For the active jamming, the qualitative charac-teristies are represented by its radiation power, and for the passive jamm-ing, they are represented by the mean desity of the volume of the chaffcloud.

• 对有源干扰来说用有源干扰的辐射功率,对无源干扰来说用金属偶极子云的平均体密度作为抗干扰准则的定量特性。