The surface wave signals produced in natural seismic are “intact“ and complex, it is the key which eliminating the noise from that signals if we wanted to invert the structure of the earth using the true signal whic...The surface wave signals produced in natural seismic are “intact“ and complex, it is the key which eliminating the noise from that signals if we wanted to invert the structure of the earth using the true signal which the earth produced.The inter-station fundamental-mode surface wave attenuation coefficient was calculated combined the phase-match filter with frequency-domain Wiener filter. The first, we separated the fundamental-mode surface wave from different two original signal which recorded on two stations which are on one big-circle path using phase-matched filter, and then calculating the attenuation coefficient using frequency domain Wiener filter. It is avoided the negative attenuation coefficient that can't be explained. All of this are the base of inverting the inter structure of the earth.展开更多
The main cause of dynamic errors is due to frequency response limitation of measurement system. One way of solving this problem is designing an effective inverse filter. Since the problem is ill-conditioned, a small u...The main cause of dynamic errors is due to frequency response limitation of measurement system. One way of solving this problem is designing an effective inverse filter. Since the problem is ill-conditioned, a small uncertainty in the measurement will came large deviation in reconstncted signals. The amplified noise has to be suppressed at the sacrifice of biasing in estimation. The paper presents a kind of designing method of inverse filter in frequency domain based on stabilized solutions of Fredholm integral equations of the fast kind in order to reduce dynamic errors. Compared with previous several work, the method has advantage of generalization. Simulations with different Signal-to-Noise ratio （SNR） are investigated. Flexibility of the method is verified. Application of correcting dynamic error is given.展开更多
文摘The surface wave signals produced in natural seismic are “intact“ and complex, it is the key which eliminating the noise from that signals if we wanted to invert the structure of the earth using the true signal which the earth produced.The inter-station fundamental-mode surface wave attenuation coefficient was calculated combined the phase-match filter with frequency-domain Wiener filter. The first, we separated the fundamental-mode surface wave from different two original signal which recorded on two stations which are on one big-circle path using phase-matched filter, and then calculating the attenuation coefficient using frequency domain Wiener filter. It is avoided the negative attenuation coefficient that can't be explained. All of this are the base of inverting the inter structure of the earth.
基金The paper is sponsored by National Natural Science Foundation of China(No.50675211)Natural Science Foundation(No.2009011023)Returned Overseas Graduates Foundation(No.2008067) of Shanxi Provincein China
文摘The main cause of dynamic errors is due to frequency response limitation of measurement system. One way of solving this problem is designing an effective inverse filter. Since the problem is ill-conditioned, a small uncertainty in the measurement will came large deviation in reconstncted signals. The amplified noise has to be suppressed at the sacrifice of biasing in estimation. The paper presents a kind of designing method of inverse filter in frequency domain based on stabilized solutions of Fredholm integral equations of the fast kind in order to reduce dynamic errors. Compared with previous several work, the method has advantage of generalization. Simulations with different Signal-to-Noise ratio （SNR） are investigated. Flexibility of the method is verified. Application of correcting dynamic error is given.
