中文摘要：

在阵列信号处理领域，信号源数的估计是一个重要问题。EIT方法有着良好的检测性能，但对不等强目标检测时性能严重下降。因此提出一种改进的峰均功率比判源方法，利用特征向量对接收数据进行加权，然后计算其峰均功率比，通过利用特征值与峰均功率比值在区分噪声和信号方面的一致性，引入一个递归过程，检测信号源个数。仿真结果显示，采用此方法不受目标强度差的影响，对不等强双目标有优良的检测性能。

英文摘要：

Estimation of the number of sources is an important issue in array signal processing. EIT is a well-known excel-lent method for source number detection. However,the detection capacity of this method is weak while the intensity of sources is quite different. A modified peak-to-average power ratio method is proposed in this paper. The eigenvector is employed to weigh the received data and calculate the peak-to-average power ratio,then according to the fact that both the eigenvalues and the peak-to-average power ratio have valuable information in distinguish signal and noise,the source number is detected by introducing a recursive procedure. The simulation results show that the method is efficient,and does not be influenced by the intensity differ-ence between the targets,and has good performance when the target intensity is unequal.