Abstract
The hybrid waveform of linear frequency modulation and binary phase shift keying (LFM-BPSK) can take advantages of the LFM and BPSK signals, and reduce the defects of them. However, with the development of interception technology for the LFM-BPSK signal, the application of the signal is limited. In this paper, to improve the anti-interception performance of the hybrid waveform, a new waveform of LFM-BPSK with the varying chirp rate (denoted as VCR-LFM-BPSK) is designed. In this design, based on the working principle of the interception frame for the LFM-BPSK signal, different chirp rates are introduced in different sub-pulses to prevent the signal from being intercepted by the frame. Then, to further improve the anti-interception performance of the VCR-LFM-BPSK signal, the chirp rates are optimized by minimizing the interception capability of the interceptor. Moreover, based on the VCR-LFM-BPSK signal with the optimized chirp rates, the binary phases are designed via a multi-objective Pareto optimization to improve the capabilities of auto-correlation and spectrum. Simulation results demonstrate that the designed VCR-LFM-BPSK signal outperforms the traditional LFM-BPSK signal in countering the advanced interception technologies.
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