Parameters estimation of hybrid modulated signal combining BPSK and LFM Based on Born-Jordan Distribution

Abstract Aiming at the problem of estimation hybrid modulated signal combining Binary Phase Shift Keying and Linear Frequency Modulation (LFM-BPSK), existing methods have low accuracy in SNR. To solve this problem, algorithm based on Born-Jordan time-frequency distribution (BJD) is proposed, which uses Hough transform (HT) to estimate initial frequency chirp rate LFM-BPSK signal, then estimates code element width by dimensionality reduction time-domain signal. Finally, simulation experiments show that parameter proposed under SNR significantly better than algorithms, performance close MCRLB.