Design of Non-uniform Frequency-Phase Hybrid Modulation Radar Waveform and Segmented Complementary Mismatch Filtering

With the development of electronic countermeasures, radar systems need to embrace innovative modulation techniques to enhance signal intricacy and bolster counter-interception capabilities. The time width and bandwidth of the code of the existing conventional frequency-phase hybrid modulation signal are constant, and the range sidelobe level is relatively high. This paper approaches the aforementioned problems from two perspectives: optimizing the transmission signal and processing hybrid modulated signal. Firstly, a novel approach is introduced involving non-uniform frequency-phase hybrid modulation radar signal. The signal is optimized by using the principle of coordinate descent and cost function diversity. Secondly, to further mitigate the impact of range sidelobes on target observation, an intrapulse segmented complementary mismatch filtering technique is proposed, built upon the foundation of hybrid modulated signal. Notably, the influence of actual Doppler frequency shifts is taken into account. Finally, the effectiveness of the algorithm is verified through simulation. Compared to conventional interpulse complementary mismatch filtering, the hybrid signal and processing techniques presented in this paper lead to reduced signal processing times and the realization of range sidelobe suppression for moving targets.