Abstract：The effects of several types of oppressive broadband interference (BPSK interference, FM interference) on pseudo noise coded fuze system are analyzed. It is found that the correlation output is deteriorated when the interference power is larger than the anti-interference limit of the fuze system. So it is very necessary to excise the above interference before correlation. A new simple technique of excising interference through envelope filtering is put forward. The received signal is quadrature demodulated to inphase and quadphase signal. The instantaneous envelope and phase are got with the inphase and quadphase signal. The envelope of interference is obtained by envelope notch filtering in the frequency domain. The interference is reconstructed using the notched envelope sequence and the phase sequence. Then the reconstructed interference is subtracted from the received signal. It is found by simulation that the technique proposed in this paper can effectively excise the broadband interference, especially for strong interference. And the correlation output is improved obviously. The technique is easy to be understood. It has low computational complexity and therefore is easy to realize.
2006, Vol. 28 
