On the basis of analyzing the basic features of impact signal noise from reactor loose parts, the wavelet nonlinear threshold value filtering method for the use of impact signal extraction is studied.

The signal modulation of velocity deception jamming is complex, and it is hard to complement anti jamming using the statistical feature extraction method.

In the paper, the calculating method of signal extraction filter pass-band according to the paper-counting speed and the utility circuit of separating strong interference in pass-band are given.