已调制信号计算其普相关密度，ML法能够很好的估计信号的信噪比,直线阵采用切比学夫加权控制主旁瓣比。- Modulated signals to calculate its density Pu-related, ML estimation method can be a good signal to noise ratio, Linear array using cut than learning laid upon the right control of the main sidelobe ratio.