一种稳健的机载非正侧视阵雷达杂波抑制方法

A Robust Clutter Suppression Method for Airborne Non-sidelooking Radar

非正侧视阵列构型会导致机载雷达回波数据非均匀,从而严重削弱传统空时自适应处理算法的杂波抑制性能。针对此问题,该文提出一种对阵元误差稳健的非均匀杂波抑制方法。该方法首先根据雷达系统参数等先验信息构造杂波表示基;然后在考虑阵元误差下对待检测单元数据进行迭代的最小二乘拟合,文中推导出了该问题的闭式解;最后对拟合后的剩余数据进行脉冲多普勒处理以及恒虚警检测。该方法不需要训练样本,且能够在没有俯仰自由度的情况下对机载非正侧视阵雷达的非均匀杂波进行有效抑制。仿真结果验证了该方法的有效性。

Non-sidelooking array configuration leads to heterogeneous airborne radar echo data, it degrades seriously the clutter suppression performance of the traditional Space-Time Adaptive Processing （STAP） algorithms. To solve this problem, a heterogeneous clutter suppression method, which is robust to array error, is proposed. Firstly, a clutter representation basis is constructed based on a priori information such as system parameters. Then, the test data is fitted in an iterative least square manner with consideration of array error, and the closed-form solution is derived and utilized here. Finally, pulse Doppler processing and constant false alarm detection are conducted on the residual data. The proposed method does not need any training sample and can effectively suppress the heterogeneous clutter for airborne non-sidelooking radar without elevation degree of freedom. Simulation results verify the validity of the proposed method.