基于CORDIC算法的数字瞬时测频  

Digital instantaneous frequency measurement based on CORDIC algorithm

作　　者：郑斌 蒋碧颖 

机构地区：[1]河海大学计算机与信息学院,南京211100 [2]中国电子科技集团公司第二十八研究所,南京210007

出　　处：《信息技术》2017年第10期129-132,136,共5页Information Technology

摘　　要：数字瞬时测频(DIFM)是现代雷达对抗中的关键技术之一,它要求在极短的时间要完成对输入信号频率的测量。传统的瞬时测频方法是将频率信息转化为相位信息,之后再把相位信息转化为幅度信息,通过对幅度信息的量化编码,从而得到输入信号的频率。文中提出的是基于下变频,CORDIC算法的相位计算和相位推算法的数字瞬时测频方法。CORDIC算法的相位计算避免了乘法器的使用,因此适合实际应用。通过仿真得知,该方法对于单频信号的频率测量精度高,瞬时性好的优点,特别适合现代电子战接收机数字瞬时测频的需求。Digital instantaneous frequency measurement（ DIFM） is one of the key technologies of modern radar countermeasure,it is required to complete the measurement of the frequency of the input signal to be in a very short time. The traditional method of instantaneous frequency measurement is to convert the frequency information into phase information,then the phase information is converted to amplitude information,and the frequency of the input signal is obtained by the quantization of the amplitude information. This paper presents a digital instantaneous frequency measurement method based on the phase calculation of the down conversion,the CORDIC algorithm,and the phase estimation method. The phase calculation of CORDIC algorithm avoids the use of multiplier,so it is suitable for practical application. Through the simulation,it is found that this method has the advantages of high precision and good instantaneous frequency for the single frequency signal,especially is suitable for the digital instantaneous frequency measurement of the modern electronic warfare receiver.

关 键 词：下变频 DDS 数字瞬时测频 CORDIC算法 相位推算 

分 类 号：TN914.42[电子电信—通信与信息系统]