Parameter Estimation Approach of 2FSK/BPSK Hybrid Signal Based on ZAM-GTFR
Bin Tang · Electronic Information Warfare Technology · 2011
To solve the problem of estimating the parameters of the hybrid signal combined by binary frequency shift-keying and binary phase shift-keying(2FSK/BPSK),an approach is presented based on the generalized time-frequency representation of Zhao,Atlas,and Marks(ZAM-GTFR) of 2FSK/BPSK signal.Firstly,the ZAM-GTFR of the received signal is presented,and the negative peaks reflecting the phase changes of BPSK are derived,then the code rate of BPSK is estimated by the fast Fourier transform of these peaks.Meanwhile,the frequency locations of the negative peaks and the ridge of ZAM-GTFR after discretization and difference are used to estimate the frequency and code rate of 2FSK.Simulations show that this approach has 90% accuracy when the signal to noise ratio(SNR) is greater than-1dB under the discussed signal model.