An automatic detection method of amplitude modulated broad-band signal
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摘要: 给出了一种自动检测解调谱线谱的方法。该方法是一种双门限检测过程,首先通过选择低的检测门限和利用线谱的形状特点进行线谱识别来完成第一次检测,延迟一段时间后利用该时刻前后多个时刻的解调谱的线谱识别情况剔除噪声、自动生成中间丢失的线谱来完成第二次检测。分析表明,此线谱检测方法并不需事先知道调制信号的幅值、根数、位置、起止时间等信息,却能在低信噪比下自动地以高检测概率和低虚警概率检测解调谱的线谱。Abstract: A method of automatic detection of line-spectrum in DEMON (Detection of Envelope Modulation on Noise) spectra is given. The proposed method is a double threshold detection process, it implements first detection process by line-spectrum recognition, which chooses the low detection threshold and makes use of the characteristics of line-spectrum; then delays some time and implements the second detection process, which makes use of the information about line-spectrum of past and followed multiple frames DEMON spectra to get rid of noise points and produce missed line-spectrum points. The analysis shows that this method can automatic detect line-spectrum in DEMON spectra with high detection probability and low false probability without knowing anything about amplitude, position, number, start and end time of amplitude modulated broad-band signal in advance at low signal to noise vatio.
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