基于艇载平台的空中运动目标探测在低空侦察、预警识别等军事领域的应用价值广泛。文中基于频分信号和孔径综合方式设计了一种艇载共形稀疏阵列布设方式。为降低阵列系统复杂度、提高数据利用率,采用主动冗余线列阵作为稀疏布设准则。提出了一种干涉处理的频域运动目标稀疏成像算法,利用飞艇悬浮的特点,对飞艇平台前后不同孔径综合下的实孔径雷达图像进行干涉操作,去除复图像分辨单元内的随机初相位,使雷达复图像在频域具备稀疏性质。在频域开展低通滤波等重构处理,可得到运动目标的稀疏重建结果,实现运动目标的准确探测。给出了艇载稀疏阵列在成像分辨率0.5 m的点阵目标成像仿真结果,验证了方法的有效性。

Air moving target detection based on airship platform has broad application prospects in low altitude reconnaissance, regional early warning and other military fields. An airship conformal sparse array based on orthogonal frequency division signal and aperture synthesis is designed. In order to reduce the complexity of array system and improve the utilization of data, the active redundant line array is used as sparse array criterion. An interferometric sparse imaging algorithm of moving targets in frequency domain is proposed. With suspension characteristics of the airship, the interferometric operation is performed on the realaperture radar images under the synthesis of different apertures before and after the airship platform, and the random initial phase in the complex image resolution unit is removed, so that the radar complex images are sparse in the frequency domain. Carrying out reconstruction processing like low-pass filtering in the frequency domain, sparse reconstruction results of moving objects can be gotten, and accurate detection of moving objects can be achieved. The imaging simulation results of airship sparse array with imaging resolution of 0.5 m are given, which verify the effectiveness of the method.

TN959.74