基于随机共振与信号偏度的超宽带信号检测

UWB Signal Detection Based on Stochastic Resonance and Skewness of Signal

非线性系统随机共振(Stochastic Resonance,SR)可以用来检测微弱超宽带(Ultra Wide Band,UWB)信号。在接收信号只有UWB信号和噪声的情况下,为了进一步提高随机共振方法对UWB信号的检测性能,该文提出了随机共振和信号偏度特征相结合的UWB信号检测方法。即先对未知信号进行随机共振处理,利用随机共振增强有用信号;再求取处理后信号的偏度值,根据预先设定的门限来确定接收信号中是否有UWB信号。仿真实验表明,当信噪比为-15dB时,利用该方法检测UWB信号,检测概率可以达到90%。

Nonlinear system stochastic resonance can be used to detect weak ultra wide band signal. To improve the de-tection probability of stochastic resonance to UWB signal in the condition that there are only UWB ceiver ,this paper proposes a UWB signal detection method that combined with stochastic resonance and nal. Firstly,the unknown signal is processed by stochastic resonance, which can be used to enhance useful signal. Secondly, the skewness of processed signal is computed to make sure whether the received signal is UWB signal. Simulation experi-ments shows that when SNR is -15dB , the detection probability of UWB signal is 90%.