利用DS—UWB信号周期平稳的特性,根据DS—UWB信号与高斯白噪声在自相关域上的差异,提出了一种DS—UWB信号参数估计的自相关算法。该算法可以在自相关积分时间不同的情况下,准确地估计DS—UWB信号伪码周期和伪码码片宽度,为下一步实现DS—UWB信号的细微特征分析提供了参考。理论分析和仿真实验都证明了该方法在低信噪比下非常有效。
According to the difference between Direct Sequence spread spectrum ultra wideband (DS-UWB) signals and Guassion noise in correlation domain based on the characteristics of cycle-stationary signals, a correlation method using parameter estimation is proposed. This method can estimate accurately the period and chip interval of Pseudo Noise(PN) sequence under different inte- gral duration of correlation. The estimated period and chip interval of PN sequence can be used to analyze the fine feature of DS-UWB signals. Both theoretic analysis and experimental results show that this approach is very effective in lower SNR.