摘要
本文介绍了利用三元传感器阵抵消反射波干扰的新方法。推导了抵消反射干扰后提取直达信号的表达式:讨论了阵元间距的选择,给出了阵元间距与出现方程无解的频率点之间的关系,给出了当直达信号是带限信号时的阵元间距应满足的条件。理论分析及仿真结果表明:1.只要知道信号的到达方向,就可以从基阵的接收信号中完全消除反射波的干扰:2.阵元间距必须小于信号上限频率对应的半波长:3.该方法的优点是可以消除未知传播方向的反射干扰。
Principles of reflection suppression are presented by a three-sensor array in this paper. The formulae of extracting desired signals from reflection are derived. The selection of spacing between sensors is discussed and then relationships between the spacing and frequency point, at which the signals can be extracted, are given. When desired signals are band-limit, the conditions of the selected sensor spacing, which should be satisfied, are given. The theoretical and simulation results show that reflection which arriving direction is unknown can be completely cancelled without any information expect for the arriving direction of signals, that the spacing between sensors should be smaller than half wave length of upper limit frequency when the expected signals are band-limit.
出处
《信号处理》
CSCD
2001年第4期329-334,共6页
Journal of Signal Processing
关键词
三元阵
反射波
干扰抵消
阵元间距
信号处理
Three-sensor array Reflection Interference suppression Spacing between adjacent sensors