基于短时傅里叶变换测向技术  

Direction Finding Technology of Short-time Signals Based on Short-time Fourier Transform

作　　者：赵地[1] 王东营[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2011年第10期50-52,共3页Radio Engineering

摘　　要：针对传统测向算法对短时信号测向性能差的问题,提出了一种基于短时傅里叶变换(Short-time Fourier Transform,STFT)的频域处理与信号功率门限的自动判决相结合的测向技术,在除去干扰信号的同时提取目标信号的有效信息,然后利用测向算法进行测向。给出了该算法的具体实现过程,并对算法进行了仿真分析,验证其可行性,同时给出了仿真结果并指出了算法的优点与不足。To eliminate the deficiency of traditional algorithms in direction finding of short-time signals,a certain frequency domain processing algorithm based on Short-time Fourier Transform is used to perform a time-frequency analysis of certain signals in the paper.A method how to calculate the interference threshold based on the average power of the expected signals is put forward.Detecting the Short-time signals and judging the power threshold,some valid information can be extracted from the signal series,and meanwhile interference signals are undermined.A simulation by virtue of the algorithm of direction finding is done.The simulation result shows that this algorithm can effectively extract the short-time signal that varies dramatically with time.The feasibility of the method is proved,and some advantages and disadvantages are discussed in the end.

关 键 词：STFT 时频分析 门限判决 测向 

分 类 号：TN911[电子电信—通信与信息系统]