自适应非线性滤波技术在导航接收机的应用  

Nonlinear adaptive filter technology for radio navigation receiver adopting

作　　者：杨莘元[1] 刘楠[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2007年第6期694-696,701,共4页Journal of Harbin Engineering University

摘　　要：针对典型海域干扰噪声表现为大气噪声和随机窄带干扰叠加的特点,提出了直接序列扩频体制的无线电导航接收机中窄带干扰抑制的方法,即在解扩前通过自适应非线性滤波技术来预测干扰信号的频率,从而衰减窄带干扰.将近似条件均值滤波函数应用于自适应非线性滤波的干扰预测中,描述了该系统的状态空间模型并对导航接收机输出信噪比进行计算.计算机仿真对比表明,该方法比传统的扩频接收机更优,不仅提高了导航接收机的输出信噪比,而且提高了系统的稳定性.An adaptive nonlinear filter is presented which introduces direct sequence spread spectrum techniques for narrow-band interference suppression of atmospheric radio noise mixed with narrow-band interference. The filter can estimate the unknown jammer＇s instantaneous frequency within the received signal using the approximate conditional mean function. The model of the filter is given and the signal-to-noise ratio is computed. Adaptive nonlinear filters based on the approximate conditional mean function are compared with conditional FIR filters. Simulation results show that the adaptive nonlinear filter has a higher SNR and better performance for suppressing narrowband interference than a FIR filter.

关 键 词：窄带干扰抑制 直接序列扩频 自适应非线性滤波器 近似条件均值滤波函数 

分 类 号：TN911[电子电信—通信与信息系统]