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Detection of the directions of arrival (DOA) and the number of impinging signals is an essential function in many array antenna beamforming techniques. A new approach is presented here for estimating the DOA and the number of desired signals in array antennas. The new algorithm exploits the cyclostationarity of the modulated signals, which are disturbed by unknown interferences and noises, to suppress undesired signals. In this approach, the outputs of antenna sensors are applied to a linear prediction model and the cyclic correlation is calculated to utilize the cyclostationarity of the desired signals. Also the error of estimation of the cyclic correlation function in the linear prediction model is evaluated and the DOA of the desired signals is correctly estimated. Results are compared with the results of conventional approaches, such as cyclic MUSIC, in the presence of interference and at low signal-to-noise ratios. Numerical examples are presented to show the effectiveness of the proposed method. © 1999 Scripta Technica, Electron Comm Jpn Pt 1, 82(10): 29–39, 1999 [ABSTRACT FROM AUTHOR]