Design of Multi-carrier Phase-coded Waveform Based on Chaotic Modulation

Facing the continuously enhanced electromagnetic suppression methods and the consistent improvement of enemy reconnaissance system capabilities, the low probability of intercept performance of radar system has become one of the key indicators affecting its battlefield survivability. Traditional radar waveforms, due to their fixed modulation methods and easily extractable features, often face considerable risks when countering advanced electronic reconnaissance equipment. Therefore, composite modulation waveforms with high randomness and high complexity are gradually becoming an important research direction for improving radar anti-interception capabilities. In this paper a multi-carrier phase-coded waveform based on chaotic modulation is investigated. By using Logistic chaotic sequences to modulate the phases of multi-carrier phase-coded signals, it combines the un-predictabilities of the chaotic sequences with the structural flexibilities of multi-carrier codes. While maintaining the radar signal′s bandwidth, range, and velocity resolution, the waveform exhibits stronger randomness and complexity in terms of time-frequency characteristics, modulation structure, and spectral distribution, thereby significantly enhancing signal concealment and low probability of intercept. The proposed method provides a promising technical approach for the design of next-generation low probability of intercept radar waveforms.