机载前视FDA-MIMO雷达距离模糊杂波抑制

高重复频率的前视阵雷达杂波存在距离依赖问题和距离模糊问题，导致传统的空时自适应处理方法杂波抑制性能急剧下降甚至失效。针对前视阵雷达距离模糊杂波抑制问题，利用频控阵（FDA）-多输入多输出（MIMO）体制提供的可控自由度，本文提出了一种距离模糊杂波抑制方法。该方法将无模糊区域和模糊区域的杂波在空间频率域上分离，利用俯仰角正切值导数更新（Tangent DBU，TDBU）的方法，对前视阵条件下的距离依赖性进行补偿，最后进行空时自适应信号处理。该方法有效解决了前视阵雷达距离模糊杂波抑制问题，提高了杂波抑制性能，仿真实验验证了本文方法的有效性。 

Range-ambiguous Clutter Suppression for Forward-looking FDA-MIMO Radar

? ?In a high pulse-repetitive-frequency forward-looking array radar， the clutter is not only range-dependent but also range-ambiguous， which leads to a sharp drop in the clutter suppression performance of the traditional space-time adaptive processing method or even failure. Focusing on the range-ambiguous clutter suppression problem of forward-looking array radar， this paper proposes a range-ambiguous clutter suppression method using the controllable degree-of-freedom provided by the FDA-MIMO radar. This method separates the clutter in the unambiguous area and the ambiguous area in the spatial frequency domain， and uses the method of Tangent Derivative Based Updating （Tangent DBU， TDBU） to compensate for the range-dependence under the condition of the forward-looking array. Finally， space-time adaptive signal processing is performed. This method effectively solves the problem of range-ambiguous clutter suppression for forward-looking array radar， and improves the clutter suppression performance. Simulation results demonstrate the effectiveness of proposed method.