抗间歇采样转发干扰的认知恒模波形设计方法

Cognitive constant modulus waveform design method against interrupted sampling repeater jamming

间歇采样转发干扰(interrupted sampling repeater jamming,ISRJ)是一种相干干扰,对雷达信号的干扰效果表现为欺骗性。针对ISRJ匹配滤波后形成的高栅瓣问题,研究了低集成旁瓣电平(integrated sidelobe level,ISL)的波形设计方法。考虑到雷达发射信号的恒模约束,以最小化ISL为目标函数建立优化问题,由于该问题包含非凸四阶目标函数和非凸约束,难以得到闭式解,因此设计了一种加速优化极小化(majorization-minimization,MM)方法进行求解。最后,通过仿真实验和已有算法进行对比,验证了所设计的波形能降低干扰栅瓣,有效对抗ISRJ。

Interrupted sampling repeater jamming(ISRJ)is a kind of coherent interference and its effect on radar signals is deceptive.TOsolve the high grating lobe problem formed by ISRJ through matched filtering,the waveform design method of low integrated sidelobe level(ISL)is studied.Considering the constant modulus constraint of the radar transmitting signal,the optimization problem is established by minimizing ISL as the objective function.Since the problem involves a nonconvex fourth-order objective and a nonconvex constraint,it is difficult to obtain a closed-form solution.Therefore,an accelerated majorization-minimization(MM)method is designed to solve the problem.Finally,compared with the existing algorithm,the simulation results show that the waveform designed can reduce the jamming’s grating lobes and counter ISRJ effectively.