The principle of the cancellation of active stealth by phased antenna arrays is presented , together with the definition and the typical values of cancellaty , which is an important parameter to measure the stealth effects 提出了用相控陣法實現(xiàn)對消式有源隱身的原理方案。定義了一種衡量隱身效果的重要參數(shù)? ?對消度,給出了其表達式和典型值。