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The Method of Adaptive Time-varying Interference Cancellation based on FRFT for Pseudo-random Coded Fuze |
Zhang Shu-ning; Zhao Hui-chang; Zhang Ai-chen |
School of Electronic engineering and Optoelectronic, NUST, Nanjing 210094, China |
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Abstract The effect of LFM interference on pseudo-random coded fuze system is 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. It is very necessary to excise the above interference. Because there is strong time and frequency coupling between the interference and useful signal, so the method of adaptive time-varying interference cancellation based on FRFT is proposed. The characteristic parameters of interferences are obtained by FRFT. Then the adaptive interference canceler is designed according to the estimated interference parameters. Simulation results show that the above method can effectively excise LFM interference and the correlation output is improved obviously. This method is appropriate for both single component interference and multi-component interferences and it can not be affected by across items.
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Received: 09 November 2006
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