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Improving Airgun Signal Detection with small-aperture Seismic Array in Yunnan

Earthquake Research in China 2019年第2期33卷 248-264页

作者： WANG Weijun ZHOU Qingyun KOU Huadong LIU Guiping ZHU Hongbo YAN Kun Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingCEABeijing 100036China Yunnan Earthquake Agency Kunming 650224China

Repeating airgun sources are eco-friendly sources for monitoring the changes in the physical properties of subsurface mediums,but their signals decay quickly and are buried in the noises soon after traveling short *** waveforms from different airgun shots recorded by a single seismic station(shot stacking)is the most popular technique to detect weak signals from noisy backgrounds,and has been widely used to process the data of Fixed Airgun Signal Transmission Stations(FASTS)in ***,shot stacking sacrifices the time resolution in monitoring to recover a qualified airgun signal by stacking many shots at distance stations,and also suffers from persistent local *** this paper,we carried out several small-aperture seismic array experiments around the Binchuan FAST Station(BCFASTS)in Yunnan Province,China,and applied the array technique to improve airgun signal *** results show that seismic array processing combining with shot stacking can suppress seismic noises more efficiently,and provide better signal-to-noise ratio(SNR)and coherent airgun signals with less airgun *** work suggests that the array technique is a feasible and promising tool in FAST to increase the time resolution and reduce noise interference on routine monitoring.

关键词： Airgun Signal Detection small-aperture Seismic Array Binchuan Fixed Airgun Signal Transmission Stations(BCFASTS)

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SHAPED DUAL-REFLECTOR ANTENNA WITH RING FOCUS

引用

Science China Mathematics 1991年第10期34卷 1243-1255页

作者：章日荣杜树祥王汉礼周康健王涛 Institute No.54 Ministry of Machinery & Electronics Industry Shijiazhuang 050002 PRC

The equations of the reflector contours and the radiation patterns of the shaped dual-reflector antenna have been derived, and the methods of designing the antenna are also intro-duced briefly. The calculated and measured results suggest that this new type of antennahas the advantages of low VSWR (voltage standing-wave ratio), low sidelobe, and high *** it opens a bright prospect for the improvement of mid-and small-aperture anten-na performance, and gives the possibility for the realization of the 1990s new standard spec-ified by CCIR (International Radio Consultative Committee) on mid-and small-aperture an-tenna for satellite-communication earth stations.

关键词： low VSWR (voltage standing-wave ratio) low sidelobe high gain mid- and small-aperture reflector antenna with ring focus.

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