【摘要】：次聲信號檢測是次聲事件監(jiān)測的重要環(huán)節(jié),常用的短時(shí)平均與長時(shí)平均之比STA/LTA(Short Term Average to Long Term Average)和著名的逐次多通道互相關(guān)方法PMCC(the Progressive Multiple Cross-Correlation)誤檢率都比較高.為此,提出一種時(shí)頻域信號能量統(tǒng)計(jì)的次聲信號檢測方法,其基本原理是根據(jù)目標(biāo)信號與噪聲的頻域分布差異,采用窄帶分頻技術(shù)將待檢波形變換到時(shí)頻域,按時(shí)頻格點(diǎn)計(jì)算局部平均能量與全局平均能量之比,當(dāng)比值大于設(shè)定閾值時(shí),認(rèn)為該格點(diǎn)屬于目標(biāo)信號的一部分。以國際監(jiān)測系統(tǒng)次聲臺站監(jiān)測數(shù)據(jù)為對象進(jìn)行了實(shí)驗(yàn)研究,并與PMCC檢測結(jié)果進(jìn)行了比較,結(jié)果表明所提出的信號檢測方法對微弱次聲信號檢測能力強(qiáng)、誤檢信號少.
[Abstract]:Infrasound signal detection is an important link in infrasound event monitoring. The ratio of short-time average to long-time average (STA/LTA (Short Term Average to Long Term Average) and the well-known successive multichannel cross-correlation method (PMCC (the Progressive Multiple Cross-Correlation) are both relatively high in error detection rate. Therefore, a method of infrasound signal detection based on energy statistics in time-frequency domain is proposed. The basic principle is to transform the waveform to be detected in time-frequency domain according to the difference of frequency distribution between target signal and noise, and the narrow-band frequency division technique is used to transform the waveform to time-frequency domain. The ratio of local average energy to global average energy is calculated by time-frequency lattice point. When the ratio is greater than the threshold value, the lattice point is considered to be part of the target signal. The infrasound monitoring data of the international monitoring system are studied experimentally and compared with the results of PMCC. The results show that the proposed signal detection method has a strong ability to detect weak infrasound signals and less false signals.
【作者單位】： 禁核試北京國家數(shù)據(jù)中心;
【基金】：國防預(yù)研基金資助
【分類號】：TB52;TN911.23

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉喜武;劉洪;李幼銘;年靜波;;局域波分解及其在地震信號時(shí)頻分析中的應(yīng)用[J];地球物理學(xué)進(jìn)展;2007年02期

2 謝金來,謝照華;大氣核爆炸次聲監(jiān)測系統(tǒng)[J];核電子學(xué)與探測技術(shù);1997年06期

3 劉俊民;唐偉;王曉明;王海軍;唐恒專;;次聲信號產(chǎn)生機(jī)理與特性分析[J];環(huán)境工程;2010年04期

4 吳富梅;張曉東;;幾種不同時(shí)頻分析法對INS信號的分析和比較[J];測繪科學(xué)技術(shù)學(xué)報(bào);2010年02期

5 劉林,郝保國;時(shí)頻分析理論和應(yīng)用[J];計(jì)算機(jī)自動(dòng)測量與控制;2001年04期

6 蔡希玲,呂英梅;地震數(shù)據(jù)時(shí)頻分析與分頻處理[J];勘探地球物理進(jìn)展;2005年04期

7 唐偉;劉俊民;王曉明;邱宏茂;蓋磊;王海軍;;互相關(guān)算法在次聲監(jiān)測數(shù)據(jù)處理中的應(yīng)用[J];環(huán)境工程;2010年06期

8 楊訓(xùn)仁;臺風(fēng)次聲的射線尋跡[J];聲學(xué)學(xué)報(bào);1981年01期

9 張緒省，孫金瑋，趙新民;用時(shí)頻分析方法分析非平穩(wěn)信號[J];宇航計(jì)測技術(shù);1995年05期

10 宋知用,屠q，

本文編號：2286035