Analysis of active interference on terminal guidance radar interference

To investigate the effectiveness of active jamming against terminal guidance radar, this paper conducts theoretical modeling and analysis of the jamming capabilities. Firstly, based on the Linear Frequency Modulation (LFM) signal and Pulse-Doppler processing mechanism, models for the radar’s transmitted signal and the received target echo signal are established. Secondly, mathematical models for both barrage jamming and deception jamming are constructed, analyzing their respective mechanisms and limitations. Finally, jamming optimization is analyzed from three dimensions: polarization, time-frequency characteristics, and frequency agility. The study demonstrates that: (1) Dynamically maintaining the polarization mismatch angle within the range of 60°to 120°yields optimal jamming effectiveness; (2) Employing a "comb spectrum+random time delay" structure in the jamming signal makes it difficult for the radar to extract continuous features; (3) A jamming to radar agile bandwidth ratio greater than 1.2 is the critical threshold for jamming effectiveness. The results validate that regulating the polarization mismatch angle, matching time-frequency characteristics, and optimizing the agile bandwidth ratio are key pathways to enhancing jamming effectiveness.