飞机尾喷CO2浓度扩散场是飞机不可隐藏的目标特性之一,为间接探测飞机提供了可能。采用数值模拟方法对典型工况下简化飞机模型的尾喷CO2浓度扩散场进行了仿真,利用仿真数据模拟了激光雷达系统探测目标并获取CO2浓度分布的过程,对不同参数条件下激光探测系统的探测性能进行了仿真分析。结果表明,飞机尾喷CO2扩散具有可探测性；选择合适的激光发散角、扫描角间隔和空间积分距离可探测到飞机,且在参数组合(0.5 mrad,4.4°,20 m)和(5 mrad,4.4°,20 m)下计算得到CO2浓度扰动中心与设定目标间的距离为2.9 m。本研究可为实际应用提供参考。

The CO2 concentration diffusion field of aircraft plume is one of the target characteristics that the aircraft can’t hide, by which it’s possible to detect aircraft indirectly. With a simplified aircraft model, the numerical simulation method is used to simulate the CO2 concentration diffusion field of aircraft plume under typical working conditions. Then the process of detecting targets and obtaining CO2 concentration distribution by a lidar system is simulated with simulation results. And the detection performances of the laser detection system under different parameters is simulated and analyzed. The results show that the CO2 diffusion of the aircraft plume is detectable with appropriate laser divergence angle, scanning angle interval and space integral distance. The distance between the CO2 disturbance center and the preset target is 2.9 m when the combination of above parameters is 0.5 mrad, 4.4°, 20 m or 5 mrad, 4.4°, 20 m. This research may provide a reference for practical application.