云闪定位系统中的数字AGC设计  

Design of Digital AGC in Cloud Lightning Location System

作　　者：卢舟[1,2] 孙秀斌[1,2] 唐昕瑜 肖坤峰 

机构地区：[1]成都信息工程大学电子工程学院,四川成都610225 [2]中国气象局大气探测重点开放实验室,四川成都610225 [3]成都傅立叶电子科技有限公司,四川成都610045

出　　处：《仪表技术与传感器》2015年第8期96-99,共4页Instrument Technique and Sensor

基　　金：四川省教育厅成果转化重大培育项目(13CZ0011)

摘　　要：在云闪定位系统中,天线接收的闪电辐射源信号会因为云闪与天线的距离、闪电电磁辐射的强弱等因素而不稳定。为了使系统接收到的电磁辐射信号保持在一定动态范围内,本文介绍了一种基于FPGA和数控衰减器的数字AGC系统,给出了硬件电路总体设计方案以及各部分电路的设计方法,并且详细介绍了基于切比雪夫逼近法的数字AGC功率估计算法以及AGC算法实现流程。该设计方案实现了对云闪信号的数字自动增益控制,为云闪定位系统中的数控AGC工程实现提供了一种切实可行的方案。In cloud lightning location system, the distance between cloud flash and antenna, the strength of the electromagnet- ic radiation and other factors can make the lightning radiation signals received by antenna instability. In order to make the electro- magnetic radiation signals received by system maintained in a certain dynamic range, a kind of digital AGC system based on FPGA and digital attenuator was introduced, the overall design scheme of the hardware circuit and the design method of each part of the circuit were given, and the algorithm of digital AGC power estimation based on Chebyshev approximation method and the AGC algorithm implementation process were introduced in detail. The control of the cloud flash signal digital automatic gain was realized, thus providing a feasible scheme for digital AGC engineering implementation in cloud lightning location system.

关 键 词：云闪定位 数字自动增益控制 切比雪夫多项式 FPGA AD9446 

分 类 号：TN911.7[电子电信—通信与信息系统]