基于多接收机协同的无源测向及SAR欺骗干扰方法研究

Study on passive direction-finding and SAR deception jamming method based on multi-receiver cooperation

对合成孔径雷达(synthetic aperture radar,SAR)实施欺骗干扰,干扰方通常需要预先侦察出SAR载机平台速度、方位向慢时间、SAR载机平台到干扰机的最近斜距以及干扰机自身位置等关键参数,而获取这些参数通常需要复杂的侦察设备。针对这一问题,提出了一种基于多接收机协同的无源测向及SAR欺骗干扰方法,利用干扰机和接收机的布站以及接收机间的到达时差(time difference of arrival,TDOA)信息,有效地解决了需复杂设备侦察上述关键参数的难题,简化了干扰系统的配置。根据TDOA信息,可计算出干扰机相对于SAR载机平台的俯仰角和水平方位角,从而实现对SAR载机平台的无源测向。在此基础上,提出了一种对SAR实施欺骗干扰的算法,并与现有基于多接收机协同的SAR欺骗干扰方法进行了对比。对比结果表明,随着生成的虚假目标距离干扰机的距离增大,所提方法比现有方法的目标聚焦效果更好,且实时性更强。

When the deception jamming is implemented on synthetic aperture radar(SAR),the jammer usually needs to obtain some key parameters in advance,such as the speed of carrier platform of SAR,the slow time of azimuth,the nearest oblique distance from the jammer to the carrier platform of SAR,and the self-position of the jammer,etc.However,the acquisition of these key parameters above usually needs complex reconnaissance equipments.In response to this problem,a passive direction-finding and SAR deception jamming method based on multi-receiver coondination is proposed in this paper.This method uses the arrangement of jammers and receivers and the time difference of arrival(TDOA)information between the receivers,and effectively solves the problem of the requirement for complex equipment to reconnoitre the above key parameters,and greatly simplifies the configuration of the interference system.According to the TDOA information,the pitch angle and horizontal azimuth of jammer relative to the carrier platform of SAR can be calculated,so as to realize the passive direction-finding of carrier platform of SAR.On this basis,a deception jamming algorithm against SAR is proposed and compared with the existing deception jamming algorithm against SAR based on multi-receiver coondination.The result shows that,with the increase of distance between the generated false target and the jammer,the false target focusing effect and real-time performance of the proposed method are better than that of the existing methods.