通信信号的高精度测频

Precise Measurement of the Frequency of Communications Signals

在跳频通信及其它调制方式通信中 ,关键技术之一就是提高测频的精度与速度。用DFT测量载频时 ,测频精度是 1 / 2N ,N为DFT的序列点数 ,要想提高测频精度只有提高DFT的运算点数 ,这样就增加运算量。本文提出了一种修正算法 ,在运算点数不变的情况下 ,利用修正算法 ,提高测频精度 1 0～ 1 0 0倍 ,运算量并不增加。

It is very important to improve the precision of frequency measurement in communications reconnaissance and antagonism.The precision of frequency is 1/2N by use of DFT.N is the number of signal sequence.One way to improve the precision of frequency is to increase the number of signal sequence.As a result the number of operations will increase.This paper brings forward the correct arithmetic,which can improve the precision up to 10～100 times in same number of signal sequence,but the number of operations will not increase.