But it is hard to realize the dual-loop instantaneous control with digital scheme, because there is delay time of sampling and computing and lack of real-time regulation for digital control.

数字控制器存在采样与计算延时，实时控制性差，采用数字控制器实现双闭环瞬时值控制比较困难。

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How to select sampling frequency reasonably is an actual problem in designing the real time digital control system.

合理选择采样频率是设计实时数字控制系统遇到的实际问题。

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The multiplication of correlation could be implemented just by pseudo random gating sampling (analog) or data reservation control and rejection (digital).

相关处理乘法可简单地用伪随机门控采样(模拟)或伪随机控制数据保留与剔除(数字)方法实现。

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