CAJ | 학술논문

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。
침대전통측향산법대단시신호측향성능차적문제,제출료일충기우단시부리협변환（Short-time Fourier Transform,STFT）적빈역처리여신호공솔문한적자동판결상결합적측향기술,재제거간우신호적동시제취목표신호적유효신식,연후이용측향산법진행측향。급출료해산법적구체실현과정,병대산법진행료방진분석,험증기가행성,동시급출료방진결과병지출료산법적우점여불족。
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.