CAJ | 학술논문

针对 UHF 波段运动目标检测中信号弱、杂波展宽严重等问题，提出一种基于子孔径SAR 技术的杂波抑制方法。首先通过 SAR 成像实现运动目标的粗聚焦，再通过距离-方位拓展局部STAP 实现杂波抑制，避免了运动目标越距离单元和方位散焦带来的信号损失。最后，通过仿真结果验证了算法的有效性。
침대 UHF 파단운동목표검측중신호약、잡파전관엄중등문제，제출일충기우자공경SAR 기술적잡파억제방법。수선통과 SAR 성상실현운동목표적조취초，재통과거리-방위탁전국부STAP 실현잡파억제，피면료운동목표월거리단원화방위산초대래적신호손실。최후，통과방진결과험증료산법적유효성。
In the Ultra-High Frequency (UHF) band Synthetic Aperture Radar/Ground Moving Target Indication (SAR/GMTI) system, the signal of moving target is weak, while the clutter is widely spread in the Doppler field. So it is difficult to indicate the moving targets, especially the slower ones. In this paper, a clutter suppression method is proposed, which is based on the sub-aperture SAR. In this method, firstly, the moving target is roughly focused. Then the clutter is suppressed through the local space-time adaptive processing (STAP), which is formulated by extending in range and azimuth. With the extension, the losses of the signal due to range cell walk and the de-focusing in azimuth are both avoided. Finally, the method is validated trough simulation.