基于小波包变换及TRLMS抑制脉冲干扰的方法

Adaptive suppression of pulse interference based on wavelet packet transform and TRLMS

为了解决航空无线电导航服务频段附近的脉冲干扰影响接收机工作的问题,并进一步提高全球导航卫星系统(GNSS)中的脉冲干扰抑制能力,提出了基于小波包变换及变换域最小均方根算法(TRLMS)来抑制脉冲干扰。通过最佳小波函数分解,跟踪定位脉冲干扰所处频带,并采用TRLMS自适应滤波技术取代常规小波包固定阈值方法对干扰进行抑制。仿真实验结果表明,所提方法相比其他的干扰抑制均方根误差更小,解决了有用信号丢失的问题,具有更好的干扰抑制性能。

An adaptive method based on wavelet packet transform and TRansform domain Least Mean Square(TRLMS)is proposed in order to solve the problem that the pulse interference near the service frequency band of aeronautical radio navigation affects the receiver,and further improve the ability of pulse interference suppression in the Global Navigation Satellite System(GNSS).By using the best wavelet function decomposition to track the frequency band of the positioning pulse interference,and adopting TRLMS adaptive filtering instead of the conventional fixed threshold method of wavelet packet,the interference is suppressed.The simulation results show that the mean square error of the proposed method is smaller than that of other methods.It solves the problem of useful signal loss and has better interference suppression performance.