半实物射频仿真的误差联合概率密度函数分析

为了更详尽地描述仿真误差, 对基于三元组的半实物射频仿真的仿真角度误差二维联合概率密度函数(probability density function, PDF)进行了详细研究, 给出了仿真误差的方向性分布。基于重心公式, 在设定馈电幅度相对误差满足高斯分布的基础上, 给出了两个角度方向上的仿真角度误差的联合PDF。结果表明, 三元组对不同方向处的点目标的仿真误差二维联合PDF存在差异; 两个角度方向上的仿真角度误差会存在相关性, 且该相关性会随点目标位置的不同而不同。由于平行于航迹方向与垂直于航迹方向的角度误差对系统的影响不同, 该工作有利于对于半实物射频仿真的等效性进行更精细的评估。

Analysis of the joint PDF of the simulation error in the radio frequency simulation system

In order to describe the simulation error in more detail, the two-dimensional joint probability density function (PDF) of simulation angle error of hardware in the loop radio frequency simulation based on triples is studied in detail, and the directional distribution of simulation error is given. Based on the center of gravity formula, the joint PDF of simulation angle error in two angular directions is given on the basis that the relative error of feed amplitude satisfies Gaussian distribution. The results show that the two-dimensional joint PDF has different simulation errors for point targets in different directions. The simulation angle errors in the two angular directions will have correlation, and the correlation will vary with the position of the point target. Because the angle errors parallel to and perpendicular to the track have different effects on the system, this work is conducive to a more detailed evaluation of the equivalence of hardware in the radio frequency simulation.