低信噪比条件下正弦信号幅度盲估计  

Blind amplitude estimation of sinusoid at low signal to noise ration

作　　者：胡国兵[1,2] 徐立中[1] 吴珊珊[2] 金明[2] 

机构地区：[1]河海大学计算机与信息学院,南京210098 [2]南京信息职业技术学院电子信息学院,南京210046

出　　处：《计算机工程与应用》2013年第16期205-208,共4页Computer Engineering and Applications

基　　金：2011江苏省自然科学基金资助(No.BK2011837)

摘　　要：研究了电子侦察信号处理中正弦信号幅度盲估计问题。提出了一种基于相关累加及线性回归的正弦信号幅度盲估计算法。先对接收到的信号进行频率估计,建立参考信号,将接收信号与参考信号相关后变换到基带并作累加,后将相关累加曲线进行最小二乘线性回归,以回归得到的直线斜率值作为信号幅度的估计值。仿真结果表明,当信噪比大于-3 dB时,方法的估计均方根误差小于1.1倍克拉美罗限,可在低信噪比条件下,实现正弦信号幅度的盲估计。Amplitude estimation of the sinusoid signals contaminated by noises in the electronic reconnaissance is researched in this article. A new blind amplitude estimator of sinusoid is proposed based on correlation and linear regression. The received sig- nals are transformed to baseband by the reference signals constructed by the estimation of the frequency. Consequently, the gradi- ent of the linear regression of correlation and accumulation curve between the received signals and the referenced ones is regard- ed as the amplitude estimator. Computer simulation results show that the root-mean-square error of the estimator is less than 1.1 times CRLB when the signal to noise ratio is greater than - 3 dB and the proposed estimating method is an efficient blind estima- tion for the amplitude of the sinusoid on the condition of low signal to noise ratio.

关 键 词：正弦信号 幅度估计 相关累加 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]