Mainlobe deceptive jammer suppression is a critical issue for radar systems. To address this problem, the element-pulse coding (EPC) scheme is proposed in multiple-input multiple-output (MIMO) radar. In EPC-MIMO radar, a novel phase modulation is performed in the joint transmit element and pulse domain, resulting in an equivalent spatial frequency offset corresponding to different pulses. In such a way, the true target and mainlobe deceptive jammers, which are generated after a relatively large time delay, are distinguishable because they have different equivalent spatial distributions in the joint transmit-receive spatial frequency domain. In this respect, by selecting an appropriate coding coefficient, the mainlobe deceptive jammers can be suppressed by nulling at the equivalent transmit beampattern of the true target. Moreover, a preset beampattern synthesis (PBPS) method is proposed to enhance the robustness of jammer suppression against direction mismatches by broadening nulls around the jammers and generating a flat-top mainlobe. At the analysis stage, both simulated and measured results are provided to corroborate the effectiveness of the mainlobe deceptive jammer suppression with the developed methods.

主瓣欺骗性干扰抑制是雷达系统的关键问题。为了解决这个问题，在多输入多输出（MIMO）雷达中提出了元素脉冲编码（EPC）方案。在EPC-MIMO雷达中，在联合发射元件和脉冲域中执行了新颖的相位调制，从而产生了与不同脉冲相对应的等效空间频率偏移。以这种方式，在相对较大的时间延迟之后生成的真实目标和主瓣欺骗性干扰信号是可区分的，因为它们在联合发射-接收空间频域中具有不同的等效空间分布。在这方面，通过选择适当的编码系数，可以通过在真实目标的等效发射波束图上进行零陷来抑制主瓣欺骗性干扰。此外，提出了一种预先设定的波束图合成（PBPS）方法，以通过扩展干扰周围的零点并生成平顶主瓣来增强针对方向不匹配的干扰抑制的鲁棒性。在分析阶段，提供了仿真结果和测量结果，以验证所开发方法对主瓣欺骗性干扰抑制的有效性。