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信源数目判断是阵列测向中的重要课题，目前常用的方法一般都不利用信源的入射方向估计信息，称为信源数目的“前”判断方法。由于使用的信息较少，这类方法很难给出信源数目的准确估计。当信源数目估计过少时，将影响测向效果，而过多时则无法去掉虚假信号。为解决该问题，提出了基于投影分解的信源数目“后”判断方法。分析证明了该方法与ＭＵＳＩＣ、极大似然算法配合使用的问题，并进行了计算机模拟。结果表明，该方法有较强的适用性且判断效果较好。
The judgment of the number of sources is an important issue in array direction finding. At present, the commonly used methods generally do not make use of the information of the source to estimate the direction of arrival, which is called the “front” judgment method of the number of sources. Due to the small amount of information used, such methods make it difficult to give an accurate estimate of the number of sources. When the number of sources is estimated to be too small, it will affect the direction finding effect, while too much can not remove the false signal. In order to solve this problem, a method of “post” judgment based on projection decomposition is proposed. The analysis proves the problem of using this method in combination with MUSIC and maximum likelihood algorithm, and carries on the computer simulation. The results show that the method has strong applicability and good judgment.