基于相位调制的雷达抗假目标干扰方法

针对欺骗式干扰难分辨和难去除的问题, 基于相参积累的原理, 提出一种基于相位调制(Phase Modulation, PM)的雷达抗假目标干扰方法。首先, 雷达发射相位调制的脉冲串信号, 之后根据相位的先验信息在接收时对回波信号进行相位补偿。然后,对回波信号进行脉冲压缩和相参积累, 在处理后形成的距离-多普勒图上对真、假目标进行分辨并提取出目标的多普勒频率。最后,结合自适应波束形成原理以及真实目标的多普勒频率信息, 设计自适应多普勒滤波器, 对回波脉冲串进行处理, 使真目标得到增强, 并在假目标的多普勒频率处形成零陷, 解决了假目标难去除的问题。仿真实验表明, 所提方法能有效分辨并去除回波信号中的假目标。

Radar anti-false target jamming method based on phase modulation

Aiming at the problem that deception jamming is difficult to distinguish and eliminate, based on the priciple of coherent accumulation, a method of radar anti-false target jamming based on phase modulation (PM) is proposed in this paper. Firstly, the radar transmits the phase modulated pulse train signal. Then, according to the prior information of the phase, the radar compensates the phase of the echo signal when it is received. secondly, the echo signal carries out pulse compression and coherent accumulation. After processing, the range-Doppler (R-D) diagram is used to distinguish the real and false target and extract the Doppler frequency of the real target. Finally, according to the adaptive beamforming theory and the Doppler frequency information of the real target, an adaptive Doppler filter is designed to process the echo pulse train to enhance the real target and form a null at the Doppler frequency of the false target. The problem that the false target is difficult to be eliminated is solved. Simulation results show that the proposed method can effectively distinguish and eliminate false targets in the echo signal.