NLFM Interference Suppressing Based on Time-Varying AR Modeling and Adaptive IIR Notch Filter  

作　　者：FENG Jining YANG Xiaobo DIAO Zhejun GONG Wenfei WU Siliang 

机构地区：[1]The Electronic Engineering Department, Hebei Normal University, Shijiazhuang 050031, China [2]Shijiazhuang Professional Technology Institute, Shijiazhuang 050081, China [3]School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China [4]School of Information Electronics, Beijing Institute of Technology, Beijing 100081, China

出　　处：《Chinese Journal of Electronics》2011年第4期676-680,共5页电子学报（英文版）

基　　金：This work is supported by the Natural Science Foundation of Hebei Province （No.F2010000442）, Natural Science Foundation of Hebei Province （No.F2010000437）, National Natural Science Foundation of China （No.60974063）.

摘　　要：Uing TVAR （Time varying AR） model and adaptive notch filter is a new method for the non- stationary jammer suppression in DSSS （Direct sequence spread spectrum）. The performance of TVAR model for IF （Instantaneous frequency） estimation will be affected by some factors such as basis functions. Focusing on this problem, the optimal basis function of TVAR model for the IF estimation of the NLFM signal is obtained in this paper. Besides the depth and width of notching, the phase properties of notch filter affect the SINR of correlation out- put to the narrow band jammer suppression in DSSS, in response to the problem the closed solution of correlation output SINR improvement has been derived when a single frequency jammer passes through direct IIR notch filter, and its performance has been compared with those of five coefficient FIR filters. Later, a novel method for NLFM jammer suppression based on Fourier basis TVAR model and direct IIR notch filter is proposed. The simulation results show the effectiveness of the proposed method.

关 键 词：Direct sequence spread spectrum （DSSS） receiver Time varing AR （TVAR） model IIR adaptive notch filter Anti-Jamming. 

分 类 号：TN953.5[电子电信—信号与信息处理] TM83[电子电信—信息与通信工程]