Spectrum perception method for detecting angle of arrival of authorized user in cognitive radio

The invention discloses a spectrum perception method for detecting the angle of arrival of an authorized user in cognitive radio, and relates to a spectrum perception method in a cognitive radio system, in particular to a method capable of detecting the signal and the angle of arrival of the authorized user. The method comprises the following steps that: a linear array antenna system receives the signal; the spatial spectrum of the signal is obtained through multiple signal classification algorithm; the statistical average of the spatial spectrum Lambda serves as judgment reference; the threshold Gamma which meets false alarm probability Pf is obtained through a test; Lambda and threshold Gamma are compared to judge if the authorized user exists; and if the authorized user exists, the angle of arrival of the authorized user is obtained through minimum optimization searching. The method for detecting the multi-dimensional information of the authorized use provides conditions for further flexibly applying the frequency band of the authorized user.