Method and device of estimating space arrival direction

The present invention discloses an estimation method and device of space arrival direction used in wireless communication system which applies the technique of intelligent antenna; an up-link time slot M and a renewal cycle T included in the calibration cycle are set; a time slot comprises one or more than one renewal cycle T; when the DOA estimation of space arrival direction is started, the counting unit calculates the up-link time slot in the calibration cycle and the renewal cycle in every up-link time slot; the calculation is carried out by a controller, based on the above calculating value, in the first renewal cycle of the first time slot of every calibration cycle, activating the searching machine of maximum power value to work out the DOA calibration value which is considered as the primary value or calibration value of DOA calibration; in other time of the calibration cycle, activating the arbiter of optimal demodulation signal to work out the DOA calibration value, realizing the follow of the DOA calibration value; the selector of DOA output value chooses the final DOA calibration value. The invention can lessen the complicated matrix manipulation, providing a much precise DOA calibration value.