一种基于FPGA的宽带瞬时高精度测频算法  

An Broadband Instantaneous Frequency Measurement Algorithm with High Accuracy Based on FPGA

作　　者：李宏圆[1] 王坤达[1] 黎仁刚[1] 

机构地区：[1]中国船舶重工集团公司第723研究所,扬州225001

出　　处：《舰船电子对抗》2014年第5期14-17,22,共5页Shipboard Electronic Countermeasure

摘　　要：在现代电子对抗领域中,单比特接收机具有瞬时带宽大、处理实时、灵敏度高等优点,在瞬时测频领域中发挥着重要的作用。分析了单比特接收机的原理,阐述了基于基4快速傅里叶变换(FFT)的现场可编程门阵列(FPGA)设计以及Rife频率逼近算法,提出了一种改进的宽带瞬时高精度测频算法。仿真结果表明了该算法的有效性,相比现有的算法,本文所提的算法在灵敏度与测频精度上均有所改进。In the modern electronic countermeasure domain, the mono-bit receiver has advantages such as large instantaneous bandwidth,real-time processing and high sensitivity, etc. , plays an im- portant role in the field of instantaneous frequency measurement. This paper analyzes the principle of mono-bit receiver,expatiates the field programmable gate array （FPGA） design based on radix-4 fast Fourier transform （FFT） algorithm and Rife frequency approximate algorithm,brings forward an improved broadband instantaneous frequency measurement algorithm with high accuracy. The simulation results show that proposed algorithm is efficient. Compared with the existing algo- rithms,the proposed algorithm is superior in the sensitivity and accuracy of frequency measure- ment.

关 键 词：单比特接收机 Rife算法 快速傅里叶变换 现场可编程门阵列 

分 类 号：TN971.1[电子电信—信号与信息处理]