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Radio tracking is widely used in communication technology because it can determine the coordinate position of radio transmitter and the distance of rocket to the ground station in a similar manner toradar system. this paper describes a method of azimuth angle detection of transmitter based on doppler circullar array antenna. the difference of signal powerwhen the antenna is switched rapidly, is used to calculate the horizontal/azimuth angle from the radio transmitter. The results of the calculation is quite accurate only when the wave source is settled, so further research is needed to more accurately both the state still or moving object. This instrument will support rocket tracking systems.