不用同步信号的相干平均弱信号检测法

A Detection Method of Coherence Average for Weak Signalwithout Synchronous Signal

提出了将周期性信号从噪声中提取的数据处理方法,该方法用分段自相关算法快速计算周期性弱信号的自相关函数的估值,用其自相关函数求出周期性弱信号的周期,采用相干干平均的方法提高信号的信噪比,提取真实信号,其方法不需额外的硬件设备和同步信号,适用于不能提供同步信号的应用,并利用此方法编制了实用程序.实际运行表明,该方法能提高信号细节的分辨能力.

A detection method for weak signal with fast autocorrelation and coherence average is introduced, we can calculate the estimation of autocorrelation with the algorithm of section fast autocorrelation, and calculate the period of the weak signal with autocorrelation, fetch the true signal from the noise with coherence average.We can fetch true signal from noise without extra synchronous signal and hardware, the method is very effective for no synchronous signal. A program is made to test the method. Running results show that it improves signal resolution.