飞机运动特征对动态RCS序列的影响分析

针对超音速隐身飞机难以探测的问题,仿真分析了F-22飞机在不同运动特征下的动态RCS,并对其频率响应和极化响应特性做进一步的研究。首先设定飞行航迹,并考虑实际中随机抖动的影响,获取时变的雷达视线姿态角;其次应用物理光学并结合等效电磁流的方法,计算分析了飞机以不同的速度沿不同航迹飞行时的动态RCS。对于使飞机动态RCS变化最明显的运动特征,仿真计算了其在不同频段、不同极化下的动态RCS。仿真结果表明:在不同航迹下,飞机速度对其动态RCS的影响程度不同,且当飞机沿小航路捷径低速或者高速飞行时,其RCS值减小最为明显,利用极化响应和频率响应特性可以有效地削弱这一影响。研究成果对于超音速隐身飞机目标的预警探测具有重要意义。

Analysis of the Impact of Aircraft Movement Feature on Dynamic RCS Series

To solve the problem of difficult detection for supersonic speed stealth target, the dynamic RCS of F-22 stealth aircraft at different movement feature is simulated and the further research on the frequency and polarization response characteristics is done in this paper. The flight tracks are set and the real-time angles of radar sight with random jitter are obtained. Subsequently,by using physical optics and method of equivalent currents,the dynamic RCS of different speed aircraft at different flight tracks is simulated and analyzed. As for the movement feature that has the biggest effect on the dynamic RCS,its dynamic RCS on different frequencies and polarizations is simulated. The simulation results show that the flying speed affects dynamic RCS differently at different flight tricks, and the RCS value is lowest when the aircraft flies at small course short-cut at lower or higher speed. By using the frequency and polarization response characteristics can weaken the influence efficiently. The results of this paper are of great significance to the early warning and detection of supersonic speed stealth aircraft.