基于SoC的无人机航测视频信息叠加设计与实现

Design and Implementation of Superposition for UAV Video Based on SoC

采用无人机航测平台标校光学助降系统光学下滑道指示角度时,需要确定无人机航拍穿越光学下滑道时刻航测相机镜头成像中心位置;首先需要获取无人机标校平台航测相机视频帧成像瞬时的精确时间,然后根据成像时刻GPS天线相位中心的坐标,结合无人机平台的姿态信息通过坐标转换得到拍照时刻航测相机镜头几何中心的坐标;文章设计并实现了一种基于SoC的无人机航测视频信息叠加方法,时间同步精度优于30ms,充分利用SoC内的嵌入式ARM核和媒体处理平台资源,ARM核心处理器的主要功能是完成与外设的通信及控制,专用的媒体处理平台完成音视频解码,采用SoC专用解码芯片的方案具有开发灵活和集成度高等优点。

When using the UAV aerial survey platform to calibrate the optical glide path indicating angle of the optical assist system, it is necessary to determine the imaging center position of the aerial camera lens when the drone aerial photography passes through the optical glide path.Firstly,it is necessary to obtain the precise imaging time of the video frame of the aerial camera of the UAV calibration platform.Then,according to the coordinates of the phase center of the GPS antenna at the imaging time,combined with the attitude information of the UAV platform,the coordinate of the geometric center of the camera lens is obtained by coordinate transformation.In this paper,a video information superposition method based on SoC has been designed and implemented,which making full use of embedded ARM core and media processing platform resources in SoC.The time synchronization accuracy of video frames is better than 30ms.The main function of the ARM core processor is to complete communication,and control with peripherals, and the audio and video decoding are completed by the dedicated media processing platform.The scheme using SoC special decoder chip has the advantages of flexible development and high integration.