Morse Telegraph Detection and Demodulation Algorithm Research Based on Wavelet Transform and Clustering
Su Zhijin, Niu Hai, Zhuang Jiaping, Yang Qingchuan · 2019 IEEE 2nd International Conference on Automation, Electronics and Electrical Engineering (AUTEEE) · 2019
Morse telegraph is an important communication mode for emergency communication, which is ancient and vital, and it is of great significance to realize its demodulation. In this paper, Morse signal is detected by the short-time Fourier transform on the main frequency points. After taking the wavelet transform of the signal, the beginning and the end of the Morse code points and dashes are accurately estimated by the local extreme detection method, and the length distribution of the pulse and interval are calculated. The method of clustering is used to classify the points, dashes and different intervals, and then the telegram is decoded according to Morse code coding rules. Experiments proves that this method has certain anti-noise performance, and it can detect and decode Morse telegraph under the condition of high signal noise.