阵列雷达双零点单脉冲低角跟踪算法

针对阵列雷达体制，从改进单脉冲的角度出发研究了低角跟踪问题。在多径阵列信号模型的基础上，利用极大似然估计原理推导了双零点单脉冲测角算法，通过数字波束形成实现双零点单脉冲系统修正和、差方向图。仿真分析了双零点单脉冲测角性能，得出测角性能与信噪比、目标仰角以及复反射系数的关系。用实测数据对该算法进行验证，结果表明：当目标仰角小于1/4波束宽度时，测角均方根误差达到1/40波束宽度，可以有效解决低角跟踪问题。
According to array radar system, low-angle tracking problem was investigated from the perspective of revised mono-pulse. Firstly, based on the array signal model under multi-path conditions, the double-null mono-pulse algorithm was deduced by using the principle of Maximal Likelihood (ML) estimation. The revised sum-difference patterns were designed by digital beamforming (DBF). Simulation result shows the relation of double-null mono-pulse performance, SNR, target elevation, and complex reflection coefficient. Finally, measured data is used for validation. Result shows that the root of mean square error (RMSE) is still less than 1/40 of the beamwidth when the target elevation is less than 1/4 of the beamwidth. Therefore, the double-null mono-pulse algorithm is effective for low-angle tracking problem.