A switch guidance law was designed based on the existing study result on infrared imaging missile multimode guidance technique, and is fit for infrared imaging seeker. The different phase' s imaging characteristics of infrared imaging seeker were analyzed. Guidance laws were selected based on analysis, and can make up the defects of infrared imaging seeker. With trajectory shift algorithm, the guidance laws can achieve guidance function. Simulation result was that when the switch guidance law was used against high maneuvering targets, the miss distance was less and the trajectory was smoother than that in the case of proportional guidance law. The result indicates that three of the switch guidance law have simple framework, and the trajectory shift algorithm needs little workload, which fit the switch guidance law for engineering application.%根据对红外成像导弹多模制导技术研究的现有成果,设计了适合红外成像导引头的制导律.分析了红外成像导引头不同阶段的成像特点,根据这些特点选择相应的制导律.这些制导律很好地弥补了红外成像导引头的成像缺点,并结合弹道交接算法完成制导功能.数字仿真验证了切换制导控制导弹攻击大机动目标较比例导引有更小的脱靶量和更平滑的弹道.结果表明,切换制导律所用的三种制导律结构简单,其弹道交接算法工作量小,这些都利于这一技术的工程应用.
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