实际工程中经常会遇到曲棱劈结构的雷达截面计算问题，文中利用几何绕射理论和二维雷达截面与三维雷达截面的关系，推导了这种结构雷达后向散射截面的计算公式，比较了不同极化下后向散射截面的差异，并对公式中关键参数进行了进一步的讨论。最后通过对导弹尾裙曲棱劈结构的理论值与实测值的比较，验证了这种方法的可行性。

Curved wedge is often met in reality. In this paper, a new method to calculate its RCS is given on the basis of GTD and the relationship between two dimensional RCS and three dimensional RCS. And the difference of RCS for different polarizations is considered. Furthermore, the key parameters in the method are discussed. The method is verified by comparison of calculated result with measure result of a curved wedge of a missile tail.

TN957.5