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。%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.
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