典型隐身飞机动态RCS 仿真及统计分析

非合作目标的动态RCS 数据难以通过外场测量获取,电磁仿真计算成为了获取其电磁动态特性的有效途径。基于全空域静态RCS 数据库和空气动力学原理对典型隐身飞机的动态RCS 进行了仿真,并采用姿态抖动模型修正了姿态角,使动态数据更加贴近实际情况。其次,分别采用卡方分布、对数正态分布和威布尔分布对动态RCS 进行统计建模, 非参数检验结果表明对数正态分布在不同频率、不同极化均能获得最佳拟合效果,体现出其在描述动态RCS 起伏特性方面具有通用性。研究成果可为实现雷达回波的快速精确仿真提供依据。

Statistical Analysis and Simulation of Typical Stealth Aircraft Dynamic RCS

Due to the difficulty of field measurement of dynamic RCS of non-cooperative target, it is advantageous to use the simulation method to calculate the dynamic scattering. The all-round dynamic RCS of typical stealth aircraft was simulated based on all airspace static RCS database and aerodynamics. The attitude angles were modified by vibration model to make simulated results coincide with actual situation. In addition, Statistical modeling of dynamic RCS by c2 distribution,Log-normal distribution and Weibull distribution was investigated. The goodness-of-fit test results show log-normal distribution is a universal distribution to describe the dynamic RCS on different frequencies and polarizations. The results of this paper can provide a support for fast and accurate simulation of target's echo.