為了獲得二維圖像中目標空間方位信息的同時，保證圖像幀信息同步，采用了一種基于MB90092芯片的字符疊加方法。分析了視頻字符疊加原理，給出了字符疊加電路實現方法，設計了疊加系統主程序流程及中斷子程序流程，研究了各子模塊的功能及工作原理。該疊加模塊應用于某型無人機信息系統，疊加系統工作正常，疊加圖像質量較好，能夠滿足系統獲取相關信息的需求。

　　Abstract:

　　In order to obtain the target orientation information in 2D image and ensure synchronization of frame information， a character addition method based on MB90092 is adopted. This paper analyzed video-character addition principle， presented the method which could realize character addition circuit， designed its main program flow and interrupt subprogram flow， and had a research on the function and work principle of submodules. The addition module has applied to certain UAV information system， and the result shows that the system works well， quality of the addition image is preferable， and it can get relevant information in need.

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