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本文叙述了自适应滤波线路增强器的基本原理及其在从宽带信号中滤除窄带干扰方面的应用。自适应数字滤波器通过使一组滤波加权动态地适应信号的特征来处理被采样的数字信号。自适应滤波线路增强器根据这些加权的相关时间的不同,使这些加权自适应于从宽带信号中分离出窄带干扰。以非递归或递归两种形式构成的滤波器分别称作有限脉冲响应(FIR)滤波器和无限脉冲响应(IIR)滤波器。为了计算最佳的一组加权,已经研究出一种新算法,称为可变阶跃(VS)算法。本文示出了VS算法的计算机模拟结果并将它与使用样机所测得的结果加以比较。这些测试结果表明:对于脉动正弦波或其他频率捷变干扰那样的非平稳窄带干扰,这种自适应滤波器具有极好的跟踪特性。
This paper describes the basic principle of adaptive filter line enhancer and its application in filtering narrowband interference from wideband signal. An adaptive digital filter processes the sampled digital signal by dynamically adapting a set of filter weights to the characteristics of the signal. The adaptive filter line enhancer adapts these weights to separate narrowband interference from the wideband signal based on these weighted correlation times. Filters constructed in either non-recursive or recursive form are referred to as finite impulse response (FIR) filters and infinite impulse response (IIR) filters, respectively. In order to calculate the best set of weights, a new algorithm has been developed called a variable step (VS) algorithm. This article shows the computer simulation of the VS algorithm and compares it with the results obtained using the prototype. These test results show that this adaptive filter has excellent tracking characteristics for non-stationary narrow-band interference like pulsating sine waves or other frequency-agile interferences.