TA的每日心情 | 开心
2019-11-20 15:05 |
|---|
签到天数: 2 天 [LV.1]初来乍到
|
EDA365欢迎您登录！
您需要 登录 才可以下载或查看，没有帐号？注册
x
低信噪比下相位编码信号载频估计新方法 % Y/ v. \. J' E4 v) R
（电波科学学报2016年第31卷第一期）
+ o6 `3 b# v$ K4 F e+ ]. A1 ?' j/ f# T( v# w
摘要：研究了电子侦察中相位编码信号的载频估计问题，提出一种低信噪比下载频佑计新方法．该 方法首先将相位编码信号划分为等长度的交叠区间，并计算各个区间内信号频谱的聚集性测度，然后采用网 格密度聚类算法对聚集性测度进行分类，以聚类结果作为载频佑计的特征类，最后叠加特征类频谱并提取峰 值得出信号载频佑计值，实验结果表明，该方法无需先验知识，对编码形式不敏感，且能够在较低信噪比下完 成相位编码信号的载频佑计，适合于电子侦察场合。
6 X/ V% Z' ]+ U" t6 j. f. X8 H$ ]" g$ F
) A- i# s# \" Q. ~/ _& J关键词：电子侦察；相位编码；载频估计；低信噪比
{4 a1 j e6 k% f% o1 P' W# d4 @9 g& t" c' b$ w; I& z
Abstract： Carrier frequency blind estimation of phase shift keying(PSK) signals in the electronic re-connaissance is discussed and a novel blind estimation method in iow signal to noise ratio(SNR) is pro-posed. The PSK signal is divided into some overlapping intervals of equal length. The spectral concentra-tion measures of the signal in every interval are calculated based on the Fast Fourier Transform. Then,the grid-density clustering algorithm is adopted to process the spectral concentration measures,and the cluste-ring result is regarded as the characteristic class. Finally,the spectrums of the characteristic class are ac-cumulated to estimate the carrier frequency of the PSK signal. Experimental results shows that the pro-posed method,which can effectively estimate the carrier frequency in iow SNR without any prior knowl-edge and is not sensitive to the coded type,is suitable for electronic reconnaissance occasions. Keywords electronic reconnaissance;phase shift keying;carrier frequency estimation;low SNR .# C3 Z Z, e# ?* M. c
" Y. s; T }7 N9 n% ^# w+ Z* E3 }: F) x5 T$ b8 H' t: ^# M
5 N5 C& ^0 F, \
* N8 Z0 O3 T4 T
; K3 T# x/ n7 j2 W1 E; L |
|
/1 
发表于 2019-10-14 09:49
收藏
淘帖
支持！
反对！