Analysis on wave-front phase distortion characteristics based on NSGA-II.

The jamming method of multi-vector synthesis is recognized as one of the best means to combat tracking radar because lt can cause wave-front phase distortion. However, most of the researches analyze the jamming performance of multi-vector from the radar side, so we need to know the radar angle measurement system in advance. From the point of view of the jammer, this paper establishes the jamming scene of multi-vector synthesis, deduces the expression of amplitude and phase of the synthesized signal, and analyses the waveform characteristics of multi-vector synthesis. The parameters such as amplitude gain, phase shift and number of elements are optimized by the NSGA-II algorithm for the purpose of improving the two waveform characteristics of the degree of center distortion and the effective distortion region. The simulation results show that the wave-front phases are not the same for different numbers of elements. By increasing an appropriate number of elements, the degree of center distortion of synthetic waves can be effectively improved, and the jamming performance of the center point of the synthetic wave could be belter, but the influence on the effective distortion region is small. [ABSTRACT FROM AUTHOR]