不同运动状态下的飞机目标雷达散射截面积统计特性分析

Radar cross section statistical characteristic of aircraft in different movement state

目标的运动状态对其动态雷达散射截面积(RCS)起伏特性具有十分重要的影响,同一目标在不同运动状态下,可能具有不同的RCS起伏模型。结合实测数据,对在平稳直线飞行和曲线机动飞行两种状态下的飞机动态RCS进行统计分析。分析结果表明:在平稳直线飞行状态下,飞机目标的动态RCS起伏模型与观测视角内的静态RCS起伏模型近似;在曲线机动飞行状态下,飞机目标的动态RCS起伏更显著、更随机,当观测时间足够长、目标的运动随机性更大时,其起伏模型更接近于指数分布。

The statistical characteristic of an aircraft's dynamic radar cross section(RCS)is affected by its movement state greatly.The same aircraft in different flying state presents different RCS statistical model.In this paper,the RCS obtained from the surveying radar is analyzed in both states of straight level stable flying and maneuvering flying.The analysis shows that the statistical characteristics of dynamic RCS of the two flight states are different.The statistical characteristic of dynamic RCS of the aircraft that fly straightly and level stably is approximately the same as static RCS.The fluctuant characteristic of dynamic RCS of the aircraft in the state of maneuvering flight is remarkable and stochastic.As the measurement time is long enough,the statistical characteristic of dynamic RCS of the aircraft in the state of maneuvering flight is more close to exponential distribution.