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本文介绍利用“观测器”设计数字滤波网络的方法。本方法是先给出系统要求的闭环对象极点位置,然后求得满足系统特性的数字滤波网络;而惯用的对数频率法则是基于系统的开环对数频率特性,凭借设计者的经验选取某个网络,用工程作图法使系统特性去逼近希望的理想特性。显然,前者依赖于数字模拟计算,着重考虑网络的数字计算机实现;而后者则取决于设计者的经验,着重考虑网络的物理实现。 另外,本方法对问题的描述采用了状态表示法和矩阵矢量形式,便于数字网络设计的数值计算程序化,因而也就便于修改设计或跨型号的重新设计。
This article describes the use of “observers” to design digital filtering networks. The method firstly gives the pole position of the closed-loop object required by the system and then obtains the digital filter network that satisfies the system characteristics. The usual logarithm frequency law is based on the open-loop logarithm frequency characteristic of the system. By virtue of the designer’s experience, A network that uses engineering mapping to approach the desired characteristics of the system’s characteristics. Obviously, the former relies on digital simulation, with emphasis on digital computer implementation of the network; the latter, depending on the designer’s experience, focuses on the physical realization of the network. In addition, this method uses the state representation and matrix vector to describe the problem, which facilitates the numerical calculation of digital network design and thus facilitates the redesign of the design or cross-model.