什么是RCS值

2025-02-26 08:11:12
推荐回答(2个)
回答1:

RCS值是雷达散射面积的值。

指的是目标辐射等效面积σ,等于目标总的后向散射功率P与雷达发射机在目标处的入射功率密度Q之比。

RCS:Radar Cross-Section(雷达散射截面积)雷达目标和散射的能量可以表示为一个有效面积和入射功率密度的乘积,这个面积通常称为雷达散射截面积。

扩展资料

雷达目标反射面积RCS可从电磁散射理论方面进行定义。定义为:单位立体角内目标朝接收方向散射的功率与从给定方向入射于该目标的平面波功率密度之比的4π倍。

不同性质、形状和分布的目标,其散射效率是不同的。为确定这一效率,我们把有效散射面积等效为一个各向同性反射体的截面积,称为目标的雷达截面积,写作σ ,其表达式为:

σ=4πA^2/λ^2 。式中:A 为照射面积, λ为工作波长。

目标的RCS取决于目标结构(形状和材料)、雷达工作频率、雷达极化方式和雷达观测角。通常情况下,平面目标具有较强的镜反射回波,而赋形、涂覆雷达吸波材料和采用非金属材料等隐身技术则可以大大降低目标雷达截面积。

参考资料来源:百度百科-RCS

回答2:

RCS值:Radar Cross Section,即雷达散射截面积(RCS),是评定和衡量一架隐身飞机的最重要的参数,它是目标的一种折算面积,用来度量目标在雷达波照射下所产生的回波强度大小,用σ表示。
确定雷达散射截面积,首先是通过测量或计算一个目标朝着观察者反射的雷达能量,然后,设
计师计算出可以返回同等雷达能量的反射球体(光学上的等效物可以是一个球面镜)的尺寸。这个球
体的投影面积(即圆的面积),就是该目标的雷达散射截面积。

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