一种改进的短时数据高精度测频算法  

An improved short time frequency measurement algorithm

作　　者：周泉[1] 陈永游[1] 侯庆禹[1] 任亮[1] 

机构地区：[1]中国航天科工集团8511研究所,江苏南京210007

出　　处：《航天电子对抗》2012年第1期56-59,共4页Aerospace Electronic Warfare

摘　　要：原短时数据高精度测频算法在某些频率范围内无法实现对频率的准确估计,分析了产生这一现象的原因,并提出了一种改进的短时数据高精度测频算法。在低信噪比条件下,改进算法可以实现对采样率范围内所有频率的高精度估计,其性能接近Cramer-Rao(CR)下界。The original short time frequency measurement algorithm is not adequate in some frequency ranges. Aiming at this phenomenon, the reason is analyzed and an improved short time frequency measurement al gorithm is proposed. The improved algorithm can achieve high performance no matter which frequency it is in the range of sampling frequency. Even at low SNR, the performance of the improved algorithm is close to CR.

关 键 词：频率测量 分段累积 CR下界 

分 类 号：TM935.1[电气工程—电力电子与电力传动]