Research on countermeasures against interrupted sampling repeater jamming
Deping Zhang, Yang Li, Junji Chen, Jian Qiu · 2025
Interrupted sampling repeater jamming (ISRJ), as an innovative manifestation of coherent interference, has demonstrated its effectiveness in disrupting radar systems utilizing linear frequency modulated signals through main lobe deception. In response to this significant threat, this study conducts a theoretical analysis of ISRJ principles and establishes a universal model applicable to diverse signal forms. Subsequently, from the perspectives of signal processing, system operation mode, and collaborative system design, this study devises countermeasure methods against interference including bi-phase coding/slope-agility special waveform scheduling, slope diversity, and external information support. Through simulation validation, the efficacy of each method is verified, and ultimately, a comprehensive anti-interference strategy emerges from the integration of distinctive attributes of each countermeasure method. The proposed method fully utilizes the radar's firststrike advantage and systematic capability in interference counteraction, without the need to change the existing radar's signal processing architecture. It features good anti-interference performance, robust real-time performance, and low complexity without requiring prior interference parameters.