Research on submarine signal detection method based on Welch algorithm

摘要

Based on the periodic graph method and Welch algorithm in classical power spectrum analysis, MATLAB is used as the simulation platform to simulate the submarine's commonly used modulation signals using the period graph method and the Welch algorithm. The results show that the Welch algorithm introduces the method of data segmentation overlap and windowing function, so it can achieve better variance performance and spectral resolution than the periodic graph method. At the same time, the 2FSK signals are simulated and analyzed by using different window functions and overlapping points. The results show that the Hamming window and Blackman window are more suitable for spectral estimation of signals, and the appropriate increase of overlapping points can improve the variance performance and resolution. The effectiveness of the proposed method under low SNR conditions is verified.