相控阵雷达低仰角目标DOA估计的算法

在相控阵雷达跟踪低仰角目标时，采用频率捷变技术可以有效地减小雷达回波中直射信号和反射信号的相关性，抑制多径效应对目标到达方向估计造成的影响，提高角度估计的精度和性能。再用修正的AR模型算法，不仅可以在此基础上进一步去掉这两种信号的相关性，而且能正确估计出目标和镜像的仰角。计算机仿真实验结果验证了频率捷变和修正AR模型算法理论的正确性，以及在与其他方法比较的情况下，两者结合在去相关性能上的优越性和工程实用性。

It is very effective that applying frequency agility to reduce the coherence of the direct and the reflect signal in phased array radar, which are contained in the echo of radar. This method can restrain the influence caused by multipath effect when estimating the target’s direction of arrival (DOA), and improve the precision and ability of angle’s estimation. Then the application of the modified AR model can not only reduce the coherence of the two signals further, but separate the elevations of the target and its image. The simulation results verify the validity of the theory of frequency agility and modified AR model, as well as the advantage and practicability with the combination of two methods when comparing with other methods.