| Popis: |
Many jamming methods have been proposed against displaced phase center antenna (DPCA) process, which is a type of three-channel synthetic aperture radar (SAR) ground moving target indication. However, two important problems faced by the jammer are why the jamming based on a single jammer is suppressed and how to generate noise in the whole DPCA image while keeping its easy realization. By analyzing a jamming geometric model based on a single jammer, the reason is that the phase of the jamming image in different antennas is only relative to the jamming geometric model, which contains the azimuth position of the jammer and jamming in the SAR image. Then, the jamming area is classified as an enhanced area and a weakened area after DPCA processing. Moreover, the jamming in the weakened area will be suppressed. To overcome this disadvantage, a barrage noise jamming method based on double jammers is proposed. By controlling the azimuth distance between the jammers, the noise can cover the whole DPCA image. Compared with the deception jamming method based on multiple coherent jammers, the phase and amplitude of the jamming signal do not need to be accurately controlled. Finally, the validity of the proposed method is verified by simulation experiments. |
