Abstract: The process of a UAV breaking through hostile air-defense system is presented，and the sensitivity of UAV influenced by SSJ in the process is analyzed，especially the effect of SSJ on various tache of sensitivity is researched.The smallest detection range，detection probability，miss distance and hit probability influenced by average interference power are simulated and the simulation result shows that the sensitivity of UAV can reduce greatly under the countermeasure support of SSJ，thus enhances its survivability on battlefield.The sample results show that those methods and processes provide some guidance for evaluating the sensitivity of UAV，enhancing its survivability and increasing the effectiveness of radar detection system.

Key words: Unmanned Aerial Vehicle（UAV）, Self-Screening Jamming（SSJ）, detection probability, miss distance, hit probability

摘要： 研究了单架无人机在突防地空导弹系统的过程中，自卫干扰对无人机敏感性的影响，分析了自卫干扰在敏感性各个环节的作用，仿真分析了平均干扰功率对无人机最小暴露半径、被探测到的概率、脱靶距离及被击中概率的影响。仿真结果表明，使用自卫干扰技术能有效地降低无人机的敏感性，从而提高其作战生存力。研究结果可为无人机敏感性评估、生存力增强措施的研究及雷达探测系统的效能评估提供一定的依据。

关键词: 无人机, 自卫干扰, 探测概率, 脱靶距离, 击中概率