一种基于滑动滤波的数字AGC应用

An Application of DAGC Based on Flip Filtering

阐述了一种基于滑动滤波的数字自动增益控制(DAGC)的实现方法,采用数字下变频(DDC)后数据的模值作为样本数据,运用滑动滤波算法,计算反馈控制量(功率衰减量),作用于中频接收机数控衰减器,控制接收通道增益,使DDC后数据模值稳定在期望值。由于采用了滑动滤波算法,所以便于工程实现,且在指标范围内实现效率高。

This paper expatiates a method to realize digital automatic gain control（DAGC） based on slip filtering,which uses the module value after digital down-conversion （DDC） as sample data,and uses flip-filtering algorithm to calculate the feedback control quantity （power attenuation quantity）. The quantity acts on digital control attenuator of intermediate frequency receiver to control the gain of reception channel,makes the data module value after DDC steady at a desired value. Because of using the slip filtering algorithm,the method is easily realized in engineering and has high realization efficiency in the index scope.