基于ＧＳ（Ｇｒａｍ－Ｓｃｈｍｉｄｔ）正文算法，推导出一个正交基范数阈值，据此阈值可在ＧＳ正交化过程中判定出信号矢量空间的维数，从面实现对信号源个数的检测。在此基础上，利用所获得的正交基构造一个信号矢量空间，并在此空间中定义了一个搜索画数来实现对信号方位的估计。这种方法的优点在于算法简单，运算量小，且特别适于大阵列的测向。计算机模拟结果也显示了本方法的良好检测效果。 Based on the Gram-Schmidt (GS) text algorithm, an orthonormal basis norm threshold is deduced. Based on this threshold, the dimension of the signal vector space can be determined during the orthogonalization of GS, and the number of signal sources can be detected from the surface . On this basis, a signal vector space is constructed by using the obtained orthogonal basis, and a search painting number is defined in the space to realize the signal orientation estimation. The advantage of this method is the simple algorithm, the small amount of computation, and is particularly suitable for large array of DF. Computer simulation results also show the good detection effect of this method.