姿态扰动情况下的目标动态RCS分布特性

Dynamic target RCS characteristic analysis under the influence of attitude perturbation

运动目标姿态扰动是静动态雷达散射截面(radar cross section,RCS)差异的主要来源。造成姿态扰动的因素复杂且不可预估,增加了动态RCS分布特性研究的难度。将图形电磁计算与蒙特卡罗仿真结合,构建以均匀随机分布为扰动模型的动态RCS仿真分析平台。根据静动态RCS差异的统计分布特性,提出置信区间以及数学期望值的计算方法。选择两种运动模式下的飞机目标进行验证,将所得结果与实际扰动模型的动态RCS进行了比对。结论表明该方法具备较强可操作性和工程应用价值,提高了计算机动态RCS仿真能力,为目标静动态电磁散射特性一致性评估以及特征库构建提供了有价值的参考信息和分析方法。

Attitude perturbation of the dynamic radar target is the major cause in radar cross secuon （RCS） differences between static and dynamic systems. The perturbation factors are usually complicated and unpredic- table, which aggravate the difficulty of target dynamic RCS characteristic research. A simulation platform based on the combination of graphical electromagnetic computing （GRECO） and Monte Carlo simulation methods is proposed, which uses random variables with uniform distribution to model the attitude perturbation. The con- cept and computation methods of dynamic RCS credibility zone and expected value are demonstrated according to the pattern of RCS differences between quasi-static and perturbed attitudes. The aircraft with two kinds of mo- tion models is taken to validate the proposed platform. Simulation results are compared with the one from the practical attitude perturbation model. Conclusions validate the feasibility of the proposed method, which en- hances the simulation capability of GRECO and provides the effective solution to the target electromagnetic scat- tering cha-racteristic data consistency evaluation in addition to the attitude sensitivity analysis.