The Interrogation Side Lobe Suppression(ISLS)technique applied in Secondary Surveillance Radar (SSR)system is analyzed. Generally,even if ISLS technique is adopted,however,transponder replies can not be prevented completely and the coverage of interrogation in azimuth can not be adjusted automatically. In view of these shortcomings,a new design is proposed. In the design,interrogation signal is radiated from sum(Σ), difference(Δ),omni-directional(Ω)channels to eliminate the interference of side lobe. Beam control factor is carried in interrogation signal to realize automatic control of efficient beam width in azimuth of interrogator anten-na. The design improves the abilities of side lobe suppression,anti-jamming,and platform applicability of SSR system. The design has been successfully applied in a project.% 分析了二次雷达系统中采用的询问旁瓣抑制(ISLS)技术，针对其不能完全消除询问旁瓣干扰、无法调节询问方位覆盖范围的不足，提出了一种新的设计方案，采用和(Σ)、差(Δ)、全向(Ω)三通道发射询问信号的方法来消除旁瓣干扰，并通过采用询问信号传递波束调节因子的方法实现系统询问有效方位波束宽度的自动调节。该方案提高了系统的询问旁瓣抑制能力、抗干扰能力和平台适应性，已成功应用于某工程。
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