基于F-K分析的次声监测台阵结构设计
|
摘要
次声监测台阵结构的合理设计是抑制环境噪声及增强目标次声信号的一种有效手段。结合目标次声信号的特性,假设了次声监测台阵的几种阵列结构,对于不同频率成分、不同信噪比和不同时间长度声信号的响应情况,采用F-K分析法进行阵列响应计算。计算结果表明五边形六元阵适用于频率较低的次声信号;对于既有低频成分又有高频成分的信号,九元阵的响应较好,因此对于目前所关注的大多数次声信号,九元阵是理想的阵列结构。
Proper structure design of the infrasonic monitoring arrays is an effective means to restrain the environment noise and enhance the target infrasonic signal. Some kinds of array structure were supposed for the infrasonic monitoring station on the foundation of the characteristic of the target infrasound. Each array response of these array structures was calculated based on F-K analysis for different frequency,different signal-to-noise ratio (SNR) and different period length of sound signal. The results indicate that the pentagon array of six elements is appropriate to the infrasound signal which frequency is lower. On the other hand,the nine elements array has better response for the sound signal which is consisted of low frequencies and high frequencies. Consequently,the nine elements array is the perfect array structure for most infrasonic signal which is paid attention to at present.
Proper structure design of the infrasonic monitoring arrays is an effective means to restrain the environment noise and enhance the target infrasonic signal. Some kinds of array structure were supposed for the infrasonic monitoring station on the foundation of the characteristic of the target infrasound. Each array response of these array structures was calculated based on F-K analysis for different frequency,different signal-to-noise ratio (SNR) and different period length of sound signal. The results indicate that the pentagon array of six elements is appropriate to the infrasound signal which frequency is lower. On the other hand,the nine elements array has better response for the sound signal which is consisted of low frequencies and high frequencies. Consequently,the nine elements array is the perfect array structure for most infrasonic signal which is paid attention to at present.
引文
[1]Hedlin Michael A.Reconnaissance of Background Infrasound at Selected Future IMS Locations,Atlantic Ocean,ADA418887[R].CA:California Univ Regents La Jolla Ca Scripps Inst of Ceanography,2003.
[2]Blandford Robert R.Design of Infrasonic Arrays,ADA344356[R].FL:Air Force Technical Applications Center,Patrick AFB,1997.
[3]Blandford Robert R.Detection and Azimuth Estimation by Infrasonic Arrays as a Function of Array Aperture and Signal Coherence,ADA418882[R].FL:Air Force Technical Applications Center,Patrick AFB,2002.
[4]刘云,李志舜.基于信号时频表示的宽带源波达方向估计[J].系统仿真学报,2004,16(7):1560-1562.(LIU Yun,LI Zhi-shun.Direction of Arrival Estimation for Wideband Sources Based on Time-Frequency Signal Representation[J].Journal of System Simulation(S1004-731X),2004,16(7):1560-1562.)
[5]吴淑泉,姜发玉,李韬.高分辨率合成孔径雷达视频模拟器研究[J].系统仿真学报,2006,18(2):347-348.(WU Shu-quan,JIANG Fa-yu,LI Tao.Study on Video Simulator of High Resolution Synthetic Aperture Radar[J].Journal of System Simulation(S1004-731X),2006,18(2):347-348.)
[6]佟玉霞,朱元清.上海地震台阵响应图及其计算方法[J].地震地磁观测与研究,2002,23(2):47-54.
[7]任隽,朱元清,秦浩文.上海地震台站标定及结果分析[J].西北地震学报,2002,24(4):325-329.
[8]李文涛.表面波信号的频率-波数谱(F-K)法分析[D].杭州:浙江大学,2000.
[9]J Michael McKisic.Infrasound and the Infrasonic Monitoring of Atmospheric Nuclear Explosions:A Literature Review,ADA339249[R].Rockville,MD:Tracor Applied Sciences,Inc.,1997.
[2]Blandford Robert R.Design of Infrasonic Arrays,ADA344356[R].FL:Air Force Technical Applications Center,Patrick AFB,1997.
[3]Blandford Robert R.Detection and Azimuth Estimation by Infrasonic Arrays as a Function of Array Aperture and Signal Coherence,ADA418882[R].FL:Air Force Technical Applications Center,Patrick AFB,2002.
[4]刘云,李志舜.基于信号时频表示的宽带源波达方向估计[J].系统仿真学报,2004,16(7):1560-1562.(LIU Yun,LI Zhi-shun.Direction of Arrival Estimation for Wideband Sources Based on Time-Frequency Signal Representation[J].Journal of System Simulation(S1004-731X),2004,16(7):1560-1562.)
[5]吴淑泉,姜发玉,李韬.高分辨率合成孔径雷达视频模拟器研究[J].系统仿真学报,2006,18(2):347-348.(WU Shu-quan,JIANG Fa-yu,LI Tao.Study on Video Simulator of High Resolution Synthetic Aperture Radar[J].Journal of System Simulation(S1004-731X),2006,18(2):347-348.)
[6]佟玉霞,朱元清.上海地震台阵响应图及其计算方法[J].地震地磁观测与研究,2002,23(2):47-54.
[7]任隽,朱元清,秦浩文.上海地震台站标定及结果分析[J].西北地震学报,2002,24(4):325-329.
[8]李文涛.表面波信号的频率-波数谱(F-K)法分析[D].杭州:浙江大学,2000.
[9]J Michael McKisic.Infrasound and the Infrasonic Monitoring of Atmospheric Nuclear Explosions:A Literature Review,ADA339249[R].Rockville,MD:Tracor Applied Sciences,Inc.,1997.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心