闪电VHF辐射相位干涉测向系统的数字化实现  

Digital realization of VHF phase interferometer direction determination system for thunder lightning signal

作　　者：杨瑞强[1,2] 蔡跃荣[1] 叶依众[1] 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《电子测量技术》2010年第4期12-15,共4页Electronic Measurement Technology

摘　　要：VHF相位干涉仪在辐射信号探测方面有着广泛地应用,介绍了基于FPGA的VHF相位干涉测向系统,用于高速闪电波形数据的采集与测向,本系统采用数字复解调技术取代传统的模拟方式实现的VHF相位干涉仪,极大提高了系统的运算精度和抗噪声性能,并且可以实时改变接收频点。详细讨论了数字复解调技术的原理以及在FPGA上的实现,最后给出了测试结果,验证了系统的性能。VHF phase interferometer system has a wide range of application in radiation signal detection.In this paper,a VHF phase interferometer direction determination system based on FPGA is presented.The system adopts digital IQ demodulation instead of traditional analog technology,which greatly improve the computing precision and anti-noise performance of the whole system.The system can change the demodulation frequency real-time.The implementation of digital IQ demodulation in FPGA is discussed in detail,the test results are presented in the end,which verify the performance of the system.

关 键 词：相位干涉 闪电探测 FPGA 

分 类 号：TN911.72[电子电信—通信与信息系统]