摘要
直扩信号是二阶循环平稳信号,根据谱相关分析方法,利用直扩信号非零循环频率处的谱线特征,可将直扩信号从噪声背景中检测出来。为消除基底噪声,采用电子测量中的3σ准则对直扩信号的循环谱进行了消噪处理,便于实现检测,仿真论证了该方法在低信噪比条件下的有效性。
DS signal is a second order cyclostationary signal. According to spectral correlation analysis, this paper makes use of the spectral features of non- zero cyclic frequency to detect DS signal from a background of niose. In order to remove floor-noise and easy to detect,we adopt 3σ-rule applied in electronic measurement to reduce noise in cyclic spectral, the result of the simulation proves the validity of the technique in low SNR environment.
出处
《现代电子技术》
2008年第13期38-40,共3页
Modern Electronics Technique
基金
重庆市自然科学基金重点项目(cstc
2007ba2017)
关键词
直扩信号
谱相关
信号检测
3σ准则
DS signal
speetral eorre
lation
signal deteetion
3σ-rule
