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本文从系统设计、电路设计和结构设计三个方面,全面地阐述了运载火箭测试发控系统的抗干扰设计方法,电路设计和结构设计紧紧围绕数据采集子系统的A/D转换器来论述。文中推导了积分式A/D转换器的转换方程及其抗干扰的数学表达式,并指出如何利用这一表达式来选择参数使之获得最佳抗常态干扰的能力。最后一部分,阐述了抗共态干扰的结构设计方法,推导了抗共态干扰能力与结构分布参数之间的数学表达式,从而指导着“输入浮地双层屏蔽结构”设计的目标。这些方法对于数据采集通道以外的其它通道也是有效的。作者使用这些方法,在一些大系统设计中获得了满意的效果。
This article elaborates the anti-jamming design method of the test and control system of the launch vehicle comprehensively from three aspects of system design, circuit design and structure design. The circuit design and structure design focus on the A / D converter of the data acquisition subsystem . In this paper, the conversion equation of integrated A / D converter and the mathematical expression of its anti-interference are deduced, and how to use this expression to select the parameters to get the best anti-normal interference ability is pointed out. In the last part, the structural design method of anti-common-state interference is expounded, and the mathematical expression between anti-common-mode interference ability and structural distribution parameter is deduced, which guides the design goal of “input floating double-layer shield structure”. These methods are also valid for other channels than data acquisition channels. Using these methods, the author has achieved satisfactory results in some large-scale system designs.