复杂信号环境下非合作突发通信信号的实时检测  

Real-time detection of non-cooperative burst signals in complex environment

作　　者：胡亚[1,2] 吴嗣亮[1] 

机构地区：[1]北京理工大学信息电子学院,北京100081 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《系统工程与电子技术》2012年第7期1463-1468,共6页Systems Engineering and Electronics

基　　金：国防预先研究基金资助课题

摘　　要：现有未知突发信号检测算法是基于噪声加单一突发信号的简单假设的,在实际复杂信号环境会产生大量虚警而失效。针对实际非合作突发通信信号的检测环境除噪声外还包含多个连续信号和一些短突发干扰信号,建立了复杂信号环境模型,提出了适用于此环境的基于短时傅里叶变换(short time Fourier transform,STFT)的时序检测器。该检测器利用突发通信信号时间上短持续的特点剔除连续信号和短突发干扰造成的虚警。对该检测器的检测性能进行了分析和仿真,结果表明在复杂信号环境中当常规检测器由于虚警概率很高失效时,该检测器可以同时获得较低的虚警概率和较高的检测概率,因而适用于复杂信号环境中非合作突发信号检测。该检测器运算量小,易于实时实现。Devised under simple assumption that either noise or a single burst signal exists, the known tran- sient detectors produce a large number of false alarms in real situations and thus become inapplicable. The real situation for non-cooperative burst signal detection is analyzed and modeled as complicated environment contai- ning continuous signals and short-period interferences besides additive noises. A short time Fourier transform （STFT） based sequential detector is proposed to deal with the complicated environment above. The new detec- tor eliminates the false alarms sourced from other signals by identifying their time-lasting differences with that of burst objects. Performance evaluation through theoretical analysis and Monte Carlo simulations demonstrates that the detector is able to achieve the high probability of detection and the low probability of false alarm in the complicated environment. The detector proposed is computational effective and convenient for real-time imple- mentation.

关 键 词：信号检测 非合作突发通信信号 短时傅里叶变换 时序检测器 虚警 

分 类 号：TN911.23[电子电信—通信与信息系统]