摘要
为了给移动或分布式目标提供有效的保护,提出了一种基于运动干扰机的SAR二维移频压制干扰方法。在波束照射范围内,运动干扰机在待保护目标附近截获SAR发射信号,并根据目标在距离向的范围与位置对其调制一个线性调频信号后转发。根据Range-Doppler算法,推导了距离向失配干扰信号脉冲压缩输出的主瓣位置、幅度以及宽度;分析了由于干扰机的运动导致的方位向调制信号,给出了干扰机起始位置、运动速度与方位向脉冲压缩输出主瓣位置、幅度以及主瓣展宽量的关系。理论研究表明,干扰信号能够在SAR图像中形成面状压制区,可以实现对移动或分布式目标的有效保护。仿真实验验证了该方法的有效性。
A two dimensional （2- D ） frequency- shift suppressed jamming method for synthetic aperture radar （ SAR ） is proposed in this paper for protecting the moving or distributed targets. In the beam illuminated area, the jammer is moving around the protected target to intercept the signal transmitted by SAR. It modulates a chirp signal rapid- ly, then amplifies and retransmits the modulated signal to SAR. According to the Range-Doppler algorithm, this paper derives the output expression of the range and azimuth jamming signal, and analyzes the relationship be- tween the mismatched signals which are caused by modulated parameters and the moving velocity of jammer, and the location, amplitude, width of the pulse compression output. Theoretical analysis indicates that the mismatched jamming signal can produce a fiat shape false target suppressed jamming area so as to achieve effective protection of the distributed target or the moving target. The simulation results verify the validity of this method.
出处
《电讯技术》
北大核心
2013年第4期383-388,共6页
Telecommunication Engineering
关键词
合成孔径雷达
运动干扰机
脉压失配
压制干扰
synthetic aperture radar
moving jammer
pulse compression mismatching
suppressed jamming
