基于极化单脉冲雷达扩展目标角度估计方法

当单脉冲雷达受到箔条质心干扰时, 将视为波束内存在两个不可分辨的目标, 由于目标和箔条干扰回波混叠耦合, 导致单脉冲测角偏差, 最终致使目标跟踪丢失。对此, 利用宽带单脉冲雷达测角精度高的优点和极化信息, 提出一种基于极化单脉冲雷达的扩展目标角度估计方法。首先，分析宽带单脉冲雷达体制下箔条质心干扰的特点, 给出扩展目标双极化和差信号模型。然后, 根据和、差通道极化回波信号, 通过联立方程组, 估计出目标和箔条干扰的到达角(angle of arrival, AOA), 为后续利用目标角度信息跟踪目标提供条件。最后，通过蒙特卡罗仿真实验分析关键参数对目标角度估计性能的影响, 并与传统单脉冲雷达体制的测角方法进行比较。理论分析和仿真实验表明, 在质心干扰条件下, 宽带单脉冲雷达估计目标AOA的性能要优于传统单脉冲雷达。

Angle estimation method of extended target based on polarization monopulse radar

When the chaff centroid jamming in monopulse radar is presented, it will be considered that two indistinguishable targets are in the beam. Due to the aliasing and coupling between the target and the jamming echo, the angle measurement deviation will be caused, and finally target tracking will be lost. In view of this situation, this paper takes advantage of the high accuracy of wideband monopulse radar angle measurement and uses the polarization information to propose a method for estimating the angle of extended targets based on polarization monopulse radar. Firstly, the characteristics of chaff centroid jamming in wideband monopulse radar system are analyzed, and the dual polarization sum and difference signal model of the extended targets is given. And then, the angle of arrival (AOA) of target and chaff jamming is estimated according to the polarization echo signal of sum and difference channel through simultaneous equations, which provides conditions for tracking the target with the angle information of the target. Finally, the influence of some key parameters on the performance of target angle estimation is analyzed by the Monte Carlo simulation experiment, and compared with the traditional monopulse radar angle measurement method. Theoretical analysis and simulation results show that the performance of AOA estimation for wideband monopulse radar is better than that of traditional monopulse radar under chaff centroid jamming.