一种基于FPGA的并行结构瞬时测频方法

摘要

针对捷变频雷达信号的数字测频存在数据处理量大、实时性要求高的问题,介绍了一种基于正交混频、滤波抽取和瞬时自相关算法的并行结构测频方法.通过将正交混频本振频率设为采样频率的四分之一,减少了正交混频模块和滤波模块的FPGA资源消耗.测试结果表明该测频算法的数据处理能力、实时性及测频精度能够满足雷达目标模拟器的测频需求.%In order to solve the problems that the digital frequency measurement of frequency agile radar signal has a large data processing capacity and high real-time requirement,a method of instantaneous frequency measurement based on orthogonal mixing,filtering extraction and instantaneous correlation with parallel architecture is introduced.By setting the frequency of orthogonal mixing to a quarter of the sampling frequency,the FPGA resource consumption of orthogonal mixing and decimation filter is reduced.The results prove that the frequency measurement algorithm has strong processing capability and real-time,and high frequency measurement accuracy,which can meet the needs of radar target simulator.