With the multi-function need for airborne space-time adaptive processing (STAP) radar, range synthesis is usually necessary for the follow-up function of target recognition. Utilising the excellent performance on orthogonality and bandwidth synthesis of the frequency division multiple access (FDMA) waveform and the longer accumulation time of multiple-input multiple-output (MIMO) radar, a robust low-sidelobe target synthesis method for airborne FDMA–MIMO STAP radar is developed. The spectra characteristics of target and clutter are first analysed. Then, the keystone transform is employed to mitigate velocity migration. To avoid gain fluctuation induced by multiple independent adaptive weight vectors, the robust STAP beamformer is developed. Finally, to decouple the range–angle coupling relationship resulted from the FDMA waveform, angle compensation is added in the robust STAP beamformer. Numerical examples are given to demonstrate the effectiveness of the presented method.

中文翻译：

---

机载FDMA–MIMO STAP雷达的鲁棒近距离旁瓣目标合成

随着机载空时自适应处理（STAP）雷达的多功能需求，通常需要对目标识别的跟踪功能进行距离综合。利用出色的频分多址（FDMA）波形正交性和带宽综合性能以及多输入多输出（MIMO）雷达的较长累积时间，一种机载FDMA–MIMO STAP的鲁棒低旁瓣目标综合方法雷达研制成功。首先分析了目标和杂波的光谱特性。然后，采用梯形失真变换来减轻速度偏移。为了避免由多个独立的自适应加权矢量引起的增益波动，开发了鲁棒的STAP波束形成器。最后，要解耦由FDMA波形产生的范围-角度耦合关系，坚固的STAP波束形成器中添加了角度补偿。数值例子说明了该方法的有效性。