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

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.