高速移动体表面的二次辐射分析

Analysis of the secondary radiation on high-speed moving target

从理论上分析了入射到高速列车车体上的垂直极化平面波在车体上产生的二次辐射场.利用爱因斯坦相对论和正反2次洛伦兹变换,得到了经过列车体的反射波解析式、二次辐射场的频率和反射角等参数.反射波频率和反射角不再遵守反射定律,而是与速度、入射角和方位角有关的函数.当y方向速度大于或等于0时,反射角均小于或等于入射角;y方向速度小于0时,反射角则大于入射角.随着入射角的增大,反射频率和入射频率之间的差距越来越大;随着y方向速度的增大,两者之差也逐渐增大.最后通过仿真计算和实测数据验证了理论分析的正确性.

The analysis of the secondary radiation on a uniformly perfect conducting high-speed target in an arbitrary direction was concerned. The reflection wave analytical formula by train, frequency of the second-order radiation, and reflection angle were obtained by using twice Lorentz transformation. It is also shown that the reflection frequency and reflection angle of reflected wave depend on the speed, incident and azimuth angles of incident wave. And all the reflection angles are smaller than the related incident angles when y-axis speed greater than O, but bigger than the related incident angles if y-axis speed less than O. Besides, the reflection angle shift becomes larger with the increase of the in- cident angle, the reflection angle also becomes bigger and bigger. At last, the analysis results were verified by the calculation and the measured near Shanghai maglev train.