An method for demodulation from non-stationary ampltitude modulated broad-band signal

The traditional Dectecion of Envelope Modulation on Noise (DEMON) method is difficult to obtain the modulation characteristics when the signal modulation frequency or depth changes with time. For non-stationary modulation characteristics, a modified method ‘HDEMON’ based on Hilbert-Huang Transform (HHT) is given. HDEMON is available for non-stationary mudulation due to its adaptivity and applicability to non-stationary signals. Simulated data and actual radiated noise data analysis show that, HDEMON can extract non-stationary broadband amplitude modulation characteristics, which could suport both modulation source for the target classification and motion analysis.