数据提取地震面波信息的波束聚焦法。通过在GPS坐标序列的垂直分量中加入模拟的瑞利波信号,得到GPS阵列观测站模拟地震波记录,分析了波束聚焦法在不同信噪比下提取地震波信号的能力。结果表明,当信噪比为1.5时,不能获得正确的慢度估值;当信噪比为3时,提取的慢度估值接近理论值。
A method of beam forming for processing high-rate GPS data and extracting seismic wave information is introduced.Simulated seismic waves of each GPS station are synthesized by adding simulated Rayleigh waves into vertical component of GPS coordinates series.The capacity of beam forming to extract seismic wave information of different SNR(signal to noise ratio) is analyzed.The results indicate that,the correct value of slowness cannot be obtained when the SNR is 1.5,while it is close to the theoretical value when the SNR ratio is 3.
A method of beam forming for processing high-rate GPS data and extracting seismic wave information is introduced.Simulated seismic waves of each GPS station are synthesized by adding simulated Rayleigh waves into vertical component of GPS coordinates series.The capacity of beam forming to extract seismic wave information of different SNR(signal to noise ratio) is analyzed.The results indicate that,the correct value of slowness cannot be obtained when the SNR is 1.5,while it is close to the theoretical value when the SNR ratio is 3.
引文
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7 King R W and Bock Y.Documentation for the GAMIT GPSanalysis software[M].Mass.Inst.of Tech.,Scripps Inst.Occeangr.,2003.
8苏小宁,等.基于TRACK进行GPS单历元定位[J].大地测量与地球动力学,2009,(3):100-103.(Su Xiaoning,et al.Single epoch GPS positioning based on track module[J].Journal of Geodesy and Geodynamics,2009(3):100-103)
9伍吉仓,孙亚峰,刘朝功.连续GPS站坐标序列共性误差的提取与形变分析[J].大地测量与地球动力学,2008,(4):97-101.(Wu Jichang,Sun Yafeng and Liu Cha-ogong.Extraction of common mode errors for continuous GPSnetworks and deformation analysis[J].Journal of Geodesyand Geodynamics,2008,(4):97-101)
10胡守超,伍吉仓,孙亚峰.区域GPS网3种时空滤波方法的比较[J].大地测量与地球动力学,2009,(3):95-99.(Hu Shouchao,Wu Jicang and Sun Yafeng.Comparisonamong three spatiotemporal filtering methods for regionalGPS networks analysis[J].Journal of Geodesy and Geody-namics,2009,(3):95-99)
2 Davis J P and Smalley R.Love wave dispersion in centralNorth America determined using absolute displacement seis-mograms from high-rate GPS[J].J.Geophys.Res.,2009,114,B11303,doi:10.1029/2009JB006288.
3孟国杰,等.GPS高频数据处理方法及其在地震学中的应用研究进展[J].国际地震动态,2007,343(7):26-31.(Men Guojie,et al.Data processing methods of high rateGPS and its application to seismology[J].Recent develop-ment in Word Seismology,2007,343(7):26-31)
4殷海涛,等.利用高频GPS技术进行强震地面运动监测的研究进展[J].地球物理学进展,2009,24(6):2 012-2 019.(Yin Haotao,et al.Progress on monitoring strongearthquake ground motions using high-rate GPS[J].Progressin Geophys,2009,24(6):2 012-2 019)
5 Nikolaidis R,et al.Seismic wave observation with the GlobalPositioning System[J].J.Geophys.Res.,2001,106:218097-21 916.
6 Gang Chen.GPS kinematic positioning for the airborne laseraltimetry at Long Valley,California[D].Mass.Inst.ofTech.,USA,1998.
7 King R W and Bock Y.Documentation for the GAMIT GPSanalysis software[M].Mass.Inst.of Tech.,Scripps Inst.Occeangr.,2003.
8苏小宁,等.基于TRACK进行GPS单历元定位[J].大地测量与地球动力学,2009,(3):100-103.(Su Xiaoning,et al.Single epoch GPS positioning based on track module[J].Journal of Geodesy and Geodynamics,2009(3):100-103)
9伍吉仓,孙亚峰,刘朝功.连续GPS站坐标序列共性误差的提取与形变分析[J].大地测量与地球动力学,2008,(4):97-101.(Wu Jichang,Sun Yafeng and Liu Cha-ogong.Extraction of common mode errors for continuous GPSnetworks and deformation analysis[J].Journal of Geodesyand Geodynamics,2008,(4):97-101)
10胡守超,伍吉仓,孙亚峰.区域GPS网3种时空滤波方法的比较[J].大地测量与地球动力学,2009,(3):95-99.(Hu Shouchao,Wu Jicang and Sun Yafeng.Comparisonamong three spatiotemporal filtering methods for regionalGPS networks analysis[J].Journal of Geodesy and Geody-namics,2009,(3):95-99)
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