Abstract: 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 signals are transformed to baseband by the reference signals constructed by the estimation of the frequency. Consequently, the gradient of the linear regression of correlation and accumulation curve between the received signals and the referenced ones is regarded 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 estimation for the amplitude of the sinusoid on the condition of low signal to noise ratio.

Key words: sinusoid, amplitude estimator, correlation and accumulation

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。

关键词: 正弦信号, 幅度估计, 相关累加