利用阵列天线合成孔径雷达技术能够实现目标三维成像。对于天基雷达,通过对天线进行稀疏化,在空间分辨率要求高、设备体积质量约束条件多的工作环境中具有显著优势。在此基础上,文中进一步开展稀疏阵列天基雷达运动目标探测方法的研究,基于在交轨向应用大型稀疏线阵、顺轨向采用合成孔径技术、距离向发射线性调频信号的工作机制,提出对获取的回波信号分别进行修正均匀冗余阵列正反编码空间调制和干涉处理来实现运动目标探测。仿真表明:相比于直接三维成像结果,应用文中方法得到的三维图像分辨率虽然有所降低,但是能够有效地实现运动目标的探测。

Three-dimensional imaging of target can be realized by using array antenna synthetic aperture radar technology. As for space-based radar system, it can obtain significant advantages in the working environment with high spatial resolution and constrains on the volume and weight by thinning the antennas. On the basis of the above, a moving target detection method for sparse array space-based radar is researched. Based on the working mechanism of applying large sparse linear array in the cross orbit direction, using synthetic aperture technology in the along orbit direction and transmitting linear frequency modulation signal in the range direction, the moving target detection is realized by using positive and negative coding space modulation and interference processing of modified uniformly redundant arrays to obtained echo signal. The proposed approach is verified by the simulations, which demonstrate that the moving target can be detected better in spite of the resolution being reduced compared to the result of the direct three-dimensional imaging processing.

TN957.51