Abstract: ObjectivesTo address the problem of large differences in the number and amplitude of false targets generated by different modulated parameters in time-modulated smart jamming technology, the jamming effects of different modulation parameter are analyzed, and the jamming effectiveness is evaluated with simulation and experiment. Methods By establishing a jamming theoretical model for linear frequency modulated pulse radar using different modulation modules, the mapping relationship between modulation timing sequence and false target amplitude is clarified, thereby achieving the effectiveness evaluation. At the same time, a set of Ku-band smart jamming system including 1bit modulated and control module is designed and measured to verify the effectiveness.Results Numerical simulation verifies the effectiveness of the evaluation method, and the experimental results verify the strong correlation between the duty cycle of modulated pulse and jamming effectiveness. Conclusions The proposed evaluation method achieves the evaluation of jamming effectiveness in a qualitative and quantitative manner, which has important guiding significance for the application of time-modulated smart jamming technology.