Clutter suppression and target energy focussing for airborne rotating antenna radar using improved Space‐time adaptive processing
Clutter suppression and target energy focussing for airborne rotating antenna radar using improved Space‐time adaptive processing
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DOI：
10.1049/rsn2.12353
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Lichao Zhou;Yifeng Wu;Xiaobo Deng;Lei Zhang;Jianxin Wu;Qiang Zhang;Jia Duan
中科院分区：
文献类型：
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作者：
Lichao Zhou;Yifeng Wu;Xiaobo Deng;Lei Zhang;Jianxin Wu;Qiang Zhang;Jia Duan
旋转天线雷达广泛应用于机载平台，以扩大雷达探测空域的范围。然而，机载旋转雷达接收到的回波信号由于平台运动和天线旋转而在多普勒域扩散。在长时间积分过程中，天线旋转会影响信号的信噪比，降低传统处理方法对目标的检测性能。尽管传统的时空自适应处理（STAP）已经成功地用于抑制机载雷达上的杂波，但它没有考虑天线旋转。它降低了机载旋转天线雷达的杂波抑制性能。分析了机载旋转天线雷达的信号模型，对旋转天线场景下的STAP技术进行了改进，有效地抑制了杂波并对目标能量进行了聚焦。首先，对机载旋转天线雷达回波进行建模。其次，研究了影响阵元多普勒差的因素。再次，提出了一种改进的STAP方法。最后，研究了天线旋转对杂波多普勒特性的影响，以及改进STAP技术对杂波抑制和目标能量的影响。实验结果证明了该方法的有效性。
Rotating antenna radar is widely used on the airborne platform to extend the range of the radar detection airspace. However, the echo signal received by an airborne rotating radar is spread in the Doppler domain due to the platform motion and the antenna rotation. In the process of a long‐time integration, the antenna rotation harms the signal‐to‐noise ratio and reduces the performance of target detection when using conventional processing methods. Although conventional space‐time adaptive processing (STAP) has been used successfully to suppress clutter on an airborne radar, it does not take into account the antenna rotation. It decreases the performance of clutter suppression on the airborne rotating antenna radar. The signal model of airborne rotating antenna radar is analysed and the STAP technique to the rotating antenna scenario is improved to effectively suppress clutter and focus on target energy. Firstly, the echo of the airborne rotating antenna radar is modelled. Secondly, the factors affecting the Doppler difference of the array elements are investigated. Thirdly, an improved STAP method is proposed. Finally, the effect of antenna rotation on clutter Doppler characteristics and the clutter suppression and target energy focussing on the effects of the improved STAP technique are investigated. Experimental results demonstrate the effectiveness of the proposed method.