ZHENG Yang, CHEN Xi-hao, ZHU Rui, et al. Frequency hopping signals detection based on wavelet decomposition and HHT[J]. 2017, 36(9): 132-135. DOI: 10.13873/j.1000-9787(2017)09-0132-04.
The existing detection algorithm of frequency hopping( FH) signals based on the time-frequency analysis cannot satisfy the time and frequency resolutions requirements at the same time due to the influence of window function. In order to solve this problem
an algorithm based on wavelet decomposition and Hilbert-Huang transform( HHT) is proposed. The proposed algorithm removes the noise of the received signals by wavelet decomposition and detect the FH signals by HHT
so as to avoid influence of window function in process of time frequency analysis. Theoretical derivation simulation results show the proposed algorithm takes into account both the time resolution and the frequency resolution. So
the accuracy of FH signals detection can be improved obviously.
Mitigating end effects of EMD using non-equidistance grey model [J]. Zhi He 1 , Yi Shen 1,* , Qiang Wang 1 , Yan Wang 1 , Naizhang Feng 2 , and Liyong Ma 2 1. School of Astronautics, Harbin Institute of Technology, Harbin 150001, P. R. China; 2. School of Information and Electrical Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, P. R. China. Journal of Systems Engineering and Electronics . 2012(04)